Your Local Water Profile: Arcadia
This profile explains what the applicable water provider reported for Arcadia, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
First, confirm your water provider.
This city includes address-dependent or partial water-service coverage. Confirm the provider on your bill before using these results.
What the official water report says
Your water at a glance
City of Arcadia
The report lists hardness as 210 mg/l; this is very hard on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
San Gabriel Valley Water Company
The report lists hardness as 236.16 ppm; this is very hard on the USGS scale.
Reported range: 90.84 - 355.00 ppm
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
California American Water
The report lists hardness as 89 mg/L; this is moderately hard on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
Golden State Water Company
The report lists hardness as 160 mg/L as CaCO3; this is hard on the USGS scale.
USGS hardness scale: 0–60 soft; 61–120 moderately hard; 121–180 hard; >180 very hard, in mg/L as CaCO3.
City of Arcadia — compliance, as reported
The report states: “The drinking water provided by the City of Arcadia in 2025 complies with all Federal and State drinking water standards”
Violations or advisories, as reported: No violations were reported. The report states that the drinking water provided by the City of Arcadia in 2025 complies with all Federal and State drinking water standards.
San Gabriel Valley Water Company — compliance, as reported
The report states: “The water supplied by San Gabriel Valley Water Company complies with all state and federal safe drinking water standards and regulations.”
Violations or advisories, as reported: During 2018-2019 thirty schools were tested for lead. Of the thirty schools tested, 2 schools exceeded the action level of 15 ppb. One school was resampled with confirmation results below the action level and one school took the source out of service. No further action was required.
California American Water - East Pasadena — compliance, as reported
The report states: “We are pleased to report that in 2025, your water met state and federal drinking water requirements. [p. 2]”
Violations or advisories, as reported: Chromium Hexavalent was detected at levels that exceed the MCL. While a water system of our size is not considered in Violation of the Chromium Hexavalent MCL until after October 2027, we are working to address this exceedance & comply with the MCL. Specifically, we are planning to build a treatment system to meet regulatory requirements.
South Arcadia Water System — compliance, as reported
The report states: “We are proud to report that the water delivered to your tap complies with all applicable regulatory requirements. [p. 2]”
Violations or advisories, as reported: Total Coliform Bacteria: More than 5% of monthly samples were present for total coliform in July. Level 1 assessment was triggered. Although Level 1 assessment was triggered, the system was in compliance. (p. 9) PFAS: In 2025, GSWC sampled groundwater sources in the South Arcadia System for PFAS. Some sources had detections above the current notification levels. Notification letters were sent out to all local governing bodies, State Water Resources Control Board’s Division of Drinking Water and California Public Utilities Commission. (p. 9)
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
City of Arcadia
Hardness as CaCO3
The utility reported: 210 mg/l
Reported constituent · report p. PAGE 4 · official report
Specific Conductance
The utility reported: 530 µmho/cm
Reported constituent · report p. PAGE 4 · official report
Total Dissolved Solids
The utility reported: 330 mg/l
Reported constituent · report p. PAGE 4 · official report
Odor
The utility reported: Not detected at the report's stated reporting limit threshold odor number
Reported constituent · report p. PAGE 4 · official report
Total Trihalomethanes (TTHM)
The utility reported: 11 µg/l
Reported constituent · report p. PAGE 4 · official report
Haloacetic acids (five) (HAA5)
The utility reported: 2 µg/l
Reported constituent · report p. PAGE 4 · official report
Hexavalent Chromium
The utility reported: 3.0 µg/l
Reported constituent · report p. PAGE 4 · official report
San Gabriel Valley Water Company
Alkalinity (CaCO3)
The utility reported: 196.56 ppm
Reported range: 140.00 - 290.00
Reported constituent · report p. 6 · official report
Alkalinity (CaCO3) (Purchased Surface Water)
The utility reported: 110 ppm
Reported range: 95.00 - 124.00
Reported constituent · report p. 6 · official report
Calcium
The utility reported: 70.54 ppm
Reported range: 30.30 - 107.00
Reported constituent · report p. 6 · official report
Calcium (Purchased Surface Water)
The utility reported: 56 ppm
Reported range: 43.00 - 70.00
Reported constituent · report p. 6 · official report
Hardness (CaCO3)
The utility reported: 236.16 ppm
Reported range: 90.84 - 355.00
Reported constituent · report p. 6 · official report
Hardness (CaCO3) (Purchased Surface Water)
The utility reported: 234 ppm
Reported range: 189.00 - 280.00
