How does West Allis's water compare to the national average?

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

West Allis Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

reservoir

pH Level

7.8

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

70 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 West Allis, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In West Allis	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 West Allis compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ West Allis, Wisconsin	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Wauwatosa, Wisconsin	≈ 180+ mg/L	0 ppt	🔴 Very Hard	reservoir
Greenfield, Wisconsin	≈ 180+ mg/L	6.5 ppt	🔴 Very Hard	groundwater
Greendale, Wisconsin	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Milwaukee, Wisconsin	≈ 60–120 mg/L	10 ppt	🟡 Moderately Hard	river

National Benchmark

How West Allis compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ West Allis	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your West Allis home

Shop water softeners on Amazon.com →

Shop Now

What Makes West Allis's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 70 mg/LpH: 7.8

The City of West Allis Water Utility serves approximately 60,000 residents in West Allis and parts of Wauwatosa, Milwaukee County, Wisconsin. Water is sourced from Lake Michigan via the Milwaukee Metropolitan Sewerage District's intake system and treated at the Milwaukee Water Filtration Plant, which processes surface water through screening, coagulation, sedimentation, filtration, and disinfection before distribution through 250 miles of mains.

Lake Michigan forms the core of the Great Lakes watershed amid Precambrian bedrock exposures and Paleozoic carbonates. Glacial deposits from the Wisconsinan glaciation overlie Silurian dolomite and limestone layers, and dissolution of these carbonate-rich formations imparts elevated calcium and magnesium to the supply. The resulting water has a hard character typical of surface waters in limestone-dominated regions across the Great Lakes basin.

At this hard level, scale buildup accelerates in water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Faucets and fixtures develop stubborn deposits, and laundry feels stiff without extra detergent. Regular vinegar descaling and annual appliance checks help; a water softener is strongly recommended to extend equipment life. The utility maintains EPA compliance, with pH typically 7.5–8.5, no lead or copper violations, and TTHMs and other disinfection byproducts monitored below limits; chromium-6 traces to industrial legacy but stays under health guidelines.

Geology & Source: Lake Michigan source — Great Lakes watershed overlying Paleozoic Ordovician and Silurian dolomite and limestone bedrock; glacial drift and till incorporate carbonate minerals; calcium and magnesium dissolution produces hard water

Other Wisconsin Water Reports

Wauwatosa

≈ 180+ mg/L

🔴 Very Hard

Greenfield

≈ 180+ mg/L

🔴 Very Hard

Greendale

≈ 120–179 mg/L

🟠 Hard

Milwaukee

≈ 60–120 mg/L

🟡 Moderately 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 West Allis's water safe to drink?

Yes. West Allis'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 West Allis?

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

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