Your Local Water Profile: Torrance
This profile explains what the applicable water provider reported for Torrance, 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
California Water Service - Rancho Dominguez
The report lists hardness as 126 ppm; 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 Torrance Municipal Water Utility — compliance, as reported
The report states: “Our water is monitored for many different kinds of substances on a very strict sampling schedule, and the water we deliver must meet specific health standards.”
Violations or advisories, as reported: None stated.
California Water Service - Rancho Dominguez District (Dominguez System) — compliance, as reported
The report states: “WE ARE PLEASED TO CONFIRM THAT WE MET EVERY PRIMARY AND SECONDARY FEDERAL AND STATE WATER QUALITY STANDARD LAST YEAR. [p. 3]”
Violations or advisories, as reported: In one sample in the Dominguez system, color, apparent exceeded the SMCL of 15 CU. The source water was being cleared and did not provide this water to the distribution system. The RAA is less then the SMCL. Samples collected at well 290-01 exceeded the NL for FPHxS four times in 2024. Notification was issued, and well 290-01 remained in service. The water remained under the RL and was in compliance.
City of Lomita Water Dept — compliance, as reported
No overall compliance statement was extracted from the reviewed report.
The Three C's — 1 of 3
Chemistry
What does this water tend to do in a home?
City of Torrance Municipal Water Utility
Chloride
The utility reported: 121.5 ppm
Reported range: 81-160
Reported constituent · report p. [5] · official report
Specific Conductance
The utility reported: 1166.7 \u00b5S/cm
Reported range: 1100-1200
Reported constituent · report p. [5] · official report
Sulfate
The utility reported: 246.8 ppm
Reported range: 52-290
Reported constituent · report p. [5] · official report
Total Dissolved Solids
The utility reported: 695.6 ppm
Reported range: 630-760
Reported constituent · report p. [5] · official report
Chlorine
The utility reported: 1.74 ppm
Reported range: 0.13-2.64
Reported constituent · report p. [4] · official report
Haloacetic Acids [HAA5]
The utility reported: 10.7 ppb
Reported range: 1.2-13.1
Reported constituent · report p. [4] · official report
Total Trihalomethanes [TTHMs]
The utility reported: 54.8 ppb
Reported range: 1.2-57.2
Reported constituent · report p. [4] · official report
Copper
The utility reported: 0.17 ppm
Reported range: ND-0.44
Reported constituent · report p. [5] · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND-ND
Reported constituent · report p. [5] · official report
Corrosivity
The utility reported: 11.7 units
Reported range: NA
Reported constituent · report p. [5] · official report
California Water Service - Rancho Dominguez District (Dominguez System)
Hardness (total)
The utility reported: 126 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Hardness (total)
The utility reported: 234 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Calcium
The utility reported: 37 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Calcium
The utility reported: 56 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Magnesium
The utility reported: 8.1 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Magnesium
The utility reported: 22 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
pH
The utility reported: 8.0 Units
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
pH
The utility reported: 8.2 Units
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Alkalinity (total)
The utility reported: 157 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Alkalinity (total)
The utility reported: 110 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Total dissolved solids
The utility reported: 278 ppm
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Total dissolved solids, filterable (TDS)
The utility reported: 536 ppm
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Chloride
The utility reported: 48 ppm
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Chloride
The utility reported: 92 ppm
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Sulfate
The utility reported: 29 ppm
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Sulfate
The utility reported: 176 ppm
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Sodium
The utility reported: 59 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Sodium
The utility reported: 89 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
PRIMARY DRINKING WATER STANDARDS - Lead and Copper · report p. 13 · official report
Copper
The utility reported: 0.307 ppm
PRIMARY DRINKING WATER STANDARDS - Lead and Copper · report p. 13 · official report
Total chlorine
The utility reported: 1.9 ppm
PRIMARY DRINKING WATER STANDARDS - Disinfectants · report p. 13 · official report
Calcium carbonate precipitation potential (CCPP)
The utility reported: 7.6 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Corrosivity (as aggressiveness index)
The utility reported: 12.4 AI
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Corrosivity (as saturation index)
The utility reported: 0.56 SI
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
City of Lomita Water Dept
General mineral and treatment characteristics were not itemized in this provider's reviewed report. The official report link in the Sources section below is the authoritative record.
