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

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

Chowchilla Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

7.7

neutral = 7.0

Lead

0.005 mg/L

✓ Below action level

TDS

276.4 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 Chowchilla, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Chowchilla	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 Chowchilla compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Chowchilla, California	≈ 120–179 mg/L	4.5 ppt	🟠 Hard	groundwater
Madera, California	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Merced, California	≈ 120–179 mg/L	124.6 ppt	🟠 Hard	groundwater
Mendota, California	≈ 180+ mg/L	0 ppt	🔴 Very Hard	groundwater
Atwater, California	≈ 120–179 mg/L	435.3 ppt	🟠 Hard	groundwater

National Benchmark

How Chowchilla compares to the USA average

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

Local geology and source profile

Source: GroundwaterTDS: 276.4 mg/LpH: 7.7

The Chowchilla City Water Department, located at 130 S. Second Street, Chowchilla, CA 93610, serves the city in Madera County within California's Central Valley. The utility draws its supply entirely from groundwater wells in the critically overdrafted Chowchilla Subbasin, managed under the Sustainable Groundwater Management Act (SGMA) by local Groundwater Sustainability Agencies (GSAs). No surface water reservoirs or rivers are used; treatment involves disinfection and basic conditioning at city facilities. The subbasin was returned to Department of Water Resources (DWR) jurisdiction in June 2025 following improvements to GSA plans. The utility complies with Safe Drinking Water Act standards per its annual Consumer Confidence Report (CCR).

The Chowchilla Subbasin lies within the greater San Joaquin Valley watershed, fed by snowmelt and runoff from the Sierra Nevada. Water infiltrates alluvial fans into a shallow aquifer system, part of the Madera-Chowchilla–Kings basin complex. The geology features Quaternary alluvial deposits — sands, gravels, silts, and clays derived from Sierra Nevada weathering — over older Tertiary marine and continental sediments, including the Corcoran Clay confining layer. Dissolution of limestone and dolomite fragments within these alluvial deposits, along with evaporitic minerals in underlying formations, imparts a hard character to the groundwater.

Hard water in Chowchilla causes scale buildup in pipes, water heaters, dishwashers, washing machines, and especially kettles and coffee makers. White deposits on fixtures and soap scum increase cleaning needs, and heating element scaling can raise energy costs by 20–30%. Monthly vinegar descaling, installing sediment filters, and using high-efficiency detergents are recommended. A water softener is advised for households with daily use. Potential concerns include naturally elevated total dissolved solids, antimony traces, and agricultural runoff nitrates; no PFAS specifics are available, but annual CCR checks are recommended.

Geology & Source: Chowchilla Subbasin, San Joaquin Valley; Pleistocene–Holocene alluvial sands and gravels over Tertiary sediments with Corcoran Clay — limestone and dolomite fragments dissolve, producing hard groundwater

Other California Water Reports

Madera

≈ 120–179 mg/L

🟠 Hard

Merced

≈ 120–179 mg/L

🟠 Hard

Mendota

≈ 180+ mg/L

🔴 Very Hard

Atwater

≈ 120–179 mg/L

🟠 Hard

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Frequently Asked Questions

Is Chowchilla's water safe to drink?

Yes. Chowchilla'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 Chowchilla?

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

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