Your Local Water Profile: Brea
This profile explains what the applicable water provider reported for Brea, what those results may mean throughout a home, and where property-specific testing or inspection may still be needed.
First, confirm your water provider.
Water service can vary by address. Confirm the provider shown on your water bill before applying provider-specific results.
What the official water report says
Your water at a glance
City of Brea
The report lists hardness as 225 ppm as CaCO3; this is not classified because the reported unit could not be normalized 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.
Yorba Linda Water District
The report lists hardness as 270 ppm; this is very hard on the USGS scale.
Reported range: 235 - 305 ppm
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 237 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.
City of Brea Water Division — compliance, as reported
The report states: “Your drinking water meets or exceeds all state and federal standards, with rigorous monitoring in place.”
Violations or advisories, as reported: No violations were reported. Lead was detected in 2 homes, and 1 exceeded the regulatory action level.
Yorba Linda Water District — compliance, as reported
The report states: “As in years past, the water delivered to your home meets or exceeds the standards required by the state and federal regulatory agencies.”
Violations or advisories, as reported: The water system has always complied with state and federal drinking water regulations and water quality standards, with no violations reported.
West Orange County Water System — compliance, as reported
The report states: “YOUR WATER MEETS ALL CURRENT FEDERAL AND STATE REQUIREMENTS [p. 8, West Orange County Water System – Source Water Quality]”
Violations or advisories, as reported: In 2025, GSWC sampled groundwater sources in the West Orange County 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, Laboratory Analyses]
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
City of Brea Water Division
Alkalinity, total
The utility reported: 170 ppm as CaCO3
Imported Groundwater · report p. PAGE 5 · official report
Bicarbonate
The utility reported: 205 ppm as HCO3
Imported Groundwater · report p. PAGE 5 · official report
Hardness, total
The utility reported: 225 ppm as CaCO3
Imported Groundwater · report p. PAGE 5 · official report
Alkalinity, total as CaCO3
The utility reported: 108 ppm
Treated Surface Water · report p. PAGE 6 · official report
Hardness, total as CaCO3
The utility reported: 236 ppm
Treated Surface Water · report p. PAGE 6 · official report
Hardness, total
The utility reported: 14 grains/gal
Treated Surface Water · report p. PAGE 6 · official report
Odor
The utility reported: 1 threshold odor number
Distribution System · report p. PAGE 4 · official report
Turbidity
The utility reported: Not detected at the report's stated reporting limit ppm
Imported Groundwater · report p. PAGE 5 · official report
Turbidity - combined filter effluent
The utility reported: 0.05 NTU
Diemer Filtration Plant · report p. PAGE 6 · official report
Total Trihalomethanes
The utility reported: 24 ppb
Distribution System · report p. PAGE 4 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Residential Taps · report p. PAGE 4 · official report
Tetrachloroethylene, PCE
The utility reported: 2 ppb
Imported Groundwater · report p. PAGE 5 · official report
Trichloroethylene, TCE
The utility reported: 2.7 ppb
Imported Groundwater · report p. PAGE 5 · official report
Hexavalent Chromium
The utility reported: 2.6 ppb
Imported Groundwater · report p. PAGE 5 · official report
Yorba Linda Water District
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Calcium
The utility reported: 68 ppm
Reported range: 58 - 78
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Hardness, total as CaCO3
The utility reported: 270 ppm
Reported range: 235 - 305
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Hardness, total
The utility reported: 16 grains/gallon
Reported range: 14 - 18
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Magnesium
The utility reported: 26 ppm
Reported range: 22 - 29
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
pH
The utility reported: 8.2 pH units
Reported range: 8.2
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Sodium
The utility reported: 103 ppm
Reported range: 90 - 116
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Total Dissolved Solids
The utility reported: 621 ppm
Reported range: 556 - 686
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Color
The utility reported: 2 color units
Reported range: 1 - 2
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Specific Conductance
The utility reported: 979 μmho/cm
Reported range: 888 - 1,070
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Turbidity
The utility reported: 0.06 NTU
Turbidity - combined filter effluent · report p. 8 · official report
Alkalinity, total
The utility reported: 229 ppm as CaCO3
Reported range: 199 - 256
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Calcium
The utility reported: 101 ppm
Reported range: 76.9 - 126
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Hardness, total
The utility reported: 20 grains/gal
Reported range: 16 - 25
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Hardness, total
The utility reported: 347 ppm as CaCO3
Reported range: 266 - 430