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 Torrance Municipal Water Utility — regulated contaminants reported as detected (13)
Aluminum
The utility reported: 0.08 ppm
Reported range: ND-0.10
Benchmark: 1 · Health goal (goal): 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
Reported constituent · report p. [4] · official report
Barium
The utility reported: 0.089 ppm
Reported range: ND-0.14
Benchmark: 1 · Health goal (goal): 2 — 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
Chlorine
The utility reported: 1.74 ppm
Reported range: 0.13-2.64
Benchmark: 4.0 · Health goal (goal): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
Reported constituent · report p. [4] · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.64-1.1
Benchmark: 2.0 · 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
Gross Alpha Particle Activity
The utility reported: 0.04 pCi/L
Reported range: ND-2.95
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. [4] · official report
Haloacetic Acids [HAA5]
The utility reported: 10.7 ppb
Reported range: 1.2-13.1
Benchmark: 60 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. [4] · official report
Methyl Tert-Butyl Ether [MTBE]
The utility reported: 4 ppb
Reported range: ND-25
Benchmark: 13 · Health goal (goal): 13 — not an enforceable limit
Violation per report: No
Typical source, per the report: Leaking from underground gasoline storage tanks; discharge from petroleum and chemical factories
Reported constituent · report p. [4] · official report
Radium 226
The utility reported: 0.02 pCi/L
Reported range: ND-0.51
Benchmark: 5 · Health goal (goal): 0.05 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. [4] · official report
Radium 228
The utility reported: 0.22 pCi/L
Reported range: ND-1.69
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
Total Trihalomethanes [TTHMs]
The utility reported: 54.8 ppb
Reported range: 1.2-57.2
Benchmark: 80 · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: By-product of drinking water disinfection
Reported constituent · report p. [4] · official report
Turbidity
The utility reported: 0.3 NTU
Reported range: NA
Benchmark: TT · Health goal (goal): NA — not an enforceable limit
Violation per report: No
Typical source, per the report: Soil runoff
Reported constituent · report p. [4] · official report
Uranium
The utility reported: 0.07 pCi/L
Reported range: ND-2.0
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
Copper
The utility reported: 0.17 ppm
Reported range: ND-0.44
Benchmark: 1.3 · Health goal (goal): 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
Reported constituent · report p. [5] · official report
City of Torrance Municipal Water Utility — unregulated monitoring and secondary (aesthetic) records (11)
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: 80 ppb
Reported range: ND-100
Reported constituent · report p. [5] · official report
Chloride
The utility reported: 121.5 ppm
Reported range: 81-160
Reported constituent · report p. [5] · official report
Color
The utility reported: 1 units
Reported range: ND-1
Reported constituent · report p. [5] · official report
Corrosivity
The utility reported: 11.7 units
Reported range: NA
Reported constituent · report p. [5] · official report
Manganese
The utility reported: 44.7 ppb
Reported range: 42-48
Reported constituent · report p. [5] · official report
Odor, Threshold
The utility reported: 0.5 TON
Reported range: ND-2.0
Reported constituent · report p. [5] · official report
Specific Conductance
The utility reported: 1166.7 \u00b5S/cm
Reported range: 1100-1200
Reported constituent · report p. [5] · official report
Sulfate
The utility reported: 246.8 ppm
Reported range: 52-290
Reported constituent · report p. [5] · official report
Total Dissolved Solids
The utility reported: 695.6 ppm
Reported range: 630-760
Reported constituent · report p. [5] · official report
Turbidity
The utility reported: 0.13 NTU
Reported range: 0.13-0.15
Reported constituent · report p. [5] · official report
Lithium
The utility reported: 13.1 ppb
Reported range: ND-58
Reported constituent · report p. [5] · official report
California Water Service - Rancho Dominguez District (Dominguez System) — regulated contaminants reported as detected (19)
Fluoride
The utility reported: 0.54 ppm
Reported range: 0.18-0.73
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, Water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
PRIMARY DRINKING WATER STANDARDS - Inorganic Chemicals · report p. 13 · official report
Selenium
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND-5.7
Legal limit (MCL): 50 · Health goal (PHG): 30 — not an enforceable limit
Violation per report: No
Typical source, per the report: Discharge from petroleum, glass, and metal refineries; discharge from mines and chemical manufacturers; runoff from livestock lots (feed additive), Erosion of natural deposits
PRIMARY DRINKING WATER STANDARDS - Inorganic Chemicals · report p. 13 · official report
Total haloacetic acids (THAA)
The utility reported: 18 ppb
Reported range: ND-21
Legal limit (MCL): 60
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
PRIMARY DRINKING WATER STANDARDS - Disinfection Byproducts · report p. 13 · official report
Total trihalomethane (TTHM)
The utility reported: 47 ppb
Reported range: 2.5-63
Legal limit (MCL): 80
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
PRIMARY DRINKING WATER STANDARDS - Disinfection Byproducts · report p. 13 · official report
Total chlorine
The utility reported: 1.9 ppm
Reported range: 0.20-3.2
MRDL: 4 · Health goal (MRDLG): 4 — not an enforceable limit
Violation per report: No
Typical source, per the report: Drinking water disinfectant added for treatment
PRIMARY DRINKING WATER STANDARDS - Disinfectants · report p. 13 · official report
Combined filter effluent (CFE) turbidity
The utility reported: 0.06 NTU
Reported range: 100% <= 0.3
TT: TT
Violation per report: No
Typical source, per the report: Soil runoff
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 16 · official report
Total coliform bacteria
The utility reported: 0.08 % Positive Monthly Samples
Reported range: 0-0.5
TT: TT · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Human and animal waste
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 16 · official report
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 (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 16 · official report
Gross beta particle activity
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND-6
Legal limit (MCL): 50 · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Decay of natural and manmade deposits
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 16 · official report
Radium-228
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND-1