Reported constituent · report p. 6 · official report
pH
The utility reported: 7.74 units
Reported range: 7.36 - 8.04
Reported constituent · report p. 6 · official report
pH (Purchased Surface Water)
The utility reported: 8.2 units
Reported range: 8.20 - 8.30
Reported constituent · report p. 6 · official report
Potassium
The utility reported: 3.04 ppm
Reported range: 1.10 - 5.40
Reported constituent · report p. 6 · official report
Potassium (Purchased Surface Water)
The utility reported: 4.4 ppm
Reported range: 3.80 - 5.00
Reported constituent · report p. 6 · official report
Sodium
The utility reported: 35.23 ppm
Reported range: 10.00 - 82.00
Reported constituent · report p. 6 · official report
Sodium (Purchased Surface Water)
The utility reported: 89 ppm
Reported range: 78.00 - 100.00
Reported constituent · report p. 6 · official report
Chloride
The utility reported: 37.5 ppm
Reported range: 4.20 - 110.00
Reported constituent · report p. 5 · official report
Chloride (Purchased Surface Water)
The utility reported: 92 ppm
Reported range: 86.00 - 98.00
Reported constituent · report p. 5 · official report
Iron
The utility reported: 24.56 ppb
Reported range: ND - 270.00
Reported constituent · report p. 5 · official report
Iron (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Reported constituent · report p. 5 · official report
Manganese
The utility reported: <0.40 ppb
Reported range: ND - 2.30
Reported constituent · report p. 5 · official report
Manganese (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Reported constituent · report p. 5 · official report
Specific Conductance
The utility reported: 603.87 uS/cm
Reported range: 310.00 - 900.00
Reported constituent · report p. 5 · official report
Specific Conductance (Purchased Surface Water)
The utility reported: 868 uS/cm
Reported range: 754.00 - 981.00
Reported constituent · report p. 5 · official report
Sulfate
The utility reported: 61.37 ppm
Reported range: 21.00 - 150.00
Reported constituent · report p. 5 · official report
Sulfate (Purchased Surface Water)
The utility reported: 176 ppm
Reported range: 139.00 - 212.00
Reported constituent · report p. 5 · official report
Total Dissolved Solids
The utility reported: 350.1 ppm
Reported range: 190.00 - 570.00
Reported constituent · report p. 5 · official report
Total Dissolved Solids (Purchased Surface Water)
The utility reported: 536 ppm
Reported range: 456.00 - 617.00
Reported constituent · report p. 5 · official report
Turbidity
The utility reported: 0.11 NTU
Reported range: ND - 0.45
Reported constituent · report p. 5 · official report
Turbidity (Purchased Surface Water)
The utility reported: 0.11 NTU
Reported range: ND - 0.75
Reported constituent · report p. 5 · official report
Chlorine Residual
The utility reported: 1.3 ppm
Reported range: 0.78 - 1.70
Reported constituent · report p. 7 · official report
Chlorine Residual (Purchased Surface Water)
The utility reported: 2.41 ppm
Reported range: 1.12 - 3.00
Reported constituent · report p. 7 · official report
California American Water - East Pasadena
Total Hardness (as CaCO3)
The utility reported: 89 mg/L
OTHER SUBSTANCES OF INTEREST · report p. 6 · official report
Alkalinity as CaCO3
The utility reported: 190 ppm
OTHER SUBSTANCES OF INTEREST · report p. 6 · official report
Total Dissolved Solids
The utility reported: 180 ppm
SECONDARY REGULATED SUBSTANCES · report p. 6 · official report
Copper
The utility reported: 0.198 ppm
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Chlorine
The utility reported: 1.06 ppm
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 4 · official report
South Arcadia Water System
Total Dissolved Solids
The utility reported: 230 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Chloride
The utility reported: 13 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Lead 90th percentile
The utility reported: Not detected at the report's stated reporting limit µg/L
Lead sampling in schools and residential plumbing · report p. 9 · official report
Copper 90th percentile
The utility reported: 0.28 mg/L
Inorganic Constituents · report p. 9 · official report
Chlorine
The utility reported: 1.4 mg/L
Disinfection Byproducts and Disinfectant Residuals · report p. 9 · official report
The Three C's — 2 of 3
Contaminants
What was reported, and what do the applicable standards mean?
Legal limit — maximum contaminant level (MCL)
The highest level legally allowed in public drinking water under the applicable rule. Do not use MCL as a generic label for goals, action levels, notification levels, or independent guidelines. It is different from a non-enforceable health goal.
California health goal — public health goal (PHG)
A non-enforceable health-protective target developed for standard-setting context. It is not the California legal limit.
Federal health goal — maximum contaminant level goal (MCLG)
A non-enforceable EPA public-health target used in setting standards. It is not the legal limit.
Legal disinfectant-residual limit — maximum residual disinfectant level (MRDL)
The highest level of a drinking-water disinfectant allowed under the applicable rule. It is not an MCL for a contaminant.