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Magnesium
The utility reported: 23.2 ppm
Reported range: 18 - 27.9
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
pH
The utility reported: 7.8 pH units
Reported range: 7.7 - 8
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Sodium
The utility reported: 103 ppm
Reported range: 91.8 - 11
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Chloride
The utility reported: 128 ppm
Reported range: 116 - 138
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Sulfate
The utility reported: 144 ppm
Reported range: 114 - 180
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Total Dissolved Solids
The utility reported: 691 ppm
Reported range: 598 - 804
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Color
The utility reported: Not detected at the report's stated reporting limit color units
Reported range: ND - 5
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Specific Conductance
The utility reported: 1,095 µmho/cm
Reported range: 942 - 1,210
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Turbidity
The utility reported: Not detected at the report's stated reporting limit NTU
Reported range: ND - 0.15
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Chlorine Residual
The utility reported: 1.3 ppm
Reported range: 1.09 - 1.4
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
Color
The utility reported: Not detected at the report's stated reporting limit color units
Reported range: ND - 5
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
Odor
The utility reported: Not detected at the report's stated reporting limit threshold odor number
Reported range: ND - 2
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
Turbidity
The utility reported: Not detected at the report's stated reporting limit ntu
Reported range: ND - 1.1
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
West Orange County Water System
Hardness [as CaCO3]
The utility reported: 13.8 grains/gal
Other Parameters · report p. 8 · official report
Total Dissolved Solids
The utility reported: 412 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Chloride
The utility reported: 44.9 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Sulfate
The utility reported: 92.7 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Lead
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
Chlorine [as Cl2]
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 Brea Water Division — regulated contaminants reported as detected (26)
Total Trihalomethanes
The utility reported: 24 ppb
Reported range: 1–19
Benchmark: 80
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
Reported constituent · report p. PAGE 4 · official report
Haloacetic Acids
The utility reported: 5 ppb
Reported range: ND–5.3
Benchmark: 60
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
Reported constituent · report p. PAGE 4 · official report
Chlorine Residual
The utility reported: 1.23 ppm
Reported range: 0.39–1.64
Benchmark: 4 · Health goal (goal): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Disinfectant Added for Treatment
Reported constituent · report p. PAGE 4 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 34
Benchmark: 15 · Health goal (goal): 0.2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Corrosion of Household Plumbing
Reported constituent · report p. PAGE 4 · official report
Copper
The utility reported: 0.23 ppm
Reported range: ND - 0.56
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
Reported constituent · report p. PAGE 4 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 3.3
Benchmark: 15 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Combined Radium
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 1
Benchmark: 5 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Uranium
The utility reported: 2.7 pCi/L
Reported range: 2.3 - 3.2
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 5 · official report
1,1-Dichloroethene
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 0.53
Benchmark: 6 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Industrial Discharge
Reported constituent · report p. PAGE 5 · official report
Cis-1,2-Dichloroethene
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 0.62
Benchmark: 6 · Health goal (goal): 13 — not an enforceable limit
Violation per report: No
Typical source, per the report: Industrial Discharge
Reported constituent · report p. PAGE 5 · official report
Tetrachloroethylene, PCE
The utility reported: 2 ppb
Reported range: 0.69 - 3.4
Benchmark: 5 · Health goal (goal): 0.06 — not an enforceable limit
Violation per report: No
Typical source, per the report: Industrial Discharge
Reported constituent · report p. PAGE 5 · official report
Trichloroethylene, TCE
The utility reported: 2.7 ppb
Reported range: 0.63 - 4
Benchmark: 5 · Health goal (goal): 1.7 — not an enforceable limit
Violation per report: No
Typical source, per the report: Industrial Discharge
Reported constituent · report p. PAGE 5 · official report
Arsenic
The utility reported: 2.1 ppm
Reported range: ND - 2.4
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 5 · official report
Barium
The utility reported: 0.12 ppm
Reported range: 0.12
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Fluoride
The utility reported: 0.31 ppm
Reported range: 0.26 - 0.35
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 5 · official report
Hexavalent Chromium