Violation per report: No
Typical source, per the report: Erosion of natural deposits
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Mills Plant · report p. 16 · official report
Combined radium-226 + 228
The utility reported: Not detected at the report's stated reporting limit pCi/L
Reported range: ND-1
Legal limit (MCL): 5 · Health goal (PHG): 0 — not an enforceable limit
Violation per report: No
Typical source, per the report: Erosion of natural deposits
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Mills Plant · report p. 16 · official report
Uranium
The utility reported: 2 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
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 16 · official report
Aluminum
The utility reported: 0.096 ppm
Reported range: ND-0.1
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
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 17 · official report
Barium
The utility reported: 0.129 ppm
Reported range: 0.129
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, Discharges of oil-drilling waste and from metal refineries
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 17 · official report
Fluoride
The utility reported: 0.7 ppm
Reported range: 0.2-0.8
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, Water additive that promotes strong teeth; discharge from fertilizer and aluminum factories
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 17 · official report
Total trihalomethane (TTHM)
The utility reported: 33 ppb
Reported range: 9.8-55
Legal limit (MCL): 80
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 17 · official report
Sum of five haloacetic acids (HAA5)
The utility reported: 9.4 ppb
Reported range: ND-18
Legal limit (MCL): 60
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Distribution System · report p. 17 · official report
Bromate
The utility reported: 3.0 ppb
Reported range: ND-12
Legal limit (MCL): 10 · Health goal (PHG): 0.1 — not an enforceable limit
Violation per report: No
Typical source, per the report: Byproduct of drinking water disinfection
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 17 · official report
Total organic carbon (TOC)
The utility reported: 2.5 ppm
Reported range: 1.6-2.8
TT: TT
Violation per report: No
Typical source, per the report: Various natural and manmade sources
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 17 · official report
California Water Service - Rancho Dominguez District (Dominguez System) — unregulated monitoring and secondary (aesthetic) records (17)
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, apparent
The utility reported: 1.6 CU
Reported range: ND-20
Typical source, per the report: Naturally occurring organic materials
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Specific conductance
The utility reported: 475 US
Reported range: 110-910
Typical source, per the report: Seawater influence, Substances that form ions when in water
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Manganese
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND-35
Typical source, per the report: Runoff/leaching from natural deposits
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Odor
The utility reported: Not detected at the report's stated reporting limit T.O.N.
Reported range: ND-2.0
Typical source, per the report: Naturally occurring organic materials
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Turbidity (groundwater)
The utility reported: 0.22 NTU
Reported range: ND-3.1
Typical source, per the report: Soil runoff
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Boron
The utility reported: 0.13 ppm
Reported range: 0.11-0.16
Typical source, per the report: Unregulated constituents with no source listed
STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Groundwater · report p. 14 · official report
N-nitrosodimethylamine (NDMA)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND
Typical source, per the report: Unregulated constituents with no source listed
STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Groundwater · report p. 14 · official report
Perfluorhexanesulfonic acid (PFHxS)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND-3.6
Typical source, per the report: Unregulated constituents with no source listed
STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Groundwater · report p. 14 · official report
Potassium
The utility reported: 2.8 ppm
Reported range: 1.1-6.6
Typical source, per the report: Unregulated constituents with no source listed
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Aluminum
The utility reported: 96 ppb
Reported range: ND-100
Typical source, per the report: Runoff/leaching from natural deposits, Seawater influence
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Color
The utility reported: 1 UNITS
Reported range: 1
Typical source, per the report: Naturally occurring organic materials
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Specific conductance
The utility reported: 868 µS/cm
Reported range: 754-981
Typical source, per the report: Seawater influence, Substances that form ions when in water
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Boron
The utility reported: 0.13 ppm
Reported range: 0.13
Typical source, per the report: Unregulated constituents with no source listed
WHOLESALER DATA - STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Distribution System · report p. 18 · official report
Chlorate
The utility reported: 31 ppb
Reported range: 31
Typical source, per the report: Unregulated constituents with no source listed
WHOLESALER DATA - STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Distribution System · report p. 18 · official report
N-nitrosodimethylamine (NDMA)
The utility reported: Not detected at the report's stated reporting limit ppt
Reported range: ND-2.8
Typical source, per the report: Unregulated constituents with no source listed
WHOLESALER DATA - STATE-REGULATED CONTAMINANTS WITH NOTIFICATION LEVELS - Distribution System · report p. 18 · official report
Lithium
The utility reported: 34 ppb
Reported range: 27-41
Typical source, per the report: Unregulated constituents with no source listed
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Potassium
The utility reported: 4.4 ppm
Reported range: 3.8-5
Typical source, per the report: Unregulated constituents with no source listed
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
City of Lomita Water Dept — regulated contaminants reported as detected (0)
No itemized regulated-detection records were extracted from this provider's reviewed report. That is a limit of the extraction, not a claim that nothing was detected — the official report linked below is authoritative.