City of Arcadia — regulated contaminants reported as detected (11)
Total Trihalomethanes (TTHM)
The utility reported: 11 µg/l
Reported range: 3.6 - 14
Benchmark: 80 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water chlorination
Reported constituent · report p. PAGE 4 · official report
Haloacetic acids (five) (HAA5)
The utility reported: 2 µg/l
Reported range: ND - 3
Benchmark: 60 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Reported constituent · report p. PAGE 4 · official report
Chlorine Residual
The utility reported: 0.96 mg/l
Reported range: 0.19 - 1.6
Benchmark: [4] · Health goal (goal): [4] — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant
Reported constituent · report p. PAGE 4 · official report
Arsenic
The utility reported: <2 µg/l
Reported range: ND - 6.4
Benchmark: 10 · Health goal (goal): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 4 · official report
Fluoride, Naturally-occuring
The utility reported: 0.56 mg/l
Reported range: 0.28 - 1.2
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 4 · official report
Hexavalent Chromium
The utility reported: 3.0 µg/l
Reported range: 0.56 - 9.0
Benchmark: 10 · Health goal (goal): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 4 · official report
Nitrate as N
The utility reported: 1.9 mg/l
Reported range: 0.83 - 4.4
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use
Reported constituent · report p. PAGE 4 · official report
Perchlorate
The utility reported: <1 µg/l
Reported range: ND - 2.2
Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharge from industrial activities
Reported constituent · report p. PAGE 4 · official report
Uranium
The utility reported: 2.5 pCi/l
Reported range: ND - 5.2
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. PAGE 4 · official report
Copper
The utility reported: 0.29 mg/l
Reported range: ND - 0.85
Benchmark: 1.3 · Health goal (goal): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing system
Reported constituent · report p. PAGE 4 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit µg/l
Reported range: ND
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing system
Reported constituent · report p. PAGE 4 · official report
City of Arcadia — unregulated monitoring and secondary (aesthetic) records (13)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Chloride
The utility reported: 31 mg/l
Reported range: 8.9 - 55
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Iron
The utility reported: 8.6 µg/l
Reported range: ND - 43
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Odor
The utility reported: Not detected at the report's stated reporting limit threshold odor number
Reported range: ND - 1
Typical source, per the report: Naturally-occuring organic materials
Reported constituent · report p. PAGE 4 · official report
Sulfate
The utility reported: 54 mg/l
Reported range: 18 - 100
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Specific Conductance
The utility reported: 530 µmho/cm
Reported range: 310 - 810
Typical source, per the report: Substances that form ions in water
Reported constituent · report p. PAGE 4 · official report
Total Dissolved Solids
The utility reported: 330 mg/l
Reported range: 180 - 490
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Turbidity
The utility reported: 0.22 NTU
Reported range: 0.10 - 0.30
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Hardness as CaCO3
The utility reported: 210 mg/l
Reported range: 23 - 340
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Perfluorohexane Sulfonic Acid (PFHxS)
The utility reported: <3 ng/l
Reported range: ND - 2.5
Typical source, per the report: Discharge from industrial activities
Reported constituent · report p. PAGE 4 · official report
Perfluorooctane Sulfonic Acid (PFOS)
The utility reported: 7.6 ng/l
Reported range: ND - 8.4
Typical source, per the report: Discharge from industrial activities
Reported constituent · report p. PAGE 4 · official report
Perfluorooctanoic Acid (PFOA)
The utility reported: <4 ng/l
Reported range: ND - 3.8
Typical source, per the report: Discharge from industrial activities
Reported constituent · report p. PAGE 4 · official report
Sodium
The utility reported: 29 mg/l
Reported range: 17 - 53
Typical source, per the report: Runoff/leaching from natural deposits
Reported constituent · report p. PAGE 4 · official report
Perfluorooctane Sulfonic Acid (PFOS) (Entry Points)
The utility reported: <4 ng/l
Reported range: ND - 10
Typical source, per the report: Discharge from industrial activities
Reported constituent · report p. PAGE 4 · official report
San Gabriel Valley Water Company — regulated contaminants reported as detected (31)
Total Coliform Bacteria
The utility reported: 0.51% Highest Percentage of Positive Samples Collected
Benchmark: 5%
Violation per report: No
Typical source, per the report: Naturally present in the environment
Reported constituent · report p. 4 · official report
Total Coliform Bacteria (Purchased Surface Water)
The utility reported: 0.00% Highest Percentage of Positive Samples Collected
Benchmark: 5%
Violation per report: No
Typical source, per the report: Naturally present in the environment
Reported constituent · report p. 4 · official report
Fecal Coliform and E. coli
The utility reported: 0.00% Highest Percentage of Positive Samples Collected
Benchmark: 0.00%
Violation per report: No
Typical source, per the report: Human and animal fecal waste
Reported constituent · report p. 4 · official report
Fecal Coliform and E. coli (Purchased Surface Water)
The utility reported: 0.00% Highest Percentage of Positive Samples Collected
Benchmark: 0.00%
Violation per report: No
Typical source, per the report: Human and animal fecal waste
Reported constituent · report p. 4 · official report
Gross Alpha
The utility reported: 2.05 pCi/L
Reported range: ND - 7.66
Benchmark: 15
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. 4 · official report
Gross Beta
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5.00
Benchmark: 50
Violation per report: No
Typical source, per the report: Decay of natural and man-made deposits
Reported constituent · report p. 4 · official report
Radium 228
The utility reported: 0.04 pCi/L
Reported range: ND - 1.10
Benchmark: 5 · Health goal (goal): 0.019 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. 4 · official report
Uranium
The utility reported: 2.96 pCi/L
Reported range: ND - 11.00
Benchmark: 20 · Health goal (goal): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. 4 · official report
Aluminum
The utility reported: 8.82 ppb
Reported range: ND - 120.00
Benchmark: 1000 · Health goal (goal): 600 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; residue from some surface water treatment processes
Reported constituent · report p. 4 · official report
Aluminum (Purchased Surface Water)
The utility reported: 96 ppb
Reported range: ND - 100.00
Benchmark: 1000 · Health goal (goal): 600 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; residue from some surface water treatment processes
Reported constituent · report p. 4 · official report
Arsenic
The utility reported: 1.6 ppb
Reported range: ND - 5.40
Benchmark: 10 · Health goal (goal): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; runoff from orchards; glass and electronics production wastes
Reported constituent · report p. 4 · official report
Barium
The utility reported: 54.37 ppb
Reported range: ND - 210.00
Benchmark: 1,000 · Health goal (goal): 2,000 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharges of oil drilling wastes and from metal refineries; erosion of natural deposits
Reported constituent · report p. 4 · official report
Fluoride
The utility reported: 0.38 ppm
Reported range: ND - 0.94
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
Reported constituent · report p. 4 · official report
Fluoride (Purchased Surface Water)
The utility reported: 0.7 ppm
Reported range: 0.50 - 0.80
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
Reported constituent · report p. 4 · official report
Hexavalent Chromium
The utility reported: 3.17 ppb
Reported range: 0.51 - 6.20
Benchmark: 10 · Health goal (goal): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; transformation of naturally occurring trivalent chromium to hexavalent chromium by natural processes and human activities; discharges from electroplating factories, leather tanneries, wood preservation, chemical synthesis, refractory production, and textile manufacturing facilities.