The utility reported: 2.6 ppb
Reported range: 2.4 - 2.7
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 5 · official report
Nitrate
The utility reported: 3.4 ppm as N
Reported range: 2.2 - 4.4
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, Septic Tanks
Reported constituent · report p. PAGE 5 · official report
Nitrate+Nitrite
The utility reported: 3.4 ppm as N
Reported range: 2.2 - 4.4
Benchmark: 10 · Health goal (goal): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, Septic Tanks
Reported constituent · report p. PAGE 5 · official report
Perchlorate
The utility reported: 2.1 ppb
Reported range: ND - 5.7
Benchmark: 6 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Industrial Discharge
Reported constituent · report p. PAGE 5 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Benchmark: 15 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Gross Beta Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 6
Benchmark: 50 · Health goal (goal): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of Natural and Man-made Deposits
Reported constituent · report p. PAGE 6 · official report
Uranium
The utility reported: 1 pCi/L
Reported range: ND - 3
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 6 · official report
Aluminum
The utility reported: 0.058 ppm
Reported range: ND - 0.082
Benchmark: 1 · Health goal (goal): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Barium
The utility reported: 0.13 ppm
Reported range: 0.13
Benchmark: 1 · Health goal (goal): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Refinery Discharge, Erosion of Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Bromate
The utility reported: 2.4 ppb
Reported range: ND - 8.4
Benchmark: 10 · Health goal (goal): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of Drinking Water Ozonation
Reported constituent · report p. PAGE 6 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.6 - 0.8
Benchmark: 2 · Health goal (goal): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water Additive for Dental Health
Reported constituent · report p. PAGE 6 · official report
City of Brea Water Division — unregulated monitoring and secondary (aesthetic) records (34)
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: 3 color units
Reported range: 3
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 4 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 4 · official report
Turbidity
The utility reported: 0.1 ntu
Reported range: 0.1 - 0.26
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 4 · official report
Chloride
The utility reported: 21 ppm
Reported range: 18 - 24
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Odor
The utility reported: 1 threshold odor number
Reported range: 1
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 5 · official report
Specific Conductance
The utility reported: 495 µmho/cm
Reported range: 480 - 510
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Sulfate
The utility reported: 44 ppm
Reported range: 40 - 47
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Total Dissolved Solids
The utility reported: 330 ppm
Reported range: 300 - 360
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Turbidity
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.11
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Alkalinity, total
The utility reported: 170 ppm as CaCO3
Reported range: 170
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Bicarbonate
The utility reported: 205 ppm as HCO3
Reported range: 200 - 210
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Calcium
The utility reported: 70 ppm
Reported range: 65 - 74
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Hardness, total
The utility reported: 225 ppm as CaCO3
Reported range: 210 - 240
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
pH
The utility reported: 8.1 pH units
Reported range: 8 - 8.1
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 5 · official report
Potassium
The utility reported: 3.6 ppm
Reported range: 3.5 - 3.6
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Sodium
The utility reported: 18 ppm
Reported range: 16 - 19
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Lithium
The utility reported: 28 ppb
Reported range: ND - 56
Reported constituent · report p. PAGE 5 · official report
Aluminum
The utility reported: 58 ppb
Reported range: ND - 82
Typical source, per the report: Treatment Process Residue, Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Chloride
The utility reported: 92 ppm
Reported range: 84 - 99
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Color
The utility reported: 1 color units
Reported range: 1
Typical source, per the report: Naturally-occurring Organic Materials
Reported constituent · report p. PAGE 6 · official report
Specific Conductance
The utility reported: 873 µmho/cm
Reported range: 759 - 987
Typical source, per the report: Substances that Form Ions in Water
Reported constituent · report p. PAGE 6 · official report
Sulfate
The utility reported: 182 ppm
Reported range: 146 - 218
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Total Dissolved Solids
The utility reported: 545 ppm
Reported range: 465 - 625
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Alkalinity, total as CaCO3
The utility reported: 108 ppm
Reported range: 93 - 122
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Boron
The utility reported: 0.13 ppm