The Three C's — 3 of 3
Corrosion
What conditions could influence pipes, fixtures, and a water heater?
City of Torrance Municipal Water Utility
Chloride
The utility reported: 121.5 ppm
Reported range: 81-160
Reported constituent · report p. [5] · official report
Sulfate
The utility reported: 246.8 ppm
Reported range: 52-290
Reported constituent · report p. [5] · official report
Copper
The utility reported: 0.17 ppm
Reported range: ND-0.44
Reported constituent · report p. [5] · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
Reported range: ND-ND
Reported constituent · report p. [5] · official report
Gross Alpha Particle Activity
The utility reported: 0.04 pCi/L
Reported range: ND-2.95
Typical source, per the report: Erosion of natural deposits
Reported constituent · report p. [4] · official report
California Water Service - Rancho Dominguez District (Dominguez System)
pH
The utility reported: 8.0 Units
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
pH
The utility reported: 8.2 Units
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Alkalinity (total)
The utility reported: 157 ppm
UNREGULATED COMPOUNDS AND UNREGULATED CONTAMINANT MONITORING RULE (UCMR) - Groundwater · report p. 15 · official report
Alkalinity (total)
The utility reported: 110 ppm
WHOLESALER DATA - UNREGULATED COMPOUNDS - Distribution System · report p. 19 · official report
Chloride
The utility reported: 48 ppm
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Chloride
The utility reported: 92 ppm
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Sulfate
The utility reported: 29 ppm
SECONDARY DRINKING WATER STANDARDS - Groundwater · report p. 14 · official report
Sulfate
The utility reported: 176 ppm
WHOLESALER DATA - SECONDARY DRINKING WATER STANDARDS - Distribution System · report p. 18 · official report
Lead
The utility reported: Not detected at the report's stated reporting limit ppb
PRIMARY DRINKING WATER STANDARDS - Lead and Copper · report p. 13 · official report
Copper
The utility reported: 0.307 ppm
PRIMARY DRINKING WATER STANDARDS - Lead and Copper · report p. 13 · 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
WHOLESALER DATA - PRIMARY DRINKING WATER STANDARDS - Weymouth Plant · report p. 16 · official report
City of Lomita Water Dept
Corrosion-related inputs (such as pH or alkalinity) were not itemized in this provider's reviewed 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 Torrance Municipal Water Utility
Annual Water Quality Report · data year 2025 · Older retained data; verify the latest publication before republishing
View the 2025 City of Torrance Municipal Water Utility Consumer Confidence Report (PDF)Source water, per the report: Torrance purchased 68 percent of its total potable water supply from the Metropolitan Water District of Southern California (MWD), a regional wholesaler of imported surface water originating from the Colorado River and Northern California. The remaining 32 percent of the municipal potable water supply came from three operating wells pumping from the West Coast Groundwater Basin and from a groundwater desalination project.
Official report — California Water Service - Rancho Dominguez District (Dominguez System)
2025 Water Quality Report · data year 2025 · Current 2025 monitoring cycle
View the 2025 California Water Service - Rancho Dominguez District (Dominguez System) Consumer Confidence ReportSource water, per the report: Uses a combination of local groundwater and surface water purchased from Metropolitan Water District of Southern California (MWD), which is obtained from the Colorado River and the State Water Project in northern California. The Dominguez water system currently includes 10 active wells and seven MWD connections.
Official report — City of Lomita Water Dept
Consumer Confidence Report Electronic Delivery Certification · data year 2024 · 2024 data retained; monitor for the next official update
View the 2024 City of Lomita Water Dept Consumer Confidence ReportNearby 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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