Waukesha, WI
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Waukesha in Wisconsin · Population: 409,040
TRI sites such as Metaltek International-Wisco Nsin Centrifugal Div; Veolia Es Technical Solutions LLC; The Gund Co; SDWIS systems such as MENOMONEE FALLS WW - SURFACE WATER; HARTLAND WATERWORKS; PEWAUKEE CITY WATER AND SEWER UTILITY; NPL sites such as Lauer I Sanitary Landfill; Master Disposal Service Landfill; Muskego Sanitary Landfill anchor Waukesha, WI's EPA extract. Derived burden score 90/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Waukesha include MENOMONEE FALLS WW - SURFACE WATER; PEWAUKEE CITY WATER AND SEWER UTILITY; PEWAUKEE VILLAGE WATERWORKS, while Metaltek International-Wisco Nsin Centrifugal Div leads reported TRI pounds among local Form R filers. AQS median AQI 43 / peak 101 in 2024.
Burden score 90/100 (High Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Waukesha -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Waukesha, WI: EPA TRI 2023 reporting year
Same facilities, both years
+14.1%
52 facilities that filed in 2022 and 2023
Whole inventory
+13.2%
368.4 thousand lb → 417.1 thousand lb, every facility that filed
Between the two reporting years, 3 facilities filed for the first time and 6 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Waukesha, WI's total reported releases rose from 363.4 thousand lb in 2022 to 414.9 thousand lb in 2023, based on EPA TRI filings.
- Waukesha, WI's land releases fell from 160 lb in 2022 to 17 lb in 2023, based on EPA TRI filings.
- Waukesha, WI's off-site transfers rose from 184.9 thousand lb in 2022 to 246.5 thousand lb in 2023, based on EPA TRI filings.
- Waukesha, WI's water releases fell from 112 lb in 2022 to 89 lb in 2023, based on EPA TRI filings.
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 | 260 (71%) | 105 | 1 | 101 |
| 2023 | 171 (48%) | 167 | 19 | 270 |
| 2022 | 215 (59%) | 144 | 4 | 126 |
| 2021 | 177 (48%) | 184 | 4 | 108 |
| 2020 | 214 (60%) | 143 | 2 | 129 |
Source: 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 (55)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MENOMONEE FALLS WW - SURFACE WATER | 23,867 | 1 |
| HARTLAND WATERWORKS | 9,212 | 0 |
| PEWAUKEE CITY WATER AND SEWER UTILITY | 8,671 | 55 |
| PEWAUKEE VILLAGE WATERWORKS | 8,166 | 61 |
| TOWN OF BROOKFIELD SAN DIST 4 | 6,419 | 0 |
| DOUSMAN WATER UTILITY | 2,350 | 2 |
| BUTLER WATERWORKS | 2,181 | 0 |
| PRAIRIE VILLAGE WATER TRUST | 2,100 | 1 |
| EAGLE WATERWORKS | 1,950 | 3 |
| LAKE MEADOWS WATER TRUST | 750 | 0 |
| HALE PARK MEADOWS | 720 | 0 |
| DURHAM MEADOWS WATER TRUST | 700 | 0 |
| DELAFIELD SQUARE | 587 | 0 |
| SPACIOUS ACRES MOBILE HOME COMMUNITY | 525 | 0 |
| LAKE DRIVE WATER TRUST | 500 | 1 |
| BRANDYBROOK SUBDIVISION | 474 | 1 |
| PARQUELYNN VILLAGE | 450 | 0 |
| SQUIRES GROVE | 410 | 0 |
| MARIAN HEIGHTS SUBDIVISION | 400 | 4 |
| NASHOTAH HOUSE | 350 | 0 |
| ST JOHNS NORTHWESTERN ACADEMIES | 340 | 3 |
| TAN OAK APTS | 325 | 1 |
| SUNNYFIELD ACRES | 300 | 0 |
| DELAFIELD WATERWORKS | 300 | 0 |
| ARBORS | 280 | 2 |
| GENESEE LAKE SCHOOL SOUTH | 230 | 0 |
| MARLAN MEADOWS HOMEOWNERS ASSOC | 210 | 0 |
| PINES SUBDIVISION | 200 | 2 |
| LAD LAKE | 180 | 0 |
| NORRIS INC | 141 | 2 |
| PIONEER CENTRE | 140 | 0 |
| GENESEE LAKE SCHOOL NORTH | 110 | 0 |
| HEAVEN CITY | 106 | 0 |
| LINCOLNSHIRE PLACE | 100 | 0 |
| STONEY CREEK ADULT COMMUNITY | 95 | 0 |
| COUNTRY AIRE APARTMENTS 2 | 90 | 0 |
| SCHOENSTATT SISTERS OF MARY | 80 | 1 |
| COUNTRY AIRE APARTMENTS 3 | 80 | 0 |
| DOUGLAS PLAZA SOUTH | 62 | 0 |
| HILLS OF WALES APTS | 50 | 2 |
| CARRIAGE HILLS CONDOMINIUMS | 50 | 3 |
| CAMBRIDGE PLACE OF DELAFIELD | 50 | 2 |
| COUNTRY COURT SUBDIVISION | 45 | 0 |
| EVERGREENS | 40 | 1 |
| COUNTRY AIRE CONDOS 4821 | 40 | 0 |
| COUNTRY AIRE CONDOS 4835 | 40 | 0 |
| COUNTRY AIRE CONDOS 4887 | 40 | 0 |
| COUNTRY AIRE CONDOS 4875 | 40 | 0 |
| PRESTON PINES | 38 | 0 |
| MUSKEGO LAKE AIRE APARTMENTS | 35 | 0 |
| DOUGLAS PLAZA NORTH | 30 | 0 |
| QUAIL HOLLOW CONDOS | 30 | 0 |
| SANCTUARY OF DELAFIELD | 27 | 3 |
| WELLS ST STATION 425 WEST | 25 | 0 |
| WELLS ST STATION 435 EAST | 25 | 0 |
TRI Facilities (50)
Superfund Sites (4)
| Site Name | Status | HRS Score |
|---|---|---|
| Lauer I Sanitary Landfill | NPL Site | 42.69 |
| Master Disposal Service Landfill | NPL Site | 47.49 |
| Muskego Sanitary Landfill | NPL Site | 51.91 |
| Waste Management of Wisconsin, Inc. (Brookfield Sanitary Landfill) | NPL Site | 28.90 |
Cities in Waukesha (21)
Frequently Asked Questions
What is the environmental risk level in Waukesha, Wisconsin? ▼
Are there Superfund sites in Waukesha? ▼
How many toxic release facilities are in Waukesha? ▼
What is the air quality in Waukesha? ▼
Is the drinking water safe in Waukesha? ▼
What environmental agencies cover Waukesha? ▼
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.