Reported range: 0.13
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Calcium
The utility reported: 56 ppm
Reported range: 44 - 68
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Hardness, total as CaCO3
The utility reported: 236 ppm
Reported range: 191 - 280
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Hardness, total
The utility reported: 14 grains/gal
Reported range: 11 - 16
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Magnesium
The utility reported: 22 ppm
Reported range: 19 - 25
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
pH
The utility reported: 8.3 units
Reported range: 8.2 - 8.3
Typical source, per the report: Hydrogen Ion Concentration
Reported constituent · report p. PAGE 6 · official report
Potassium
The utility reported: 4.3 ppm
Reported range: 3.8 - 4.8
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Sodium
The utility reported: 88 ppm
Reported range: 78 - 97
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Total Organic Carbon
The utility reported: 2.4 ppm
Reported range: 1.6 - 2.6
Typical source, per the report: Various Natural and Man-made Sources
Reported constituent · report p. PAGE 6 · official report
Lithium
The utility reported: 11 ppb
Reported range: ND - 51
Reported constituent · report p. PAGE 6 · official report
Yorba Linda Water District — regulated contaminants reported as detected (18)
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Legal limit (MCL): 15 · Health goal (MCLG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Gross Beta Particle Activity
The utility reported: 4 pCi/L
Reported range: ND - 5
Legal limit (MCL): 50 · Health goal (MCLG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of Natural and Man-made Deposits
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Uranium
The utility reported: 1 pCi/L
Reported range: ND - 3
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
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Aluminum
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.11
Legal limit (MCL): 1 · Health goal (PHG): 0.6 — not an enforceable limit
Violation per report: No
Typical source, per the report: Treatment Process Residue, Natural Deposits
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Barium
The utility reported: 0.124 ppm
Reported range: 0.124
Legal limit (MCL): 1 · Health goal (PHG): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Refinery Discharge, Erosion of Natural Deposits
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Bromate
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 1.6
Legal limit (MCL): 10 · Health goal (MCLG): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of Drinking Water Ozonation
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.6 - 0.8
Legal limit (MCL): 2 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Water Additive for Dental Health
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Uranium
The utility reported: 7.8 pCi/L
Reported range: 4.8 - 11
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
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Arsenic
The utility reported: 4.3 ppb
Reported range: 2.7 - 5.9
Legal limit (MCL): 10 · Health goal (PHG): 0.004 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Barium
The utility reported: Not detected at the report's stated reporting limit ppm
Reported range: ND - 0.112
Legal limit (MCL): 1 · Health goal (PHG): 2 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Hexavalent Chromium
The utility reported: 0.11 ppb
Reported range: ND - 0.55
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
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Fluoride
The utility reported: 0.48 ppm
Reported range: 0.42 - 0.56
Legal limit (MCL): 2 · Health goal (PHG): 1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of Natural Deposits
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Nitrate
The utility reported: 1.19 ppm as N
Reported range: 0.84 - 1.64
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, Septic Tanks
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Nitrate+Nitrite
The utility reported: 1.19 ppm as N
Reported range: 0.84 - 1.64
Legal limit (MCL): 10 · Health goal (PHG): 10 — not an enforceable limit
Violation per report: No
Typical source, per the report: Fertilizers, Septic Tanks
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Total Trihalomethanes
The utility reported: 58 ppb
Reported range: 23 - 71
Legal limit (MCL): 80
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
Haloacetic Acids
The utility reported: 21 ppb
Reported range: 4 - 20
Legal limit (MCL): 60
Violation per report: No
Typical source, per the report: Byproducts of Chlorine Disinfection
2024 Yorba Linda Water District Distribution System Water Quality · report p. 10 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
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 and Copper Action Levels at Residential Taps · report p. 10 · official report
Copper
The utility reported: 0.61 ppm
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 water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Lead and Copper Action Levels at Residential Taps · report p. 10 · official report
Yorba Linda Water District — unregulated monitoring and secondary (aesthetic) records (19)
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 ppb
Reported range: ND - 110
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Boron
