Rock County, WI
The federal environmental record for Rock County (population 164,278): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
5
federal cleanup sites
1
PFAS-detecting water systems
23
TRI facilities
10
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Janesville Ash Beds | Janesville | on the NPL | 09/21/1984 |
| Janesville Old Landfill | Janesville | on the NPL | 09/21/1984 |
| Wheeler Pit | La Prairie Township | deleted | 09/21/1984 |
Drinking water: PFAS testing
Public water systems serving Rock with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| BELOIT CITY OF WI1540112 | PFBS: 3 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
23 facilities in Rock filed TRI reports for 2024, totalling 230k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CHARTER NEXT GENERATION - MILTON | MILTON | Ozone | 169k lb |
| UNITED ETHANOL LLC | MILTON | Formic acid, Acetaldehyde | 20k lb |
| TWIN STATE INC | JANESVILLE | Ammonia | 8k lb |
| GENENCOR INTERNATIONAL WISCONSIN INC. | BELOIT | Ammonia | 8k lb |
| EVONIK CORP | MILTON | Chloromethane, Ammonia | 7k lb |
| SCHREIBER FOODS | BELOIT | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 6k lb |
| FRITO-LAY INC | BELOIT | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 4k lb |
| BAKER MANUFACTURING CO | EVANSVILLE | Copper, Manganese | 4k lb |
| EVONIK INDUSTRIES | JANESVILLE | Chloromethane, Dimethyl sulfate | 2k lb |
| D & K COATING TECHNOLOGIES INC | JANESVILLE | Toluene | 894 lb |
| RATHGIBSON JANESVILLE LLC | JANESVILLE | Chromium, Nickel | 511 lb |
| SCOT FORGE CO | CLINTON | Copper, Manganese | 41 lb |
| STAINLESS TANK & EQUIPMENT CO LLC | BELOIT | Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region), Nickel And Nickel Compounds | 15 lb |
| ABITEC CORP JANESVILLE PLANT | JANESVILLE | Ethylene oxide | 0 lb |
| STOUGHTON TRAILERS LLC-PLANT 7 | EVANSVILLE | - | 0 lb |
| BLUESCOPE BUILDINGS NA | EVANSVILLE | - | 0 lb |
| CARGILL FEED & NUTRITION MILTON | MILTON | - | 0 lb |
| UFP JANESVILLE LLC | JANESVILLE | - | 0 lb |
| PENN COLOR INC. | MILTON | - | 0 lb |
| MORGAN TRUCK BODY LLC | JANESVILLE | - | 0 lb |
| DSB TECHNOLOGIES LLC | JANESVILLE | - | 0 lb |
| OZINGA READY-MIX CONCRETE BELOIT | BELOIT | Lead | 0 lb |
| PRECISION DRAWN METALS INC | JANESVILLE | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 679 tank facilities in Rock: 313 tanks in service and 1,565 closed. 341 fuel releases are on record, of which 10 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Rock as Zone 1, the highest predicted indoor radon levels (over 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Rock, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- EDGERTON SAND & GRAVELEDGERTON
- JANESVILLE ASH BEDSJANESVILLE
- JANESVILLE OLD LANDFILLJANESVILLE
- RIVERSIDE PLATING CO INCJANESVILLE
- WHEELER PITJANESVILLE