Marathon County, WI
The federal environmental record for Marathon County (population 138,612): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
4
Superfund NPL sites
9
federal cleanup sites
4
PFAS-detecting water systems
35
TRI facilities
18
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| Mid-State Disposal, Inc. Landfill | Cleveland Township | on the NPL | 09/21/1984 |
| Spickler Landfill | Spencer | on the NPL | 07/22/1987 |
| Unity Auto Mart | Unity | on the NPL | 03/16/2022 |
| Wausau Ground Water Contamination | Wausau | on the NPL | 06/10/1986 |
Drinking water: PFAS testing
Public water systems serving Marathon 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 |
|---|---|---|
| SCHOFIELD WATERWORKS WI7370162 | PFBS: 11 ng/L PFPeA: 9.8 ng/L PFHxA: 7.8 ng/L | above final limit |
| WESTON MUNICIPAL UTILITIES WI7370163 | PFBS: 22 ng/L PFOS: 13 ng/L PFOA: 5.9 ng/L | above final limit |
| RIB MOUNTAIN SANITARY DIST WI7370660 | PFPeA: 23 ng/L PFBA: 16 ng/L PFOS: 9.4 ng/L | above final limit |
| WAUSAU WATERWORKS WI7370102 | PFBA: 5 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
35 facilities in Marathon filed TRI reports for 2024, totalling 3.3M lb released. The 25 largest by volume:
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| MULLINS CHEESE INC | MOSINEE | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 1.6M lb |
| WESTON POWER PLANT | MOSINEE | Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Manganese compounds | 658k lb |
| MULLINS CHEESE INC | MARSHFIELD | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 430k lb |
| AHLSTROM MOSINEE LLC | MOSINEE | Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 321k lb |
| 3M CO - WAUSAU DOWNTOWN | WAUSAU | Zinc compounds, Copper And Copper Compounds | 83k lb |
| 3M CO - WAUSAU - GREYSTONE | WAUSAU | Zinc compounds, Lead And Lead Compounds | 69k lb |
| CRYSTAL FINISHING SYSTEMS INC | SCHOFIELD | Dimethyl phthalate, Chromium compounds (except for chromite ore mined in the Transvaal Region) | 54k lb |
| DOMTAR PAPER CO LLC | ROTHSCHILD | Methanol, Manganese compounds | 49k lb |
| CRYSTAL FINISHING SYSTEMS INC - MOSINEE | MOSINEE | Nitrate compounds (water dissociable; reportable only when in aqueous solution), Chromium compounds (except for chromite ore mined in the Transvaal Region) | 46k lb |
| MERRILL IRON & STEEL INC. | SCHOFIELD | Aluminum oxide (fibrous forms), Manganese | 21k lb |
| LINETEC PAINT/PLASTICS | WAUSAU | Xylene (mixed isomers), Toluene | 11k lb |
| GPI CORP | SCHOFIELD | Styrene | 4k lb |
| BORREGAARD USA INC. | ROTHSCHILD | Formaldehyde, Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 4k lb |
| VERITAS STEEL | WAUSAU | Nickel, Copper | 1k lb |
| WAUSAU CHEMICAL CORP | WAUSAU | Ammonia, Nitric acid | 825 lb |
| IMPERIAL INDUSTRIES INC | ROTHSCHILD | Chromium compounds (except for chromite ore mined in the Transvaal Region), Nickel | 723 lb |
| NORLEN INC. | SCHOFIELD | Manganese, Chromium | 593 lb |
| JARP INDUSTRIES INC | SCHOFIELD | Manganese, Chromium | 314 lb |
| KERRY INC. ROTHSCHILD | ROTHSCHILD | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 218 lb |
| LAND O LAKES-SPENCER DAIRY | SPENCER | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 125 lb |
| GREENHECK FAN CORP - FACILITY 2 & 8 | SCHOFIELD | Manganese, Chromium | 87 lb |
| EPIROC DRILLING TOOLS LLC | KRONENWETTER | Manganese | 65 lb |
| MARATHON ELECTRIC LLC | WAUSAU | Copper, Manganese | 59 lb |
| MELRON CORP. | SCHOFIELD | Copper | 56 lb |
| RAMROD INDUSTRIES LLC | SPENCER | Manganese, Chromium | 38 lb |
Underground fuel tanks
EPA's UST Finder records 997 tank facilities in Marathon: 328 tanks in service and 2,140 closed. 458 fuel releases are on record, of which 18 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Marathon 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 Marathon, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ABBOTSFORD PCE INVESTIGATIONABBOTSFORD
- MID-STATE DISPOSAL, INC. LANDFILLCLEVELAND TOWNSHIP
- MURRAY MACHINERY INCORPORATEDWAUSAU
- RIB MOUNTAIN MUNICIPAL WELLRIB MOUNTAIN
- SPENCER DRUM - STREBE PROPERTYSPENCER
- SPICKLER LANDFILLSPENCER
- UNDEVELOPED ROSEMURGY PROPERTYWAUSAU
- UNITY AUTO MARTUNITY
- WAUSAU GROUND WATER CONTAMINATIONWAUSAU