A92/100
West Allis Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 63,240 residents · Wisconsin
What's In West Allis's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2014.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
WEST ALLIS WATERWORKS
Population Served
63,240
Water Source
Purchased Surface Water
System ID
WI2410595
Frequently Asked Questions About West Allis Water
Is West Allis tap water safe to drink?
West Allis, Wisconsin tap water receives a grade of A (92/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in West Allis's water?
Of the 69 contaminants tested in West Allis's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does West Allis have any water quality violations?
Yes, West Allis has 5 EPA violation(s) on record, with the most recent in 2014. Violation types include Other, MR. None of these are classified as health-based violations.
Do I need a water filter in West Allis?
West Allis water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does West Allis's tap water come from?
West Allis's drinking water is sourced from purchased surface water and supplied by WEST ALLIS WATERWORKS. The system serves approximately 63,240 people. Surface water sources include rivers, lakes, and reservoirs.
How often is West Allis's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. West Allis's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does West Allis's water compare to other cities in Wisconsin?
West Allis's water quality score of 92/100 earns a grade of A, which is considered excellent. This places West Allis among the better-performing water systems in Wisconsin. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about West Allis's water quality?
If you have concerns about West Allis's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (WEST ALLIS WATERWORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.