Milwaukee Waterworks
Milwaukee, Wisconsin · PWSID: WI2410100
Milwaukee Water Quality Summary
Milwaukee Waterworks supplies drinking water to about 626,000 people in Milwaukee, Wisconsin, and draws from surface water (rivers, lakes, or reservoirs), which requires fuller treatment for runoff, sediment, and microbial risk. On the IsWaterSafe scale it earns an excellent Water Safety Score of 97 out of 100 (Grade A), a composite of its EPA SDWIS violation and contaminant record.
EPA SDWIS shows no health-based or monitoring violations on record for Milwaukee Waterworks, though 1 enforcement action is logged in its history.
Across the 2 substances sampled, none exceeded its EPA limit. Combined Filter Effluent sits highest relative to its ceiling, detected at 0.5 NTU against an MCL of 1 NTU (sampled March 2023) — within the legal limit.
The most pressing open issue is a monitoring violation involving Combined Filter Effluent, beginning June 2023 and still open in EPA records.
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Detected Contaminants
| Contaminant | Detected Level | MCL (Limit) | Status | Sample Date |
|---|---|---|---|---|
| Combined Filter Effluent | 0.5 NTU | 1 NTU | Within Limit | Mar 24, 2023 |
| Benzene | 2.5 ppb | 5 ppb | Within Limit | Jan 1, 2023 |
Violation History
Frequently Asked Questions
Milwaukee Waterworks has a Water Safety Score of A (97/100). The system serves 626,000 people and has 0 health violations on record. Check the contaminant table above for specific detected substances.
Milwaukee Waterworks has 0 contaminant exceedances above EPA health guidelines. See the full contaminant detection table above for all tested substances and their levels relative to legal limits and health guidelines.
The Water Safety Score (0-100, grades A through F) is based on contaminant levels relative to legal limits, health guideline exceedances, violation history, and enforcement actions. Higher scores indicate fewer concerns.
If your water system has violations, request the Consumer Confidence Report from your utility, consider getting an independent water test from a certified lab, and look into certified water filters for specific contaminants of concern. For lead, run cold water for 30 seconds before drinking.
Water quality data sourced from EPA's Safe Drinking Water Information System (SDWIS). Safety scores are calculated based on contaminant levels, violations, and enforcement history. This is not a substitute for your utility's official Consumer Confidence Report.
Source: EPA Ground Water and Drinking Water, 2026.