The utility reported: 0.14 ppm
Reported range: 0.14
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Potassium
The utility reported: 4.9 ppm
Reported range: 4.4 - 5.4
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Total Organic Carbon
The utility reported: 2.4 ppm
Reported range: 2 - 2.5
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Lithium
The utility reported: 22 ppb
Reported range: ND - 36
Unregulated Chemicals Requiring Monitoring · report p. 8 · official report
Manganese
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND - 4.6
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Bicarbonate
The utility reported: 280 ppm as HCO3
Reported range: 242 - 313
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Boron
The utility reported: 0.27 ppm
Reported range: 0.25 - 0.29
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Bromide
The utility reported: 0.16 ppm
Reported range: 0.04 - 0.25
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Perfluorobutanoic Acid
The utility reported: 19 ppt
Reported range: 12 - 23
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Perfluorohexanoic Acid
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND - 3.5
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Perfluoropentanoic Acid
The utility reported: 5 ppt
Reported range: 3.8 - 6.9
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Potassium
The utility reported: 6 ppm
Reported range: 5.3 - 7
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Total Organic Carbon
The utility reported: 0.96 ppm
Reported range: 0.7 - 1.33
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Vanadium
The utility reported: 4.5 ppb
Reported range: 3.7 - 6.6
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Lithium
The utility reported: 9.9 ppb
Reported range: 9.9
Unregulated Chemicals Requiring Monitoring*** · report p. 9 · official report
Perfluorobutanoic Acid
The utility reported: 19 ppt
Reported range: 18 - 21
Unregulated Chemicals Requiring Monitoring*** · report p. 9 · official report
Perfluorobutanoic Acid
The utility reported: 2.4 ppt
Reported range: 2.2 - 2.5
Unregulated Chemicals Requiring Monitoring*** · report p. 9 · official report
Perfluorobutanoic Acid
The utility reported: 4.8 ppt
Reported range: 4.2 - 5.3
Unregulated Chemicals Requiring Monitoring*** · report p. 9 · official report
West Orange County Water System — regulated contaminants reported as detected (15)
Turbidity Highest single measurement of the treated surface water
The utility reported: 0.05 NTU
TT: 1.0
Violation per report: No
Typical source, per the report: Soil runoff
Primary Standards - Health Based · report p. 8 · official report
Turbidity Lowest percent of all monthly readings less than 0.3 NTU
The utility reported: 100% %
TT: 95
Violation per report: No
Typical source, per the report: Soil runoff
Primary Standards - Health Based · report p. 8 · official report
Arsenic
The utility reported: 2.4 µg/L
Reported range: ND - 4.1
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 electronics production wastes
Primary Standards - Health Based · report p. 8 · official report
Chromium, Hexavalent
The utility reported: 0.8 µg/L
Reported range: ND - 2.9
Legal limit (MCL): 10 · Health goal (PHG (MCLG)): 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.
Primary Standards - Health Based · report p. 8 · official report
Fluoride
The utility reported: 0.5 mg/L
Reported range: 0.4 - 0.8
Legal limit (MCL): 2.0 · Health goal (PHG (MCLG)): 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
Primary Standards - Health Based · report p. 8 · official report
Nitrate [as N]
The utility reported: 1.5 mg/L
Reported range: ND - 4.5
Legal limit (MCL): 10 · Health goal (PHG (MCLG)): 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
Primary Standards - Health Based · report p. 8 · official report
Perchlorate
The utility reported: 1.1 µg/L
Reported range: ND - 3.2
Legal limit (MCL): 6 · Health goal (PHG (MCLG)): 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.
Primary Standards - Health Based · report p. 8 · official report
Gross Alpha Activity
The utility reported: 5.17 pCi/L
Reported range: ND - 17.1
Legal limit (MCL): 15(a) · Health goal (PHG (MCLG)): (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
Gross Beta Activity
The utility reported: 5.70 pCi/L
Reported range: ND - 17.1
Legal limit (MCL): 50(b) · Health goal (PHG (MCLG)): (0) — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and manmade deposits
Radioactive Constituents · report p. 8 · official report
Uranium
The utility reported: 6.71 pCi/L
Reported range: ND - 21.9 (c)
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
Radioactive Constituents · report p. 8 · official report
Bromate
The utility reported: 2.4 µg/L
Reported range: ND - 8.4
Legal limit (MCL): 10 · Health goal (PHG (MRDLG)): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
Disinfection Byproducts and Disinfectant Residuals · report p. 9 · official report
Chlorine [as Cl2]
The utility reported: 1.4 mg/L
Reported range: 0.1 - 3.8
MRDL: (4.0) · Health goal (PHG (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: 6.0 µg/L
Reported range: ND - 7.2
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: 30 µg/L
Reported range: 1.6 - 35
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: 0.25 mg/L
Reported range: None of the 51 samples collected exceeded the action level.
