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

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

Delhi Water Hardness & Quality Report (2026)

Water Hardness

very hard

180+ mg/L

Very Hard

estimated · not lab-verified

Source

groundwater

pH Level

neutral = 7.0

Lead

0.007 mg/L

✓ Below action level

TDS

438.4 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 Delhi, your appliances are currently losing 45% efficiency due to mineral buildup.

Appliance	In Delhi	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 Delhi compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Delhi, California	≈ 180+ mg/L	15.3 ppt	🔴 Very Hard	groundwater
Livingston, California	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Turlock, California	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Winton, California	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Atwater, California	≈ 120–179 mg/L	435.3 ppt	🟠 Hard	groundwater

National Benchmark

How Delhi compares to the USA average

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

Local geology and source profile

Source: GroundwaterTDS: 438.4 mg/LpH: 8

Delhi County Water District provides the community of Delhi, California, with water drawn exclusively from local groundwater wells. These wells tap into the San Joaquin Valley groundwater basin, a vast underground system serving the area. While specific treatment plant names aren't detailed in current reports, the district confirms its supply meets all EPA standards. The water originates from the Central Valley groundwater basin, a significant alluvial plain.

The geology beneath Delhi is characterized by thick layers of sand, gravel, silt, and clay. These sediments, originating from the erosion of the Sierra Nevada, contain carbonate-rich minerals. As water percolates through these formations, it dissolves calcium and magnesium ions, a process common in valley groundwater influenced by semi-arid conditions and evaporative concentration, leading to a hard water supply.

Homeowners in Delhi will likely notice significant scale buildup in pipes, which can reduce water flow over time. Appliances like water heaters, dishwashers, and coffee makers are particularly susceptible to shortened lifespans due to insulating scale deposits. You might also see white deposits on faucets and fixtures, and laundry may feel stiff even with extra detergent. Regular descaling of fixtures with vinegar and annual flushing of water heaters are recommended. Given the intense hardness, installing a water softener is strongly advised to combat these effects.

Geology & Source: San Joaquin Valley alluvial aquifer; Pleistocene to Holocene sediments with carbonate minerals produce hard water

Other California Water Reports

Livingston

≈ 120–179 mg/L

🟠 Hard

Turlock

≈ 120–179 mg/L

🟠 Hard

Winton

≈ 120–179 mg/L

🟠 Hard

Atwater

≈ 120–179 mg/L

🟠 Hard

Report an Issue

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 Delhi's water safe to drink?

Yes. Delhi'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 Delhi?

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

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