How does North Hills's water compare to the national average?

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

North Hills Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

mixed

pH Level

8.2

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

520.2 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 North Hills, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In North Hills	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 North Hills compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ North Hills, California	≈ 120–179 mg/L	6.9 ppt	🟠 Hard	mixed
Northridge, California	≈ 120–179 mg/L	5.1 ppt	🟠 Hard	mixed
Van Nuys, California	≈ 120–179 mg/L	3.9 ppt	🟠 Hard	mixed
Reseda, California	≈ 120–179 mg/L	3 ppt	🟠 Hard	mixed
San Fernando, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater

National Benchmark

How North Hills compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ North Hills	≈ 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 North Hills's Water Unique?

Local geology and source profile

Source: MixedTDS: 520.2 mg/LpH: 8.2

The Los Angeles Department of Water and Power (LADWP) provides water service to North Hills, located in the San Fernando Valley of Los Angeles County, California. Primary sources include the Los Angeles Aqueduct delivering imported surface water from the Owens Valley, local groundwater extracted from San Fernando Valley wells, and blended supplies from the Metropolitan Water District of Southern California (MWD), which manages the Colorado River Aqueduct and State Water Project. Treatment occurs at LADWP facilities with filtration, disinfection, and blending to meet demand for this urban residential area.

The supply originates from the Owens Valley watershed in the Sierra Nevada, where precipitation filters through granitic batholiths and Paleozoic carbonate formations including limestones and dolomites before conveyance via aqueduct. Local groundwater taps the San Fernando Groundwater Basin, an alluvial aquifer formed by Quaternary sediments from surrounding mountains, with underlying Miocene marine shales and sandstones of the Topanga and Fernando Formations. This geology imparts a hard character to the mixed supply through mineral dissolution from carbonate-rich strata and basin evaporites, resulting in elevated natural mineralisation.

Hard water in North Hills leads to scale buildup in pipes and hot water systems, and affects water heaters, dishwashers, and washing machines by shortening their lifespan through mineral deposits that increase energy consumption. Soap lathering is reduced, requiring more detergent, and dry skin or spotted dishes may result. Regular maintenance including vinegar descaling and installing drain screens is recommended, and a water softener is advisable to mitigate these effects. LADWP conducts regular testing in compliance with EPA and State Water Resources Control Board standards; treatment involves coagulation, sedimentation, filtration, chlorination, and fluoridation, with annual Drinking Water Quality Reports maintained for public transparency.

Geology & Source: Los Angeles Aqueduct Sierra Nevada snowmelt through granitic and metamorphic terrains; San Fernando Valley Basin alluvial aquifers over Pleistocene–Holocene Fernando Formation sediments; Owens Valley limestones, dolomites, and evaporitic sediments

Other California Water Reports

Northridge

≈ 120–179 mg/L

🟠 Hard

Van Nuys

≈ 120–179 mg/L

🟠 Hard

Reseda

≈ 120–179 mg/L

🟠 Hard

San Fernando

≈ 180+ mg/L

🔴 Very 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 North Hills's water safe to drink?

Yes. North Hills'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 North Hills?

At ≈ 120–179 mg/L (Hard), North Hills'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 North Hills compare to the USA average?

The USA national average is 151 mg/L. North Hills (≈ 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 North Hills 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.