Reported constituent · report p. 5 · official report
Hexavalent Chromium (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Benchmark: 10 · Health goal (goal): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; transformation of naturally occurring trivalent chromium to hexavalent chromium by natural processes and human activities; discharges from electroplating factories, leather tanneries, wood preservation, chemical synthesis, refractory production, and textile manufacturing facilities.
Reported constituent · report p. 5 · official report
Nitrate (as Nitrogen)
The utility reported: 3.88 ppm
Reported range: ND - 8.70
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits
Reported constituent · report p. 5 · official report
Nitrate (as Nitrogen) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits
Reported constituent · report p. 5 · official report
Perchlorate
The utility reported: <0.10 ppb
Reported range: ND - 2.30
Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Perchlorate is an inorganic chemical used in solid rocket propellant, fireworks, explosives, flares, matches, and a variety of industries. It usually gets into drinking water as a result of environmental contamination from historic aerospace or other industrial operations that used or use, store, or dispose of perchlorate and its salts.
Reported constituent · report p. 5 · official report
Perchlorate (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Perchlorate is an inorganic chemical used in solid rocket propellant, fireworks, explosives, flares, matches, and a variety of industries. It usually gets into drinking water as a result of environmental contamination from historic aerospace or other industrial operations that used or use, store, or dispose of perchlorate and its salts.
Reported constituent · report p. 5 · official report
Bromate
The utility reported: 3 ppb
Reported range: ND - 12.00
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water ozonation
Reported constituent · report p. 7 · official report
Total Trihalomethanes
The utility reported: 22 ppb
Reported range: ND - 34.00
Benchmark: 80 · Health goal (goal): NS — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 7 · official report
Total Trihalomethanes (Purchased Surface Water)
The utility reported: 30.8 ppb
Reported range: 24.00 - 37.00
Benchmark: 80 · Health goal (goal): NS — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 7 · official report
Haloacetic Acids
The utility reported: 4 ppb
Reported range: ND - 8.60
Benchmark: 60 · Health goal (goal): NS — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 7 · official report
Haloacetic Acids (Purchased Surface Water)
The utility reported: 5.8 ppb
Reported range: 3.20 - 11.00
Benchmark: 60 · Health goal (goal): NS — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 7 · official report
Lead (El Monte/Whittier system)
The utility reported: Not detected at the report's stated reporting limit ppb
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 7 · official report
Copper (El Monte/Whittier system)
The utility reported: 330 ppb
Benchmark: 1300 · Health goal (goal): 300 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 7 · official report
Lead (Montebello system 2025)
The utility reported: Not detected at the report's stated reporting limit ppb
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 8 · official report
Copper (Montebello system 2025)
The utility reported: 180 ppb
Benchmark: 1300 · Health goal (goal): 300 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 8 · official report
Lead (Montebello system 2023)
The utility reported: 0.54 ppb
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 8 · official report
Copper (Montebello system 2023)
The utility reported: 230 ppb
Benchmark: 1300 · Health goal (goal): 300 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 8 · official report
San Gabriel Valley Water Company — unregulated monitoring and secondary (aesthetic) records (28)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Color
The utility reported: Not detected at the report's stated reporting limit units
Reported range: ND
Typical source, per the report: Naturally-occurring organic materials
Reported constituent · report p. 5 · official report
Color (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit units
Reported range: ND
Typical source, per the report: Naturally-occurring organic materials
Reported constituent · report p. 5 · official report
Odor-Threshold
The utility reported: 1 units
Reported range: 1
Typical source, per the report: Naturally-occurring organic materials
Reported constituent · report p. 5 · official report
Odor-Threshold (Purchased Surface Water)
The utility reported: 1 units
Reported range: 1
Typical source, per the report: Naturally-occurring organic materials
Reported constituent · report p. 5 · official report
Bromochloroacetic Acid (BCAA)
The utility reported: <0.30 ppb
Reported range: ND - 0.97
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 6 · official report
Chlorodibromoacetic Acid (CDBAA)
The utility reported: <0.30 ppb
Reported range: ND - 0.31
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 6 · official report
Dibromoacetic Acid (DBAA)
The utility reported: 0.43 ppb
Reported range: ND - 1.00
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 6 · official report
Dichloroacetic Acid (DCAA)
The utility reported: <0.20 ppb
Reported range: ND - 0.66
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. 6 · official report
Lithium
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Typical source, per the report: Naturally occurring; used in electrical chemical cells, batteries and organic synthesis and pharmaceuticals.
Reported constituent · report p. 6 · official report
Lithium (Purchased Surface Water)
The utility reported: 34 ppb
Reported range: 27.00 - 41.00
Typical source, per the report: Naturally occurring; used in electrical chemical cells, batteries and organic synthesis and pharmaceuticals.
