How does West Carson's water compare to the national average?

The USA national average is 151 mg/L. West Carson (≈ 120–179 mg/L) is 1 mg/L softer than average.

West Carson Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

mixed

pH Level

7.3

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

96.7 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · est.

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 West Carson, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In West Carson	Soft Water City	Efficiency Loss
Kettle	6.8 yrs	8.5 yrs	-20%
Washing Machine	9.6 yrs	12 yrs	-20%
Water Heater	12 yrs	15 yrs	-20%

Regional Water Comparison

How West Carson compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ West Carson, California	≈ 120–179 mg/L	3.2 ppt	🟠 Hard	mixed
Carson, California	≈ 180+ mg/L	5.9 ppt	🔴 Very Hard	mixed
Lomita, California	≈ 180+ mg/L	8.4 ppt	🔴 Very Hard	reservoir
Torrance, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	reservoir
Wilmington, California	≈ 120–179 mg/L	6.7 ppt	🟠 Hard	mixed

National Benchmark

How West Carson compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ West Carson	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes West Carson's Water Unique?

Local geology and source profile

Source: MixedTDS: 96.7 mg/LpH: 7.3

West Carson, an unincorporated community in Los Angeles County, California, receives its water from California Water Service Company's Dominguez System, serving approximately 48,000 customers across parts of Carson, West Carson, and nearby areas. Primary sources include local groundwater from the Central Basin aquifers, supplemented by imported surface water via the Metropolitan Water District from the Colorado River (Lake Mathews via Diemer Filtration Plant) and the State Water Project (Castaic Lake). Treatment occurs at utility facilities and the Metropolitan Water District's advanced plants, including filtration, disinfection, and corrosion control.

The supply originates from the Dominguez Channel watershed and broader Los Angeles Basin hydrology, with groundwater from the Central Groundwater Basin underlain by sedimentary formations of the Pico, Repetto, and Fernando Groups (Pliocene to Pleistocene) — including marine sandstones, shales, and limestones that impart a hard character through natural dissolution of alkaline earth minerals. Imported surface waters traverse the Transverse Ranges and Mojave Desert, contacting evaporitic soils and carbonate-rich terrains, enhancing mineralization before blending into the local distribution system.

Hard water in West Carson promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan; white residue on fixtures and glassware is common, along with poorer soap lathering. Regular vinegar descaling, scale-inhibiting showerheads, and annual flushing of water heaters help mitigate effects; a water softener is recommended for households experiencing significant scaling. The Dominguez System's 2023 CCR reports average pH of 7.8–8.2, with lead and copper rule compliance, 90th percentile copper at 0.15 mg/L (below the 1.3 mg/L action level), no PFAS detections above EPA limits, and treatment including coagulation, dual-media filtration, ozonation, chloramination, and fluoride addition.

Geology & Source: Dominguez groundwater basin — Quaternary alluvial sediments over Pliocene-Pleistocene Pico, Repetto, Fernando Groups (marine sandstones, shales, limestones); imported Colorado River and State Water Project water adds mineralization across arid

Other California Water Reports

Carson

≈ 180+ mg/L

🔴 Very Hard

Lomita

≈ 180+ mg/L

🔴 Very Hard

Torrance

≈ 180+ mg/L

🔴 Very Hard

Wilmington

≈ 120–179 mg/L

🟠 Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is West Carson's water safe to drink?

Yes. West Carson's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in West Carson?

At ≈ 120–179 mg/L (Hard), West Carson's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does West Carson compare to the USA average?

The USA national average is 151 mg/L. West Carson (≈ 120–179 mg/L) is 1 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for West Carson is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.