TRI Facilities
991
EPCRA Section 313 reporters
2023 EPA TRI data 991 facilities 977 water systems
Wisconsin Environmental Profile
According to the U.S. Environmental Protection Agency's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List, this is Wisconsin's (WI) full public environmental-compliance record - toxic releases, drinking-water systems, and Superfund sites in one place.
WI regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
Clean Water Act, NPDES (water-system health violations)
432 records
- RCRA · Subtitle C 46
RCRA Subtitle C (Superfund-site proxy)
46 records
What this shows Counts are mapped to statute as a structural proxy and reflect reported activity, not toxicity-weighted or population-adjusted risk. Clean Air Act (Title V) permit data is not currently ingested by this portal, so air-permit compliance is not shown here.
Water Systems
977
SDWIS regulated
Superfund Sites
46
36 active NPL
Total Releases
147.9M lbs
TRI cumulative disclosure
Compliance Snapshot - WI
Sites with no recorded health violations 78.0%
Sites with at least one open violation 22.0%
Wisconsin consolidates three federal EPA datasets into one statewide environmental profile: 991 Toxics Release Inventory (TRI) facilities reporting under EPCRA Section 313, 977 community water systems regulated under the Safe Drinking Water Act, and 46 sites on the Superfund National Priorities List.
TRI facilities in WI have cumulatively disclosed 147.9M lbs of toxic chemical releases, while SDWIS records show 2,233 total violations across the state's regulated water systems, of which 432 systems carry an active health-based violation (MCL exceedance or treatment-technique failure). Activity clusters in counties such as Milwaukee, Waukesha, Dane, which account for the highest combined facility, water-system, and Superfund presence.
Every figure reflects the public regulatory record as filed with the U.S. Environmental Protection Agency and is not weighted for toxicity, geographic footprint, or population exposure. A state can rank high in any individual metric because of industrial history, naturally occurring contaminants in source water, or simply the number of reporting facilities, not because current residents face unsafe conditions. Drill into any county or water system below for the full disclosure record.
What does this state's environmental record show?
TRI Facilities
991
Water Systems
977
Superfund Sites
46
Total Violations
2,233
Total Releases
147.9M lbs
Health Violations
432
water systems
Largest Polluters
View all →| # | Facility | Total Releases |
|---|---|---|
| 1 | Mullins Cheese Inc | 11.2M lbs |
| 2 | Foremost Farms USA | 9.8M lbs |
| 3 | Waupaca Foundry Plant 2/3 | 6.8M lbs |
| 4 | Columbia Energy Center | 6.4M lbs |
| 5 | McCain Foods USA Inc | 5.8M lbs |
| 6 | Charter Steel-Saukville | 5.4M lbs |
| 7 | Weston Power Plant | 5.4M lbs |
| 8 | Waupaca Foundry Plant 1 | 5.2M lbs |
| 9 | Neenah Foundry Co Neenah Operations | 4.1M lbs |
| 10 | Ahlstrom Na Specialty Solutions LLC | 3.5M lbs |
| 11 | Packaging Corp of Ameri Ca | 3.3M lbs |
| 12 | Manitowoc Public Utilities | 3.0M lbs |
| 13 | Water Quality Center | 2.7M lbs |
| 14 | Wpc Technologies | 2.4M lbs |
| 15 | Wisconsin Rapids Pulp Mill | 2.3M lbs |
| 16 | Ppg Industries Inc-Oak Creek | 2.2M lbs |
| 17 | Kohler Co | 2.0M lbs |
| 18 | Dairyland Power Cooperative - Alma Site | 2.0M lbs |
| 19 | Oak Creek Site | 2.0M lbs |
| 20 | Mullins Cheese Inc | 1.9M lbs |
Water Quality
Systems with Health Violations
| Water System | Population | Violations |
|---|---|---|
| WAUKESHA WATER UTILITY | 70,718 | 779 |
| SUSSEX VILLAGE HALL & WATER UTILITY | 11,750 | 106 |
| DELLS CLUB CONDO ASSOC 3 | 75 | 87 |
| PEWAUKEE VILLAGE WATERWORKS | 8,166 | 59 |
| PEWAUKEE CITY WATER AND SEWER UTILITY | 8,671 | 53 |
| WINNECONNE WATERWORKS | 2,502 | 32 |
| ASHLAND WATER UTILITY | 8,000 | 31 |
| ELKHORN WATERWORKS | 10,317 | 26 |
| JEFFERSON WATERWORKS | 7,926 | 23 |
| LA VALLE WATERWORKS | 365 | 18 |
| TOMAH WATERWORKS | 9,192 | 17 |
| DODGE SANITARY DIST 1 | 120 | 16 |
| RANDOLPH WATER DEPT | 1,800 | 15 |
| BUTTERNUT WATERWORKS | 283 | 14 |
| MANITOU FALLS SANITARY DISTRICT NO 1 | 95 | 14 |
| WAUPUN CORRECTIONAL INST | 3,706 | 12 |
| MARSHVIEW TERRACE | 40 | 12 |
| EVANSVILLE WATERWORKS | 5,703 | 12 |
| JUNEAU WATERWORKS | 2,627 | 10 |
| TREMAIN MOBILE HOME PARK | 475 | 10 |
Cities with Water Issues
Adell
Pop: -
Belgium
Pop: -
Chilton
Pop: -
Clyman
Pop: -
Elkhart Lake
Pop: -
Germantown
Pop: -
Grafton
Pop: -
Horicon
Pop: -
Jackson
Pop: -
Johnson Creek
Pop: -
Juneau
Pop: -
Kiel
Pop: -
Brookfield
Pop: -
Lomira
Pop: -
Mayville
Pop: -
Menomonee Falls
Pop: -
Ixonia
Pop: -
Oconomowoc
Pop: -
Pewaukee
Pop: -
Plymouth
Pop: -
Superfund Sites (46)
Counties (75 total)
| County | Facilities |
|---|---|
| Milwaukee | 129 |
| Waukesha | 74 |
| Dane | 44 |
| Brown | 57 |
| Ozaukee | 20 |
| Marathon | 37 |
| Outagamie | 34 |
| Walworth | 22 |
| Dodge | 27 |
| Racine | 29 |
| Rock | 26 |
| Sheboygan | 27 |
| Washington | 33 |
| Sauk | 17 |
| Winnebago | 34 |
| Manitowoc | 26 |
| Columbia | 15 |
| Grant | 13 |
| Kenosha | 21 |
| Portage | 14 |
Showing top 20 counties by environmental activity. Wisconsin has 75 counties total.