Reported constituent · report p. 6 · official report
Methyl Ethyl Ketone (2-Butanone)
The utility reported: <0.50 ppb
Reported range: ND - 9.90
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
Molybdenum
The utility reported: 3.32 ppb
Reported range: 1.70 - 5.20
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
N-Nitrosomorpholine (NMOR)
The utility reported: <2.00 ppt
Reported range: ND - 3.10
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
N-Nitrosomorpholine (NMOR) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
Perfluorobutanoic Acid (PFBA)
The utility reported: <2.00 ppt
Reported range: ND - 12.00
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 6 · official report
Perfluorobutanoic Acid (PFBA) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 6 · official report
Perfluoropentanoic Acid (PFPeA)
The utility reported: <2.00 ppt
Reported range: ND - 6.40
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 6 · official report
Perfluoropentanoic Acid (PFPeA) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 6 · official report
Boron
The utility reported: 130 ppb
Reported range: NR - 130
Typical source, per the report: Runoff/leaching from natural deposits; industrial waste
Reported constituent · report p. 7 · official report
Chlorate
The utility reported: 31 ppb
Reported range: NR - 31
Typical source, per the report: Byproduct of drinking water chlorination; industrial processes
Reported constituent · report p. 7 · official report
Dichlorodifluoromethane (Freon 12)
The utility reported: <0.50 ppb
Reported range: ND - 0.66
Typical source, per the report: Industrial waste discharge
Reported constituent · report p. 7 · official report
Dichlorodifluoromethane (Freon 12) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Typical source, per the report: Industrial waste discharge
Reported constituent · report p. 7 · official report
Perfluorooctanesulfonic Acid (PFOS)
The utility reported: <2.00 ppt
Reported range: ND - 2.70
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 7 · official report
Perfluorooctanesulfonic Acid (PFOS) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 7 · official report
Perfluorohexanoic Acid (PFHxA)
The utility reported: <2.00 ppb
Reported range: ND - 5.50
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 7 · official report
Perfluorohexanoic Acid (PFHxA) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Reported constituent · report p. 7 · official report
Total Organic Carbon (TOC)
The utility reported: 0.33 ppm
Reported range: ND - 0.76
Typical source, per the report: Various natural and man-made sources; TOC is a precursor for the formation of disinfection byproducts
Reported constituent · report p. 7 · official report
Total Organic Carbon (TOC) (Purchased Surface Water)
The utility reported: 2.5 ppm
Reported range: 1.60 - 2.80
Typical source, per the report: Various natural and man-made sources; TOC is a precursor for the formation of disinfection byproducts
Reported constituent · report p. 7 · official report
California American Water - East Pasadena — regulated contaminants reported as detected (13)
Lead
The utility reported: 1 ppb
Reported range: ND to 5
AL: 15 · Health goal (MCLG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Copper
The utility reported: 0.198 ppm
Reported range: ND to 0.48
AL: 1.3 · Health goal (MCLG): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of household plumbing systems.
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Haloacetic Acids
The utility reported: 5.9 ppb
Reported range: NA
Legal limit (MCL): 60 · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 4 · official report
Total Trihalomethanes
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: NA
Legal limit (MCL): 80 · Health goal (MCLG): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 4 · official report
Chlorine
The utility reported: 1.06 ppm
Reported range: 0.84 to 1.24
MRDL: 4 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water additive used to control microbes.
DISINFECTANTS & DISINFECTION BY PRODUCTS · report p. 4 · official report
Arsenic
The utility reported: 0.78 ppb
Reported range: 0.7 to 0.85
Legal limit (MCL): 10 · Health goal (PHG (MCLG)): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; runoff from orchards; glass and electronic production wastes.
East Pasadena Wells · report p. 5 · official report
Barium
The utility reported: .016 ppm
Reported range: 0.15 to 0.16
Legal limit (MCL): 1 · Health goal (PHG (MCLG)): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; discharges of oi; drilling wastes and metal refineries.
East Pasadena Wells · report p. 5 · official report
Chromium
The utility reported: 9 ppb
Reported range: 8 to 10
Legal limit (MCL): 50 · Health goal (PHG (MCLG)): 100 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; discharge from steel & pulp mills as well as chrome plaiting .
East Pasadena Wells · report p. 5 · official report
Fluoride
The utility reported: 0.76 ppm
Reported range: 0.75 to 0.76
Legal limit (MCL): 2 · Health goal (PHG (MCLG)): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories.
East Pasadena Wells · report p. 5 · official report
Nitrate as N
The utility reported: 0.77 ppm
Reported range: 0.33 to 1.2
Legal limit (MCL): 10 · Health goal (PHG (MCLG)): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizer runoff; leaching from septic tanks, sewage; erosion of natural deposits.
East Pasadena Wells · report p. 5 · official report
Gross Alpha Particle Activity
The utility reported: 3.01 pCi/L
Reported range: 0.6 to 5.4
Legal limit (MCL): 15 · Health goal (PHG (MCLG)): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and man-made deposits.
East Pasadena Wells · report p. 5 · official report
Uranium
The utility reported: 1.25 pCi/L
Reported range: 1.2 to 1.3
Legal limit (MCL): 20 · Health goal (PHG (MCLG)): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits.
