Milwaukee’s drinking water comes from Milwaukee Waterworks (EPA system WI2410100), which draws surface water from a river, lake or reservoir and treats it before distribution for about 626,000 people. EPA’s records associate 2 sizeable community systems with Milwaukee; Milwaukee Waterworks is the main one, and it is the system this page examines in depth. This page translates that system’s official EPA record — lead and copper results, violation history, and what the data does and does not say — into plain English.
This page is built entirely from the U.S. EPA’s Safe Drinking Water Information System (SDWIS), the same records state regulators use. We did not test Milwaukee’s water, and system-level data describes the utility’s water as a whole — not what comes out of one specific home’s tap. Where the record is silent, we say so rather than guess.
Key takeaways
- Milwaukee Waterworks supplies Milwaukee (Surface water); it serves about 626,000 people across its service area.
- Milwaukee Waterworks’s most recent reported 90th-percentile lead result is 5.3 ppb, below the EPA action level of 15 ppb.
- No health-based violations in the last 10 years of EPA records for Milwaukee Waterworks.
- EPA does not track hardness. If you’re shopping for a softener, test first and size from a real grains-per-gallon number.
The water system serving Milwaukee
Milwaukee Waterworks is the community water system the EPA associates with Milwaukee, Wisconsin. It reports a population served of about 626,000. It is flagged in EPA’s data as a wholesale supplier: it treats water and sells it on to local systems, which deliver it to homes. The record below is the wholesaler’s — your own system’s sampling can differ.
| System | EPA ID | People served | Source water | Role |
|---|---|---|---|---|
| Milwaukee Waterworks | WI2410100 | 626,000 | Surface water | Main system · wholesale supplier |
| Robert William Park Water Association INC | WI2410589 | 1,065 | Groundwater | Also serves the area |
Not sure which system serves your address? Run your ZIP code through our What’s In My Water? lookup — it resolves the systems EPA lists for your ZIP and shows the same records in full.
Lead and copper
Lead: Milwaukee Waterworks’s most recent reported 90th-percentile lead result is 5.3 ppb, below the EPA action level of 15 ppb.
Read those numbers carefully: a 90th percentile is a system-wide statistic from a sample of homes, not a test of your tap. Lead in drinking water comes mostly from a home’s own plumbing — service lines, solder and fixtures — so two houses on the same street can test very differently. Homes built before 1986 carry the highest risk, whatever the system average says.
Violation history — the last 10 years
EPA records show no health-based violations for Milwaukee Waterworks in the last 10 years. Health-based violations are the serious kind: a contaminant over its legal limit, a skipped treatment step, or a disinfectant level above its maximum.
The recent paperwork record is clean too: no monitoring or reporting items in the last 5 years.
What this means for your home
System data sets the background; your home’s plumbing writes the foreground. In practice:
- Lead deserves action here. A system 90th percentile of 5.3 ppb means sampled homes in this system do pick up lead. If your home predates 1986, a filter certified to NSF/ANSI 53 for lead — or a reverse osmosis system (NSF/ANSI 58) — is the standard fix; see our water filter guides and certified filter picks for what the certifications actually cover.
- Taste and smell: surface-water systems disinfect with chlorine or chloramine, which is most of what people taste. A basic carbon filter (NSF/ANSI 42) handles it; our chloramine vs chlorine explainer helps you tell which one your water has.
- Hardness is not in this record — by design. The EPA doesn’t track it, so nobody can honestly tell you your grains-per-gallon from this page. Scale on fixtures and shower doors is a hint, not a measurement. Test (strips are a start; a lab test is better — see how to test your water at home), then size any softener with our softener sizing calculator and the softener hub.
- On a private well instead of city water? None of this system’s record applies to your tap — start with our well water hub for the test-first approach.
Water quality in nearby cities
New York, NY · Los Angeles, CA · Houston, TX
This guide is one of our per-city water reports — see the full list on the Water Quality hub, alongside our contaminant explainers and testing guides.
Frequently asked questions
Is Milwaukee water safe to drink?
On the evidence in its EPA record, yes: Milwaukee Waterworks has no health-based violations in the last 10 years, and its most recent 90th-percentile lead result was 5.3 ppb, below the EPA action level of 15 ppb. Health-based violations are the serious category — the contamination and treatment failures — so a clean 10-year record is the strongest signal the federal data offers. Two honest limits: EPA data describes the system as a whole, not your tap, and lead in particular usually comes from a home’s own plumbing — a certified home test is the only way to know your exact water.
Where does Milwaukee get its drinking water?
Milwaukee Waterworks is the community water system the EPA associates with Milwaukee. It draws surface water from a river, lake or reservoir and treats it before distribution and serves about 626,000 people across its service area (EPA system ID WI2410100). 1 other sizeable system also report serving parts of Milwaukee — they are listed in the table above.
What is the lead level in Milwaukee’s water?
Milwaukee Waterworks’s most recent reported 90th-percentile lead result is 5.3 ppb, below the EPA action level of 15 ppb. That figure is a system statistic from sampled homes, not a test of your tap — your own plumbing decides your exposure, and a certified home test is the only way to know it.
Has Milwaukee’s water system had violations?
No health-based violations appear for Milwaukee Waterworks in the last 10 years of EPA records. Its recent monitoring and reporting record is clean as well.
Do I need a water filter in Milwaukee?
The clearest reason to filter in Milwaukee is lead from home plumbing, given the system’s 90th-percentile result. A filter certified to NSF/ANSI 53 for lead (or reverse osmosis, NSF/ANSI 58) is the standard answer. For everything else, match the tool to a measured problem — hardness included — rather than buying for a list of fears.
Source: U.S. EPA SDWIS via Envirofacts, retrieved November 11, 2026. System-level data describes the utility’s water, not any individual tap. If your water bill names a different system, that system’s record is the one that applies to you.