Largest Cities
Adell
Pop: -
1 facilities · 1 water systems
Allenton
Pop: -
2 facilities · 1 water systems
Belgium
Pop: -
1 facilities · 1 water systems
Brownsville
Pop: -
1 facilities · 0 water systems
Cedarburg
Pop: -
3 facilities · 1 water systems
Cedar Grove
Pop: -
1 facilities · 1 water systems
Chilton
Pop: -
4 facilities · 1 water systems
Clyman
Pop: -
1 facilities · 1 water systems
Eden
Pop: -
1 facilities · 0 water systems
Elkhart Lake
Pop: -
1 facilities · 1 water systems
Germantown
Pop: -
13 facilities · 1 water systems
Grafton
Pop: -
4 facilities · 5 water systems
Hartford
Pop: -
8 facilities · 1 water systems
Glendale
Pop: -
2 facilities · 1 water systems
Horicon
Pop: -
2 facilities · 1 water systems
Jackson
Pop: -
2 facilities · 1 water systems
Johnson Creek
Pop: -
3 facilities · 1 water systems
Juneau
Pop: -
1 facilities · 2 water systems
Kiel
Pop: -
4 facilities · 1 water systems
Kohler
Pop: -
1 facilities · 1 water systems
Frequently Asked Questions
How many polluting facilities are in Wisconsin? ▼
Wisconsin has 991 facilities that report to the EPA Toxic Release Inventory (TRI). These facilities have collectively reported 147.9M lbs in total toxic chemical releases. TRI data is self-reported annually by facilities that manufacture, process, or use listed toxic chemicals above threshold amounts.
Does Wisconsin have Superfund sites? ▼
Yes, Wisconsin has 46 sites on the EPA Superfund National Priorities List (NPL). Superfund sites are contaminated locations identified for long-term cleanup under the EPA Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
Is the water safe in Wisconsin? ▼
Wisconsin has 977 EPA-regulated water systems. 432 water systems have reported health-based violations (MCL exceedances). A past violation does not necessarily mean water is currently unsafe. For current water quality, contact your local water utility. Source: EPA SDWIS.
What environmental data is available for Wisconsin? ▼
PlainEnviro provides three categories of EPA environmental data for Wisconsin: Toxic Release Inventory (TRI) data covering 991 industrial facilities, Safe Drinking Water Information System (SDWIS) data for 977 water systems, and Superfund National Priorities List (NPL) data for 46 contaminated sites.
How does Wisconsin compare to other states environmentally? ▼
Wisconsin has 991 TRI facilities with 147.9M lbs in total releases, 46 Superfund sites, and 2,233 water system violations on record. State-level environmental comparisons depend on many factors including industrial activity, population, and geographic size. Source: EPA TRI, SDWIS, and Superfund NPL databases.
Explore More Data for Wisconsin
TRI Facilities in Wisconsin →
Every toxic-release facility reporting in the state, ranked by volume
Drinking Water Systems in Wisconsin →
Community water systems and their violation records
Air Quality in Wisconsin →
County-level AQI from EPA monitoring stations
Compare states by burden →
EJ screening scores for every U.S. county
State environmental rankings →
How states compare on releases, water and Superfund
Browse all states →
Environmental profiles for every U.S. state
About This Data
This page aggregates environmental data from three EPA programs for Wisconsin: the Toxic Release Inventory (TRI) for industrial chemical releases, the Safe Drinking Water Information System (SDWIS) for water quality, and the Superfund National Priorities List (NPL) for hazardous waste cleanup sites.
PlainEnviro presents this data without advocacy framing. Numbers reflect reported data and may not capture all environmental activity. For specific health or environmental concerns, contact your state environmental agency.
What to do with Wisconsin's data
Use this state profile as a starting point, then drill into the specific dataset that matters to you.
- Check the 991 TRI facilities reporting in Wisconsin for the largest reported releases near a specific county. View facilities
- 432 water systems in the state have a recorded health-based violation, check if yours is one of them. Check water systems
- See how Wisconsin compares to other states on releases, water violations, and Superfund sites. State rankings
Reported data reflects what facilities and agencies disclose to the EPA; it is not a complete measure of environmental risk or a substitute for local guidance.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro Editorial
According to the U.S. Environmental Protection Agency, this state profile is drawn from PlainEnviro's database of more than 25,000 EPA-tracked facilities, the Safe Drinking Water Information System, and the Superfund National Priorities List, compiled since federal reporting began under the Emergency Planning and Community Right-to-Know Act in October 1986; see our methodology for full source citations and refresh cadence.
Every figure on PlainEnviro is rendered directly from EPA environmental compliance data, no number is typed in by an editor. State environmental figures are computed directly from EPA data. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.