East Pasadena Wells · report p. 5 · official report
Chromium Hexavalent
The utility reported: 10.5 ppb
Reported range: 8.7 to 13
Legal limit (MCL): 10 · Health goal (PHG (MCLG)): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: The major source of hexavalent chromium is discharge from electroplating factories, leather tanneries, wood preservation, chemical synthesis, refractory production, and textile manufacturing facilities; erosion of natural deposits.
East Pasadena Wells · report p. 5 · official report
California American Water - East Pasadena — unregulated monitoring and secondary (aesthetic) records (2)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Specific Conductance
The utility reported: 340 mmhos/cm
Reported range: 330 to 350
Typical source, per the report: Substances that form ions when in water
SECONDARY REGULATED SUBSTANCES · report p. 6 · official report
Turbidity
The utility reported: 0.05 NTU
Reported range: ND to 0.10
Typical source, per the report: Soil runoff
SECONDARY REGULATED SUBSTANCES · report p. 6 · official report
South Arcadia Water System — regulated contaminants reported as detected (14)
Aluminum
The utility reported: Not detected at the report's stated reporting limit mg/L
Reported range: ND - 0.067
Legal limit (MCL): 1 · Health goal (PHG): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; residue from some surface water treatment processes
Inorganic Constituents · report p. 8 · official report
Chromium, Hexavalent
The utility reported: 4.4 µg/L
Reported range: 0.83 - 8.5
Legal limit (MCL): 10 · Health goal (PHG): 0.02 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; transformation of naturally occurring trivalent chromium to hexavalent chromium by natural processes and human activities, such as discharges from electroplating factories, leather tanneries, wood preservation, chemical synthesis, refractory production, and textile manufacturing facilities.
Inorganic Constituents · report p. 8 · official report
Fluoride
The utility reported: 0.6 mg/L
Reported range: 0.4 - 0.8
Legal limit (MCL): 2.0 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
Inorganic Constituents · report p. 8 · official report
Nitrate [as N]
The utility reported: 1.6 mg/L
Reported range: ND - 4.3
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits
Inorganic Constituents · report p. 8 · official report
Perchlorate
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: ND - 1.2
Legal limit (MCL): 6 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Perchlorate is an inorganic chemical used in solid rocket propellant, fireworks, explosives, flares, matches, and a variety of industries. It usually gets into drinking water as a result of environmental contamination from historic aerospace or other industrial operations that used or use, store, or dispose of perchlorate and its salts.
Inorganic Constituents · report p. 8 · official report
Tetrachloroethylene [PCE]
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: ND - 1.2
Legal limit (MCL): 5 · Health goal (PHG): 0.06 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharge from factories, dry cleaners, and auto shops (metal degreaser)
Volatile Organic Constituents · report p. 8 · official report
Gross Alpha Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 4.7
Legal limit (MCL): 15 · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Radioactive Constituents · report p. 8 · official report
Uranium
The utility reported: 1.8 pCi/L
Reported range: ND - 2.9
Legal limit (MCL): 20 · Health goal (PHG): 0.43 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Radioactive Constituents · report p. 8 · official report
Total Coliform Bacteria
The utility reported: More than 5% of monthly samples were present for total coliform in July. Level 1 assessment was triggered. (c) Present / Absent
Legal limit (MCL): > 40 Samples / Month · Health goal (MCLG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Naturally present in the environment
Microbiological Constituents · report p. 9 · official report
Chlorine [as Cl2]
The utility reported: 1.4 mg/L
Reported range: 0.2 - 2.2
MRDL: 4.0 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
Disinfection Byproducts and Disinfectant Residuals · report p. 9 · official report
HAA5 [Sum of 5 Haloacetic Acids]
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: ND - 1.3
Legal limit (MCL): 60
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Disinfection Byproducts and Disinfectant Residuals · report p. 9 · official report
TTHMs [Total Trihalomethanes]
The utility reported: 7.2 µg/L
Reported range: ND - 13
Legal limit (MCL): 80
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Disinfection Byproducts and Disinfectant Residuals · report p. 9 · official report
Copper
The utility reported: 0.28 mg/L
Reported range: None of the 31 samples collected exceeded the action level.
AL: 1.3 · Health goal (PHG): 0.3 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Inorganic Constituents · report p. 9 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: None of the 31 samples collected exceeded the action level.
AL: 15 · Health goal (PHG): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits.
Lead sampling in schools and residential plumbing · report p. 9 · official report
South Arcadia Water System — unregulated monitoring and secondary (aesthetic) records (14)
Unregulated means monitored without an applicable enforceable legal limit (MCL) — it does not mean unimportant or illegal. Secondary records address aesthetic, cosmetic, or technical effects such as taste, odor, staining, or scale, and are not automatically primary health standards.
