Is Lake Mohawksin Polluted?
Yes — Lake Mohawksin in Lincoln County, Wisconsin is on the EPA's Clean Water Act 303(d) impaired-waters list (2024 assessment cycle). It is cited for Oxygen depletion (low DO), PFAS. No cleanup plan (TMDL) has been completed yet. "Impaired" is a legal designation, separate from the lake's EPA condition class water-quality readings: it means at least one designated use (such as swimming, aquatic life, or fish consumption) does not meet state standards for the listed pollutant.
EPA 303(d) Listing
| On 303(d) impaired list | Yes |
| Cleanup plan (TMDL) | Not yet written |
| Assessment cycle | 2024 |
| EPA IR category | 5 |
| Uses not supported | Aquatic life, Fish consumption |
| EPA names this lake in the listing | Yes |
| Location | Lincoln County, Wisconsin |
Pollutants Cited
- Oxygen depletion (low DO) — listed by EPA as exceeding water-quality standards for at least one designated use.
- PFAS — Per- and polyfluoroalkyl "forever chemicals" from industrial and firefighting-foam sources. PFAS listings are newer and typically trigger fish-consumption and, in some cases, drinking-water guidance.
Specific parameters in the EPA record: Biochemical Oxygen Demand (BOD), Perfluorooctane Sulfonate (PFOS).
What this means for using Lake Mohawksin
Lake Mohawksin's listing is driven by contaminants that build up in fish (PFAS), so the practical impact is on eating the fish, not on swimming. Follow the state fish-consumption advisory for Wisconsin. An impairment listing does not mean the lake is closed — most impaired lakes remain open for boating and swimming. It means a specific pollutant exceeds a standard for a specific use. Lake Mohawksin measures phosphorus at 34.7 µg/L. See the full breakdown on the lake report. The official EPA assessment is available in the ATTAINS waterbody report.
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