Carson Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
mixed
pH Level
7.9
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
381.2 mg/L
Est. Daily Cost
$0.91
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Carson, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Carson | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Carson compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Carson, California | ≈ 180+ mg/L | 5.9 ppt | 🔴 Very Hard | mixed |
| West Carson, California | ≈ 120–179 mg/L | 3.2 ppt | 🟠 Hard | mixed |
| Lomita, California | ≈ 180+ mg/L | 8.4 ppt | 🔴 Very Hard | reservoir |
| Wilmington, California | ≈ 120–179 mg/L | 6.7 ppt | 🟠 Hard | mixed |
| Torrance, California | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Carson compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Carson | ≈ 180+ mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Carson's Water Unique?
Local geology and source profile
California Water Service Company (Cal Water) provides water to Carson, California through its Dominguez System, serving approximately 418,833 people in Los Angeles County. The supply is a blended mix of local groundwater from Dominguez basin wells and imported surface water from the Metropolitan Water District of Southern California (MWD), sourced via the Colorado River Aqueduct and California State Water Project. In 2023, the utility conducted 20,269 tests on 4,113 samples across 237 constituents, meeting all primary and secondary state and federal standards with no MCL violations reported. Treatment includes disinfection, blending, and pH adjustment across the mixed sources.
The Dominguez System draws from the Los Angeles coastal plain watershed, where groundwater originates in the Dominguez basin amid Quaternary alluvium overlying Tertiary sedimentary rocks including the Fernando Formation — Pliocene-Miocene marine shales and sandstones. Limestone-influenced lithologies and evaporitic minerals contribute dissolved calcium and magnesium, yielding a hard supply. Imported water arrives via the Colorado River Aqueduct and State Water Project, traversing Sierra Nevada granites and desert basins, adding further mineral content that reinforces the overall hard character of the blended supply.
Very hard water in Carson causes significant scale buildup in pipes, fixtures, water heaters, dishwashers, washing machines, and coffee makers, reducing efficiency and lifespan. White spots on glassware, soap scum, and increased detergent use are common household issues. Annual deliming of heaters, installing scale inhibitors, and using high-efficiency appliances are recommended; a water softener is strongly advised for households. Water quality meets standards with 4 contaminants above EPA health guidelines per third-party analysis; PFAS presence and potential lead from older pipes prompt filter recommendations. The utility ensures lead and copper compliance via corrosion control.
Geology & Source: Dominguez basin, Los Angeles; Quaternary alluvium over Tertiary Fernando Formation marine shales and sandstones; limestone lithologies and evaporitic minerals yield hard groundwater; Colorado River Aqueduct imports add further mineral content
Other California Water Reports
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Frequently Asked Questions
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How does Carson compare to the USA average?
Data Sources & Methodology
Water quality data for Carson is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.