Aluminum
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: ND - 67
Typical source, per the report: Erosion of natural deposits; residue from some surface water treatment processes
Secondary Standards - Aesthetic · report p. 8 · official report
Chloride
The utility reported: 13 mg/L
Reported range: 5.8 - 22
Typical source, per the report: Runoff/leaching from natural deposits; seawater influence
Secondary Standards - Aesthetic · report p. 8 · official report
Specific Conductance
The utility reported: 420 µS/cm
Reported range: 360 - 470
Typical source, per the report: Substances that form ions when in water; seawater influence
Secondary Standards - Aesthetic · report p. 8 · official report
Sulfate
The utility reported: 21 mg/L
Reported range: 15 - 28
Typical source, per the report: Runoff/leaching from natural deposits; industrial wastes
Secondary Standards - Aesthetic · report p. 8 · official report
Total Dissolved Solids
The utility reported: 230 mg/L
Reported range: 210 - 280
Typical source, per the report: Runoff/leaching from natural deposits
Secondary Standards - Aesthetic · report p. 8 · official report
Turbidity
The utility reported: 0.29 units
Reported range: 0.15 - 0.45
Typical source, per the report: Soil runoff
Secondary Standards - Aesthetic · report p. 8 · official report
Potassium
The utility reported: 1.3 mg/L
Reported range: 1.0 - 1.5
Other Parameters · report p. 8 · official report
Perfluorobutanoic acid (PFBA)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 6.2
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluorobutanesulfonic acid (PFBS)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 3.3
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluorohexanoic Acid (PFHxA)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 3.4
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluorohexanesulfonic Acid (PFHxS)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 6.6 (b)
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluorooctanoic acid (PFOA)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 9.2 (b)
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluorooctane Sulfonate (PFOS)
The utility reported: 6.0 ng/L
Reported range: ND - 20 (b)
Typical source, per the report: Discharge from manufacturing and industrial chemical facilities, use of certain consumer products, occupational exposures, and certain firefighting activities.
Unregulated Drinking Water Constituents · report p. 8 · official report
Perfluoropentanoic acid (PFPeA)
The utility reported: Not detected at the report's stated reporting limit ng/L
Reported range: ND - 3.4
Unregulated Drinking Water Constituents · report p. 8 · official report
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
City of Arcadia
Copper
The utility reported: 0.29 mg/l
Reported range: ND - 0.85
Typical source, per the report: Corrosion of household plumbing system
Reported constituent · report p. PAGE 4 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit µg/l
Reported range: ND
Typical source, per the report: Corrosion of household plumbing system
Reported constituent · report p. PAGE 4 · official report
San Gabriel Valley Water Company
Alkalinity (CaCO3)
The utility reported: 196.56 ppm
Reported range: 140.00 - 290.00
Reported constituent · report p. 6 · official report
Alkalinity (CaCO3) (Purchased Surface Water)
The utility reported: 110 ppm
Reported range: 95.00 - 124.00
Reported constituent · report p. 6 · official report
pH
The utility reported: 7.74 units
Reported range: 7.36 - 8.04
Reported constituent · report p. 6 · official report
pH (Purchased Surface Water)
The utility reported: 8.2 units
Reported range: 8.20 - 8.30
Reported constituent · report p. 6 · official report
Chloride
The utility reported: 37.5 ppm
Reported range: 4.20 - 110.00
Reported constituent · report p. 5 · official report
Chloride (Purchased Surface Water)
The utility reported: 92 ppm
Reported range: 86.00 - 98.00
Reported constituent · report p. 5 · official report
Sulfate
The utility reported: 61.37 ppm
Reported range: 21.00 - 150.00
Reported constituent · report p. 5 · official report
Sulfate (Purchased Surface Water)
The utility reported: 176 ppm
Reported range: 139.00 - 212.00
Reported constituent · report p. 5 · official report
Gross Alpha
The utility reported: 2.05 pCi/L
Reported range: ND - 7.66
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. 4 · official report
Lead (El Monte/Whittier system)
The utility reported: Not detected at the report's stated reporting limit ppb
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 7 · official report
Copper (El Monte/Whittier system)
The utility reported: 330 ppb
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 7 · official report
Lead (Montebello system 2025)
The utility reported: Not detected at the report's stated reporting limit ppb
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 8 · official report
Copper (Montebello system 2025)
The utility reported: 180 ppb
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 8 · official report
Lead (Montebello system 2023)
The utility reported: 0.54 ppb
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Reported constituent · report p. 8 · official report
Copper (Montebello system 2023)
The utility reported: 230 ppb
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Reported constituent · report p. 8 · official report
N-Nitrosomorpholine (NMOR)
The utility reported: <2.00 ppt
Reported range: ND - 3.10
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
N-Nitrosomorpholine (NMOR) (Purchased Surface Water)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Unknown
Reported constituent · report p. 6 · official report
California American Water - East Pasadena
Alkalinity as CaCO3
The utility reported: 190 ppm
OTHER SUBSTANCES OF INTEREST · report p. 6 · official report
Copper
The utility reported: 0.198 ppm
LEAD AND COPPER MONITORING PROGRAM · report p. 3 · official report
Gross Alpha Particle Activity
The utility reported: 3.01 pCi/L
Reported range: 0.6 to 5.4
Typical source, per the report: Decay of natural and man-made deposits.
East Pasadena Wells · report p. 5 · official report
South Arcadia Water System
Chloride
The utility reported: 13 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Lead 90th percentile
The utility reported: Not detected at the report's stated reporting limit µg/L
Lead sampling in schools and residential plumbing · report p. 9 · official report
Copper 90th percentile
The utility reported: 0.28 mg/L
Inorganic Constituents · report p. 9 · official report
Gross Alpha Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 4.7
Typical source, per the report: Erosion of natural deposits
Radioactive Constituents · report p. 8 · official report
Copper
The utility reported: 0.28 mg/L
Reported range: None of the 31 samples collected exceeded the action level.
Typical source, per the report: Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives
Inorganic Constituents · report p. 9 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit µg/L
Reported range: None of the 31 samples collected exceeded the action level.
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits.
Lead sampling in schools and residential plumbing · report p. 9 · official report
Whole-Home Relevance
What this may mean throughout your home
Local conditions can be relevant to equipment and fixtures — actual effects depend on your property.
