TRI Facilities
991
Very high
WI · EPA TRI · SDWIS · Superfund
Wisconsin environmental disclosure record
According to EPA's 2023 Toxics Release Inventory, Safe Drinking Water Information System, and Superfund National Priorities List extracts, this is Wisconsin's full public registry profile, toxic releases, drinking-water systems, and Superfund sites in one place.
- TRI facilities
- 991
- Reported releases
- 147.9M lbs
- #30 of 56
- Water systems
- 978
- Superfund NPL sites
- 46
Wisconsin vs. every U.S. state
Cumulative TRI-reported release pounds, with this state marked in the national distribution
148M lbs 46th percentile higher than 46% of 56 states with TRI reporters
Each bar is a $1M-wide band; taller bars hold more states with TRI reporters. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
WI regulatory profile by statute
Violation/site counts mapped to the EPA statutes this portal tracks
- CWA · NPDES
- RCRA · Subtitle C 46
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.
How Wisconsin compares across two EPA disclosure measures
The highlighted point is Wisconsin. The vertical axis is the share of tracked water systems with at least one health-based SDWIS record; the horizontal axis is TRI-reported pounds per facility on a logarithmic scale so the full state distribution stays readable. The crosshairs use the portal’s published national benchmark medians.
This matrix compares disclosure rates, not toxicity, exposure, current compliance, or drinking-water safety. A lower position on either axis is not a safety rating; use the underlying facility and water-system records for context.
According to EPA TRI, SDWIS, and Superfund NPL extracts, Wisconsin (WI) lists 991 TRI-reporting facilities disclosing 147.9M lbs of toxic releases. The same extracts list 46 Superfund sites and 978 EPA-regulated water systems, of which 422 carry health-based SDWIS violation rows. PlainEnviro's composite environmental health score for Wisconsin is 55/100 (grade F), benchmarked against all U.S. states on chemical release intensity, drinking-water health violations, Superfund site burden, and water violation rate. This is a percentile-derived composite from federal disclosure counts, not a clinical health-risk assessment.
F 55
Wisconsin Environmental Health Score
A percentile-benchmarked 0–100 composite from 4 EPA federal datasets, with weight redistribution for any unavailable dimension
Chemical Release Intensity C 75
149K (lbs per facility) Drinking Water Health Violations F 46
43.1% (% of systems) Superfund Site Burden F 29
4.6 (sites per 100 facilities) Water Violation Rate D 66
2.4 (violations per system) Benchmarks derived from EPA TRI, SDWIS, and Superfund NPL extracts across all 56 U.S. states and territories
Water Systems
978
Moderate
Superfund Sites
46
High
Total Releases
147.9M lbs
Very high
Compliance Snapshot - WI
Sites with no recorded health violations 78.6%
Sites with at least one open violation 21.4%
Wisconsin's profile joins three independently maintained EPA programs into one statewide record: the Toxics Release Inventory (TRI, EPCRA Section 313 industrial disclosures), the Safe Drinking Water Information System (SDWIS, Safe Drinking Water Act compliance), and the Superfund National Priorities List. Each program uses its own reporting cadence and facility-identification scheme; PlainEnviro joins them by matched facility and system location rather than a shared federal ID, so a site absent from one program is never assumed absent from another. The counts below reflect the portal's rebuild as of August 2026.
Activity clusters in counties such as Milwaukee, Waukesha, Dane, which account for the highest combined facility, water-system, and Superfund presence. Monitoring and reporting violations are not included in the SDWIS counts shown here.
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
978
Superfund Sites
46
Health-Based Violation Records
2,317
Total Releases
147.9M lbs
cumulative, all reported years
Systems with Records
422
water systems
Release-over-release change
What changed for Wisconsin: EPA TRI 2023 reporting year
Same facilities, both years
+8.7%
816 facilities that filed in 2022 and 2023
Whole inventory
+0.2%
26.4 million lb → 26.4 million lb, every facility that filed
Between the two reporting years, 32 facilities filed for the first time and 45 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Wisconsin's chemicals reported rose from 150 in 2022 to 163 in 2023, based on EPA TRI filings.
- Wisconsin's air releases fell from 6.6 million lb in 2022 to 6.3 million lb in 2023, based on EPA TRI filings.
- Wisconsin's land releases rose from 5.8 million lb in 2022 to 6.0 million lb in 2023, based on EPA TRI filings.
- Wisconsin's water releases fell from 2.5 million lb in 2022 to 2.5 million lb in 2023, based on EPA TRI filings.
