Rock, WI
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Rock in Wisconsin · Population: 163,944
Rock, WI is tracked across three EPA datasets covering 26 Toxics Release Inventory (TRI) facilities, 17 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 53/100 (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 1.3M lbs of reported toxic releases under EPCRA Section 313, while 9 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 41 and a peak AQI of 112 in 2024, with 83% 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 | 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 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 (17)
| System | Population | Violations |
|---|---|---|
| JANESVILLE WATER UTILITY | 64,415 | 0 |
| BELOIT CITY OF | 36,677 | 8 |
| EVANSVILLE WATERWORKS | 5,703 | 12 |
| 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 | 1 |
| 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 |
Cities in Rock (7)
Frequently Asked Questions
What is the environmental risk level in Rock, Wisconsin? ▼
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How many toxic release facilities are in Rock? ▼
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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.