Walworth County, WI
The federal environmental record for Walworth County (population 105,822): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
1
Superfund NPL sites
5
federal cleanup sites
2
PFAS-detecting water systems
21
TRI facilities
9
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Delavan Municipal Well #4 | Delavan | on the NPL | 09/21/1984 |
Drinking water: PFAS testing
Public water systems serving Walworth 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 |
|---|---|---|
| LAKE GENEVA UTILITY COMMISSION WI2650066 | PFBS: 6 ng/L PFOA: 4.7 ng/L PFHxS: 3.9 ng/L | above final limit |
| EAST TROY WATERWORKS WI2650123 | PFBS: 4.8 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
21 facilities in Walworth filed TRI reports for 2024, totalling 32k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| PLYMOUTH TUBE TRENT PLANT | EAST TROY | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Nitric acid | 20k lb |
| BRUNK INDUSTRIES INC. | LAKE GENEVA | Nickel, Chromium | 7k lb |
| HUDAPACK METAL TREATING INC | ELKHORN | Methanol | 3k lb |
| CONAGRA FOODS PACKAGED FOODS LLC | DARIEN | Nitric acid | 750 lb |
| STELLANA US | LAKE GENEVA | 4,4'-Methylenebis(2-chloroaniline), Nickel | 745 lb |
| HEXPOL - WHITEWATER | WHITEWATER | Zinc compounds | 679 lb |
| USG INTERIORS LLC | WALWORTH | Hydrogen sulfide, Carbonyl sulfide | 229 lb |
| USG STRUCTURAL TECHNOLOGIES LLC | DELAVAN | Lead And Lead Compounds | 134 lb |
| WISCONSIN PRECISION CASTING CORP | LAKE GENEVA | Chromium, Nickel | 72 lb |
| ARNTZEN CORP | SHARON | Manganese, Copper | 65 lb |
| R&L SPRING CO | LAKE GENEVA | Chromium, Nickel | 47 lb |
| WISCONSIN PRECISION CASTING CORP | EAST TROY | Chromium, Nickel | 23 lb |
| PRECISION PLUS INC. | ELKHORN | Chromium, Copper | 22 lb |
| APPLIED MATERIAL SOLUTIONS INC | ELKHORN | Formaldehyde | 10 lb |
| COPERION PROCESS SOLUTIONS LLC | WHITEWATER | Chromium | 4 lb |
| SPX FLOW US LLC | DELAVAN | Chromium, Nickel | 3 lb |
| SPX FLOW US LLC | DELAVAN | Chromium, Nickel | 1 lb |
| INTERTRACTOR AMERICA CORP | ELKHORN | - | 0 lb |
| PENTAIR FLOW TECHNOLOGIES | DELAVAN | - | 0 lb |
| ISELI PRECISION LLC | WALWORTH | - | 0 lb |
| EXACTO LLC | SHARON | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 594 tank facilities in Walworth: 200 tanks in service and 1,253 closed. 317 fuel releases are on record, of which 9 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Walworth 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 Walworth, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ALPHA CAST IIWHITEWATER
- CRUCIBLE INC TRENT TUBE DIV PLT 1EAST TROY
- DELAVAN MUNICIPAL WELL #4DELAVAN
- ELKHORN METAL FINISHERS INCELKHORN
- GETZEN CO INC THEELKHORN