AL: 1.3 · Health goal (PHG (MCLG)): 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
West Orange County Water System — unregulated monitoring and secondary (aesthetic) records (8)
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: 44.9 mg/L
Reported range: 12.0 - 99.0
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: 647 µS/cm
Reported range: 363 - 987
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: 92.7 mg/L
Reported range: 34.4 - 218
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: 412 mg/L
Reported range: 204 - 625
Typical source, per the report: Runoff/leaching from natural deposits
Secondary Standards - Aesthetic · report p. 8 · official report
Turbidity
The utility reported: 0.1 units
Reported range: ND - 1
Typical source, per the report: Soil runoff
Secondary Standards - Aesthetic · report p. 8 · official report
Perfluorohexanesulfonic Acid (PFHxS)
The utility reported: 4.0 ng/L
Reported range: ND - 10.3 (e)
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: 3.0 ng/L
Reported range: ND - 8.3 (e)
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: 5.8 ng/L
Reported range: ND - 16.4 (e)
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
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
City of Brea Water Division
Alkalinity, total
The utility reported: 170 ppm as CaCO3
Imported Groundwater · report p. PAGE 5 · official report
Alkalinity, total as CaCO3
The utility reported: 108 ppm
Treated Surface Water · report p. PAGE 6 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Residential Taps · report p. PAGE 4 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 3.3
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Chloride
The utility reported: 21 ppm
Reported range: 18 - 24
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Sulfate
The utility reported: 44 ppm
Reported range: 40 - 47
Typical source, per the report: Erosion of Natural Deposits
Reported constituent · report p. PAGE 5 · official report
Chloride
The utility reported: 92 ppm
Reported range: 84 - 99
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Sulfate
The utility reported: 182 ppm
Reported range: 146 - 218
Typical source, per the report: Runoff or Leaching from Natural Deposits
Reported constituent · report p. PAGE 6 · official report
Yorba Linda Water District
Alkalinity, total as CaCO3
The utility reported: 114 ppm
Reported range: 105 - 123
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
pH
The utility reported: 8.2 pH units
Reported range: 8.2
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Chloride
The utility reported: 104 ppm
Reported range: 93 - 116
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Sulfate
The utility reported: 224 ppm
Reported range: 196 - 253
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Alkalinity, total
The utility reported: 229 ppm as CaCO3
Reported range: 199 - 256
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
pH
The utility reported: 7.8 pH units
Reported range: 7.7 - 8
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Chloride
The utility reported: 128 ppm
Reported range: 116 - 138
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Sulfate
The utility reported: 144 ppm
Reported range: 114 - 180
2024 Yorba Linda Water District Groundwater Quality · report p. 9 · official report
Gross Alpha Particle Activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND - 5
Typical source, per the report: Erosion of Natural Deposits
2024 Metropolitan Water District of Southern California Treated Surface Water · report p. 8 · official report
Lead
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
Lead and Copper Action Levels at Residential Taps · report p. 10 · official report
Copper
The utility reported: 0.61 ppm
Typical source, per the report: Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits
Lead and Copper Action Levels at Residential Taps · report p. 10 · official report
West Orange County Water System
Chloride
The utility reported: 44.9 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Sulfate
The utility reported: 92.7 mg/L
Secondary Standards - Aesthetic · report p. 8 · official report
Lead
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
Gross Alpha Activity
The utility reported: 5.17 pCi/L
Reported range: ND - 17.1
Typical source, per the report: Erosion of natural deposits
Radioactive Constituents · report p. 8 · 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 Brea Water Division
Your Water Quality Report · data year 2025 · Current 2025 monitoring cycle
View the 2025 City of Brea Water Division Consumer Confidence ReportSource water, per the report: Drinking water is a blend of surface water imported by the MWDSC and groundwater imported from Cal Domestic in Whittier. MWDSC's imported water sources are the Colorado River and the State Water Project, which draws water from the Sacramento-San Joaquin River Delta. Cal Domestic water originates from the Main San Gabriel groundwater basin.
Official report — Yorba Linda Water District
2025 Water Quality Report · data year 2024 · 2024 data retained; monitor for the next official update
View the 2024 Yorba Linda Water District Consumer Confidence Report (PDF)Source water, per the report: The District's water supply consists of groundwater from the Orange County Groundwater Basin (about 85%) and treated surface water imported from Northern California and the Colorado River by MWD (about 15%).
Official report — West Orange County Water System
Consumer Confidence Report on Water Quality for 2025 · data year 2025 · Current 2025 monitoring cycle
View the 2025 West Orange County Water System Consumer Confidence ReportSource water, per the report: Water delivered to customers in the West Orange County System is a blend of treated groundwater pumped from the Orange County Groundwater Basin and imported water from the Colorado River Aqueduct and the State Water Project (imported and distributed by the Metropolitan Water District of Southern California).
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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