Rock, 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 Rock in Wisconsin · Population: 163,944
TRI sites such as Charter Next Generation - Milton; Stoughton Trailers Llc-Plant 7; United Ethanol LLC; SDWIS systems such as MILTON WATERWORKS; EDGERTON WATERWORKS; BRODHEAD WATERWORKS; NPL sites such as Janesville Ash Beds; Janesville Old Landfill; Wheeler Pit anchor Rock, WI's EPA extract. Derived burden score 68/100 (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 Rock include MILTON WATERWORKS; EDGERTON WATERWORKS; FOOTVILLE WATERWORKS, while Charter Next Generation - Milton leads reported TRI pounds among local Form R filers. AQS median AQI 41 / peak 112 in 2024.
Burden score 68/100 (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 Rock -- 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 Rock, WI: EPA TRI 2023 reporting year
Same facilities, both years
-11.7%
24 facilities that filed in 2022 and 2023
Whole inventory
-11.7%
271.8 thousand lb → 240.1 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Rock, WI's total reported releases fell from 271.8 thousand lb in 2022 to 240.1 thousand lb in 2023, based on EPA TRI filings.
- Rock, WI's off-site transfers fell from 37.9 thousand lb in 2022 to 25.0 thousand lb in 2023, based on EPA TRI filings.
- Rock, WI's chemicals reported fell from 44 in 2022 to 39 in 2023, based on EPA TRI filings.
- Rock, WI's air releases fell from 233.9 thousand lb in 2022 to 215.1 thousand 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 | 171 (83%) | 32 | 2 | 112 |
| 2023 | 131 (64%) | 52 | 20 | 177 |
| 2022 | 184 (91%) | 18 | 0 | 97 |
| 2021 | 173 (84%) | 32 | 0 | 100 |
| 2020 | 192 (91%) | 15 | 3 | 105 |
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 (14)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MILTON WATERWORKS | 5,588 | 1 |
| EDGERTON WATERWORKS | 5,512 | 2 |
| BRODHEAD WATERWORKS | 3,216 | 0 |
| CLINTON WATERWORKS | 2,119 | 0 |
| ORFORDVILLE WATERWORKS | 1,475 | 0 |
| FOOTVILLE WATERWORKS | 816 | 2 |
| ROCK RIVER LEISURE ESTATES COOP | 650 | 0 |
| CARAVILLA EDUCATION AND REHAB CENTER | 298 | 1 |
| FULTON UTILITY DISTRICT | 200 | 1 |
| OAKHILL WATERWORKS | 130 | 0 |
| MOUNTAIN VIEW MHP 1 | 50 | 0 |
| BIRCHWOOD TRAILER COURT | 32 | 1 |
| MOUNTAIN VIEW MHP 2 | 25 | 0 |
| PRAIRIE LAKE ESTATES MHP | 25 | 1 |
TRI Facilities (26)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Charter Next Generation - Milton | 844.1K lbs |
| 2 | Stoughton Trailers Llc-Plant 7 | 71.1K lbs |
| 3 | United Ethanol LLC | 67.5K lbs |
| 4 | D & K Coating Technologies Inc | 56.5K lbs |
| 5 | Evonik Corp | 47.2K lbs |
| 6 | Twin State Inc | 46.1K lbs |
| 7 | Genencor International Wisconsin Inc. | 44.8K lbs |
| 8 | Baker Manufacturing Co | 43.1K lbs |
| 9 | Rathgibson Janesville LLC | 30.7K lbs |
| 10 | Frito-Lay Inc | 23.3K lbs |
| 11 | Hormel Foods Corp | 17.1K lbs |
| 12 | Evonik Industries | 13.2K lbs |
| 13 | Bluescope Buildings Na | 8.5K lbs |
| 14 | I-K-I Manufacturing Co I Nc | 1.6K lbs |
| 15 | Northstar Medical Radioisotopes LLC | 854 lbs |
| 16 | Scot Forge Co | 203 lbs |
| 17 | Stainless Tank & Equipment Co LLC | 75 lbs |
| 18 | Dsb Technologies LLC | 30 lbs |
| 19 | Morgan Truck Body LLC | 16 lbs |
| 20 | Fairbanks Morse Defense | 7 lbs |
| 21 | Abitec Corp Janesville Plant | 1 lbs |
| 22 | Ozinga Ready-Mix Concrete Beloit | 0 lbs |
| 23 | Ufp Janesville LLC | 0 lbs |
| 24 | Precision Drawn Metals Inc | 0 lbs |
| 25 | Cargill Feed & Nutrition Milton | 0 lbs |
| 26 | Penn Color Inc. | 0 lbs |
Superfund Sites (3)
| Site Name | Status | HRS Score |
|---|---|---|
| Janesville Ash Beds | NPL Site | 57.90 |
| Janesville Old Landfill | NPL Site | 57.93 |
| Wheeler Pit | Deleted NPL Site | 57.80 |
Cities in Rock (9)
Frequently Asked Questions
What is the environmental risk level in Rock, Wisconsin? ▼
Are there Superfund sites in Rock? ▼
How many toxic release facilities are in Rock? ▼
What is the air quality in Rock? ▼
Is the drinking water safe in Rock? ▼
What environmental agencies cover Rock? ▼
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.