How does Lomita's water compare to the national average?

The USA national average is 151 mg/L. Lomita (≈ 180+ mg/L) is 189 mg/L harder than average.

Lomita Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

313.5 mg/L

Est. Daily Cost

$0.91

energy & soap waste

Source: See methodology section below · Updated 2026

very hard180+ mg/LVery Hard · 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 Lomita, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Lomita	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 Lomita compares to its nearest neighbours

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

National Benchmark

How Lomita compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Lomita	≈ 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 Lomita's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 313.5 mg/LpH: 7.8

The City of Lomita Water System serves approximately 20,000 residents in Lomita, Los Angeles County, California. The utility blends 35–40% groundwater pumped from the West Coast Basin aquifer with 60–65% imported surface water purchased from the West Basin Municipal Water District, which sources from the Metropolitan Water District of Southern California (MWD). Primary imported supplies originate from the Colorado River via the Colorado River Aqueduct and Northern California via the State Water Project (California Aqueduct). Water undergoes conventional treatment including coagulation, flocculation, sedimentation, filtration, and disinfection prior to distribution.

The supply spans diverse watersheds: the Colorado River Basin draining arid plateaus and the Sierra Nevada for State Water Project sources, alongside the local Los Angeles Basin groundwater. The West Coast Basin features unconfined and confined aquifers in Quaternary alluvium overlying Tertiary marine sediments including the calcareous San Pedro Formation. Imported water contacts Paleozoic limestones and dolomites in the Colorado River headwaters and weathers granitic Sierra terrain — this mineral-prone geology imparts a hard character through natural dissolution of calcium and magnesium from carbonate and sedimentary formations.

Very hard water promotes significant scale buildup in dishwashers (causing white spots on glassware), water heaters, coffee makers, and faucets. Showerheads and bathtubs develop white films, and laundry shows reduced soap lathering. Regular maintenance includes monthly vinegar descaling for fixtures, scale-inhibiting showerheads, and annual hot water heater flushing. A water softener is recommended to mitigate deposits, enhance cleaning efficiency, and extend appliance life. The 2025 Consumer Confidence Report is available at www.LomitaWater.com/CCR2025; contact (310) 325-7110 for details. Imported water receives advanced MWD processing including oxidation, filtration, and chloramination.

Geology & Source: West Coast Basin aquifer — Quaternary alluvium and San Pedro Formation (Pleistocene); imported Colorado River water contacts Paleozoic limestone/dolomite karst; Sierra Nevada granitic sources blended — hard mineralized supply

Other California Water Reports

West Carson

≈ 120–179 mg/L

🟠 Hard

Torrance

≈ 180+ mg/L

🔴 Very Hard

Carson

≈ 180+ mg/L

🔴 Very Hard

Wilmington

≈ 120–179 mg/L

🟠 Hard

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

Frequently Asked Questions

Is Lomita's water safe to drink?

Yes. Lomita's water meets all federal safety standards. The hardness is ≈ 180+ mg/L (Very Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Lomita?

At ≈ 180+ mg/L (Very Hard), Lomita'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 45%.

How does Lomita compare to the USA average?

The USA national average is 151 mg/L. Lomita (≈ 180+ mg/L) is 189 mg/L above the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Lomita 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.