Ozaukee, 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 Ozaukee in Wisconsin · Population: 92,345
Ozaukee, WI is tracked across three EPA datasets covering 20 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 54/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 5.7M 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 37 and a peak AQI of 161 in 2024, with 81% 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 | 296 (81%) | 61 | 7 | 161 |
| 2023 | 219 (60%) | 126 | 14 | 210 |
| 2022 | 228 (74%) | 74 | 4 | 159 |
| 2021 | 241 (66%) | 116 | 7 | 129 |
| 2020 | 269 (74%) | 91 | 4 | 164 |
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 |
|---|---|---|
| PORT WASHINGTON WATERWORKS | 12,853 | 0 |
| GRAFTON WATERWORKS | 12,269 | 0 |
| CEDARBURG L & W COMMISSION | 11,800 | 0 |
| MEQUON WATER UTILITY | 11,152 | 0 |
| SAUKVILLE WATERWORKS | 4,268 | 1 |
| BELGIUM WATERWORKS | 2,493 | 1 |
| FREDONIA WATERWORKS | 2,279 | 0 |
| CONCORDIA UNIVERSITY | 1,500 | 0 |
| MEQUON TRAIL TOWNHOMES | 615 | 1 |
| HUNTINGTON PARK | 600 | 0 |
| WESTCHESTER LAKES SUBDIVISION | 300 | 0 |
| PARK PLACE SUBDIVISION | 260 | 0 |
| BRIGHTON RIDGE SUBDIVISION | 200 | 0 |
| HADDONSTONE SUBDIVISION | 195 | 0 |
| COUNTRY TERRACE CONDO HOMES | 160 | 0 |
| CENTURY ESTATES 1 | 130 | 0 |
| VILLAGE HEIGHTS | 130 | 0 |
| VINTAGE ESTATES | 130 | 1 |
| KENILWORTH SUBD | 120 | 0 |
| MEQUON ON THE SQUARE CONDOMINIUM OWNERS ASSOCIATION INC | 110 | 0 |
| RAVINE FARMS HM OWNERS ASSOC | 100 | 0 |
| RIVER LAKE SUBDIVISION | 100 | 0 |
| WYNGATE SUBDIVISION | 100 | 0 |
| WOODRIDGE ESTATES | 100 | 0 |
| LINDEN LANE APTS 117 | 90 | 0 |
| HIGHLAND COLONY ESTATES CONDO | 88 | 0 |
| RIVER TRAILS ESTATES WATER USERS | 84 | 1 |
| LAKE COUNTRY APARTMENTS | 84 | 0 |
| WILLOW GLEN APARTMENTS | 80 | 4 |
| MEQUON COLONY ESTATES | 75 | 0 |
| ALBERTA SUBDIVISION | 75 | 0 |
| ELM GROVE TERRACE | 75 | 1 |
| MEQUON PARC APARTMENTS LLC | 60 | 0 |
| HICKORY SHADE | 55 | 1 |
| STONECROFT CONDOMINIUM ASSN | 50 | 1 |
| WATERS EDGE CONDOMINIUM ASSOCIATION | 50 | 0 |
| CEDAR JUNCTION | 45 | 0 |
| VILLAGE GLEN APTS | 30 | 0 |
| PW LAKE VIEW ESTATES LLC | 30 | 2 |
| MEQUON WATER TRUST | 26 | 1 |
TRI Facilities (20)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Charter Steel-Saukville | 5.4M lbs |
| 2 | Cedar Valley Cheese | 233.0K lbs |
| 3 | Kemps LLC | 22.9K lbs |
| 4 | Kickhaeffer Manufacturing Co LLC | 7.5K lbs |
| 5 | Curia Wisconsin Inc. | 4.8K lbs |
| 6 | Pace Industries Grafton Div | 523 lbs |
| 7 | Kleen Test Products Corp | 500 lbs |
| 8 | Veolia Es Technical Solutions LLC | 393 lbs |
| 9 | Tms International LLC | 107 lbs |
| 10 | Rehlko-Saukville | 100 lbs |
| 11 | Mid-City Foundry United Div | 87 lbs |
| 12 | Super Steel LLC | 74 lbs |
| 13 | Jbt Corp | 20 lbs |
| 14 | Johnson Brass & Machine Foundry Inc | 11 lbs |
| 15 | Rockwell Automation Inc | 3 lbs |
| 16 | Miba Industrial Bearings U.S. LLC | 0 lbs |
| 17 | Molded Dimensions | 0 lbs |
| 18 | Carlson Tool & Manufacturing Corp. | 0 lbs |
| 19 | Guy & O'Neill Inc | 0 lbs |
| 20 | Performance Health Supply Inc | 0 lbs |
Cities in Ozaukee (7)
Frequently Asked Questions
What is the environmental risk level in Ozaukee, Wisconsin? ▼
Are there Superfund sites in Ozaukee? ▼
How many toxic release facilities are in Ozaukee? ▼
What is the air quality in Ozaukee? ▼
Is the drinking water safe in Ozaukee? ▼
What environmental agencies cover Ozaukee? ▼
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.