Milwaukee, WI
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Milwaukee in Wisconsin · Population: 927,656
Milwaukee, WI is tracked across three EPA datasets covering 50 Toxics Release Inventory (TRI) facilities, 40 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 72/100 (High Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 9.8M lbs of reported toxic releases under EPCRA Section 313, while 11 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 43 and a peak AQI of 147 in 2024, with 69% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 251 (69%) | 109 | 6 | 147 |
| 2023 | 166 (45%) | 180 | 15 | 250 |
| 2022 | 192 (53%) | 167 | 6 | 143 |
| 2021 | 162 (44%) | 196 | 7 | 129 |
| 2020 | 204 (56%) | 157 | 4 | 169 |
Source: EPA Air Quality System (AQS) Annual AQI by County EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Wisconsin, see the EPA's AirNow.gov.
Water Systems (40)
| System | Population | Violations |
|---|---|---|
| MILWAUKEE WATERWORKS | 626,000 | 0 |
| WEST ALLIS WATERWORKS | 63,240 | 0 |
| WAUWATOSA WATERWORKS | 49,064 | 0 |
| NORTH SHORE WATER COMMISSION | 35,598 | 0 |
| OAK CREEK WATERWORKS | 32,104 | 5 |
| FRANKLIN WATER UTILITY | 22,500 | 0 |
| SOUTH MILWAUKEE WATERWORKS | 21,340 | 0 |
| CUDAHY WATERWORKS | 18,659 | 0 |
| GREENDALE WATERWORKS | 14,393 | 0 |
| WHITEFISH BAY WATERWORKS | 14,272 | 0 |
| SHOREWOOD WATERWORKS | 13,535 | 1 |
| GLENDALE WATERWORKS | 12,883 | 0 |
| BROWN DEER WATERWORKS | 12,741 | 0 |
| FOX POINT WATERWORKS | 6,808 | 1 |
| ROBERT WILLIAM PARK WATER ASSOCIATION INC | 1,065 | 0 |
| HALES HAPPINESS SUBDIVISION | 400 | 1 |
| PIONEER ESTATES OF DELAVAN | 400 | 0 |
| BEECHWOOD FARMS ESTATES | 300 | 0 |
| BROWNS LAKE MOBILE HOME CT | 225 | 0 |
| MAPLEWOOD VILLAGE | 225 | 0 |
| WHITNALL GARDEN APARTMENTS | 200 | 0 |
| LAKEWOOD VILLAGE | 160 | 0 |
| EMERALD WOODS CONDOS | 150 | 1 |
| OAKTON BEACH | 144 | 0 |
| LAUREL LAKES 608 | 80 | 0 |
| GRAND AVE APARTMENTS | 80 | 1 |
| LINDEN LANE APTS 141 | 75 | 0 |
| ALLEN ESTATES LLC | 75 | 0 |
| WILLIAMSBURG 207 209 AND 214 | 70 | 3 |
| LAKEVIEW HEIGHTS MOBILE HOME PARK | 66 | 0 |
| MEADOWS CONDOMINIUMS ASSOC LTD | 50 | 0 |
| LAUREL LAKES 508 | 50 | 0 |
| WILLIAMSBURG 206 | 48 | 1 |
| PARKVIEW APARTMENTS | 45 | 8 |
| HEIDEL RD APTS 139 | 40 | 3 |
| HEIDEL RD APTS 152 | 40 | 0 |
| LINCOLN CREST APARTMENTS | 32 | 0 |
| WILLIAMSBURG 220 | 32 | 0 |
| ROSEMORE VILLAGE | 32 | 0 |
| RIVER GARDEN APTS | 25 | 2 |
TRI Facilities (50)
Cities in Milwaukee (11)
Frequently Asked Questions
What is the environmental risk level in Milwaukee, Wisconsin? ▼
Are there Superfund sites in Milwaukee? ▼
How many toxic release facilities are in Milwaukee? ▼
What is the air quality in Milwaukee? ▼
Is the drinking water safe in Milwaukee? ▼
What environmental agencies cover Milwaukee? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.