Water heater (tank and tankless)
- What the local report can tell us
- The report's hardness and mineral values above are the system-level inputs most relevant to scale and sediment where water is heated.
- What a homeowner may notice
- Hardness minerals can contribute to scale on heating surfaces, sediment in tanks, and more frequent flushing or descaling needs.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Dishwasher and washing machine
- What the local report can tell us
- Reported hardness and secondary (aesthetic) records are the relevant system-level context for spotting and residue.
- What a homeowner may notice
- Hard water can change soap behavior and may contribute to spotting on dishes and residue in laundry.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Pipes, fixtures, faucets, and supply lines
- What the local report can tell us
- The corrosion-related inputs above (such as pH) describe the water entering the property — not the condition of any specific plumbing.
- What a homeowner may notice
- Mineral deposits can appear on aerators and fixtures; corrosion outcomes depend on materials, age, and water conditions together.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Drinking and cooking water
- What the local report can tell us
- The contaminant records above show what the utility reported for the system and period, with each benchmark type labeled.
- What a homeowner may notice
- Taste, odor, or aesthetic preferences can be noticeable even when health-based standards are met.
- What the report cannot tell us
- Property-specific outcomes — actual effects depend on temperature, use, equipment design, installation, maintenance, and property plumbing.
- Responsible next step
- Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Decision Pathways
Treatment pathways to evaluate
Treatment is a decision pathway, not a product conclusion — no equipment can be responsibly chosen from city-level data alone.
The evaluation sequence we follow, in order:
- 1Define the concern
- 2Verify utility-level and home-specific evidence
- 3Choose point of treatment
- 4Verify the exact certified reduction claim for the exact model
- 5Review tradeoffs and maintenance
Water filtration
- Objective it can address
- Specific substances or aesthetic conditions (taste, odor, chlorine character).
- Point of treatment
- Point of entry or point of use, depending on the objective.
- Limitations to verify
- A filter works only for the conditions and reduction claims its exact design and certification support — filtration does not soften water.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Water softening
- Objective it can address
- Hardness minerals (calcium and magnesium) and the scale they can contribute to.
- Point of treatment
- Typically point of entry, confirmed by evaluation.
- Limitations to verify
- Softening primarily exchanges hardness minerals — it is not a universal contaminant-removal device.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
Reverse osmosis
- Objective it can address
- Specified dissolved substances at a dedicated outlet, commonly drinking and cooking water.
- Point of treatment
- Typically point of use.
- Limitations to verify
- Produces a reject-water stream and needs pressure and maintenance; verify the exact NSF/ANSI 58 reduction claims for the exact model. It is not automatically the best system for every home.
Certification note: a standard number alone doesn't prove a product reduces every contaminant — the exact model's certified claim must match your objective.
When testing is the right next step
Use a certified laboratory when the concern is tap-specific, property-specific, or not resolved by the utility report.
When inspection is the right next step
Inspect the actual water heater and plumbing when symptoms involve hot-water odor, scale, sediment, corrosion, flow, noise, or repeated service demand.
Evidence You Can Check
Official reports, sources, and methodology
Official report — City of Arcadia
Annual Water Quality Report · data year 2025 · Current 2025 monitoring cycle
View the 2025 City of Arcadia Consumer Confidence ReportSource water, per the report: The water supply for the City of Arcadia comes from two sources: (1) groundwater from wells in the Main San Gabriel Basin; and (2) groundwater from wells in the Raymond Basin.
Official report — San Gabriel Valley Water Company
2025 Water Quality At A Glance · data year 2025 · Current 2025 monitoring cycle
View the 2025 San Gabriel Valley Water Company Consumer Confidence Report (PDF)Source water, per the report: The source of water provided to SGVWC's customers in 2025, except those located in the Whittier/Santa Fe Springs area, was groundwater produced from the Main San Gabriel Basin. The source of water provided to customers in the Whittier/Santa Fe Springs area south of Beverly Boulevard was a blend of groundwater from the Main San Gabriel Basin and the Central Basin. The source of water provided to the City's customers north of Whittier Boulevard is treated local groundwater produced from the Main San Gabriel Basin and the Central Basin. The source of water provided to the City's customers south of Whittier Boulevard is treated surface water from the Metropolitan Water District (MWD).
Official report — California American Water - East Pasadena
2025 Annual Water Quality Report Summary · data year 2025 · Current 2025 monitoring cycle
View the 2025 California American Water - East Pasadena Consumer Confidence ReportSource water, per the report: East Pasadena is served entirely by groundwater sources from the Main San Gabriel Basin.
Official report — South Arcadia Water System
Consumer Confidence Report on Water Quality for 2025 · data year 2025 · Current 2025 monitoring cycle
View the 2025 South Arcadia Water System Consumer Confidence ReportSource water, per the report: Water delivered to customers in the South Arcadia System is treated groundwater pumped from the Main San Gabriel Basin. The basin underlies the San Gabriel Valley from Alhambra to San Dimas.
Nearby community water profiles
Property-Specific Next Step
Request a Water Quality Evaluation
Request a water-heater and water-quality evaluation tailored to the property, equipment, and homeowner objective.
A property-specific evaluation confirms your goals, provider, tap conditions, plumbing, equipment, installation, and maintenance before any treatment recommendation — this profile alone is never used to prescribe equipment.
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