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 | 61 |
| PEWAUKEE CITY WATER AND SEWER UTILITY | 8,671 | 55 |
| WINNECONNE WATERWORKS | 2,502 | 32 |
| ASHLAND WATER UTILITY | 8,000 | 31 |
| ELKHORN WATERWORKS | 10,317 | 26 |
| JEFFERSON WATERWORKS | 7,926 | 23 |
| RANDOLPH WATER DEPT | 1,800 | 20 |
| WAUPUN CORRECTIONAL INST | 3,706 | 18 |
| LA VALLE WATERWORKS | 365 | 18 |
| TOMAH WATERWORKS | 9,192 | 17 |
| DODGE SANITARY DIST 1 | 120 | 16 |
| BUTTERNUT WATERWORKS | 283 | 14 |
| MARSHVIEW TERRACE | 40 | 13 |
| MANITOU FALLS SANITARY DISTRICT NO 1 | 95 | 13 |
| EVANSVILLE WATERWORKS | 5,703 | 12 |
| PEPIN WATERWORKS | 816 | 12 |
| JUNEAU WATERWORKS | 2,627 | 10 |
Cities with Water Issues
Mequon
25 water systems
Milwaukee
20 water systems
Stevens Point
18 water systems
Madison
16 water systems
Pewaukee
9 water systems
Colfax
9 water systems
Delafield
9 water systems
Kenosha
7 water systems
Pardeeville
7 water systems
Black River Falls
7 water systems
Green Bay
6 water systems
Waukesha
6 water systems
La Crosse
6 water systems
Marshfield
6 water systems
Hayward
6 water systems
Oconomowoc
6 water systems
Burlington
5 water systems
Grafton
5 water systems
Crandon
5 water systems
Oak Creek
4 water systems
Superfund Sites (46)
Counties (72 total)
| County | Facilities |
|---|---|
| Milwaukee | 129 |
| Waukesha | 74 |
| Dane | 44 |
| Brown | 57 |
| Ozaukee | 20 |
| Outagamie | 34 |
| Marathon | 37 |
| Sheboygan | 27 |
| Washington | 33 |
| Walworth | 22 |
| Racine | 29 |
| Rock | 26 |
| Manitowoc | 26 |
| Winnebago | 34 |
| Dodge | 27 |
| Sauk | 17 |
| Grant | 13 |
| Kenosha | 21 |
| Columbia | 15 |
| Portage | 14 |
Showing top 20 counties by environmental activity. Wisconsin has 72 counties total.
Cities with Environmental Records
Milwaukee
84 facilities · 20 water systems
Green Bay
36 facilities · 6 water systems
Waukesha
25 facilities · 6 water systems
Menomonee Falls
22 facilities · 1 water systems
Appleton
21 facilities · 3 water systems
Oshkosh
20 facilities · 4 water systems
Manitowoc
20 facilities · 3 water systems
Oak Creek
15 facilities · 4 water systems
Sheboygan
15 facilities · 3 water systems
De Pere
13 facilities · 4 water systems
Eau Claire
13 facilities · 3 water systems
Germantown
13 facilities · 1 water systems
Madison
12 facilities · 16 water systems
Racine
12 facilities · 3 water systems
La Crosse
11 facilities · 6 water systems
Wausau
10 facilities · 4 water systems
Fond Du Lac
10 facilities · 3 water systems
Schofield
10 facilities · 1 water systems
Franklin
9 facilities · 2 water systems
Janesville
9 facilities · 1 water systems
Frequently Asked Questions
How many TRI 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).
What does EPA SDWIS list for drinking water in Wisconsin? ▼
Wisconsin has 978 EPA-regulated water systems in the Safe Drinking Water Information System (SDWIS) extract used here. 422 water systems have a health-based violation row (MCL exceedance) in this historical extract. A past registry row is not a current drinkability verdict. For current utility conditions, contact the local water utility or the Wisconsin drinking water program. 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 978 water systems, and Superfund National Priorities List (NPL) data for 46 contaminated sites.
How does Wisconsin compare to other states on EPA disclosure counts? ▼
Wisconsin has 991 TRI facilities with 147.9M lbs in total releases, 46 Superfund sites, and 2,317 water system violations on record. These are federal disclosure counts; they are not toxicity-weighted or population-adjusted risk scores. Source: EPA TRI, SDWIS, and Superfund NPL databases.
What is Wisconsin's environmental health score? ▼
PlainEnviro's composite environmental health score for Wisconsin is 55/100 (grade F). This score combines four percentile-benchmarked dimensions from EPA federal extracts: chemical release intensity per TRI facility, drinking-water health violation rate from SDWIS, Superfund site burden relative to industrial activity, and overall water violation rate. Scores are benchmarked against all 56 U.S. states and territories. When a dimension lacks data, its weight redistributes to the remaining dimensions so the score never deflates from missing inputs. This is a registry-count composite, not a clinical exposure or health-outcome assessment.
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
- 422 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.
Use and verify this record
Wisconsin's profile brings together EPA release, drinking-water, and Superfund records. It reports the underlying programs without making a health or environmental-risk determination.
State environmental figures are computed directly from EPA data. The methodology records the joins, definitions, and refresh cadence for each program.
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.