How does San Fernando's water compare to the national average?

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

San Fernando Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

groundwater

pH Level

8.2

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

552.6 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 San Fernando, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In San Fernando	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 San Fernando compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ San Fernando, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Sylmar, California	≈ 180+ mg/L	4.4 ppt	🔴 Very Hard	mixed
North Hills, California	≈ 120–179 mg/L	6.9 ppt	🟠 Hard	mixed
Shadow Hills, California	33.5 mg/L	2.9 ppt	🟢 Soft	mixed
Van Nuys, California	≈ 120–179 mg/L	3.9 ppt	🟠 Hard	mixed

National Benchmark

How San Fernando compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ San Fernando	≈ 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 San Fernando's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 552.6 mg/LpH: 8.2

San Fernando, California is served by the Los Angeles Department of Water and Power (LADWP), which supplies water to the San Fernando Valley service area. The primary water source is the San Fernando Valley Groundwater Basin, a major aquifer system providing the majority of the region's drinking water. LADWP operates combined wells throughout the valley and treats water at multiple facilities before distribution to residential and commercial customers. Customers with water quality concerns can contact LADWP's Water Quality Hotline at (213) 367-3182.

The San Fernando Valley Groundwater Basin is situated within the Los Angeles Basin and comprises Quaternary alluvial deposits and older Tertiary sedimentary formations overlying Cretaceous bedrock. The aquifer system is recharged through natural percolation and imported surface water. As groundwater flows through mineral-rich alluvial and sedimentary strata, it dissolves significant quantities of calcium and magnesium — the primary minerals responsible for hardness. This geological setting, characteristic of Southern California's coastal basins, naturally produces a very hard water supply.

Very hard water in San Fernando causes noticeable scaling on fixtures, reduced soap effectiveness, and accelerated wear on water heaters and appliances. White mineral deposits on faucets and showerheads, reduced lather in showers and laundry, and shortened appliance lifespans are typical. A water softener is strongly recommended to protect plumbing, extend appliance life, and improve cleaning efficiency. LADWP's 2023 Drinking Water Quality Report reports total hardness of 103 mg/L (as CaCO₃); the water meets all federal and state standards. Geosmin, a harmless natural compound from algae, occasionally causes a musty odour but can be removed with carbon filtration.

Geology & Source: San Fernando Valley Groundwater Basin; Quaternary alluvial deposits over Tertiary sedimentary formations, Cretaceous bedrock; mineral-rich strata dissolve elevated calcium and magnesium into groundwater — very hard supply

Other California Water Reports

Sylmar

≈ 180+ mg/L

🔴 Very Hard

North Hills

≈ 120–179 mg/L

🟠 Hard

Shadow Hills

33.5 mg/L

🟢 Soft

Van Nuys

≈ 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 San Fernando's water safe to drink?

Yes. San Fernando'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 San Fernando?

At ≈ 180+ mg/L (Very Hard), San Fernando'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 San Fernando compare to the USA average?

The USA national average is 151 mg/L. San Fernando (≈ 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 San Fernando 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.