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Sewage treatment plant, major discharger, Marshfield, Wisconsin. NPDES permit WI0021024 expired Sep 30, 2023; its limits still apply. Last 12 months: no values over a limit, 95 required values missing, 12 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 4 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ 4.8 ng/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ 4.8 ng/L | all year | 002 |
| BOD, carbonaceous [5 day, 5 C] | weekly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 5 C] | monthly average | ≤ 16 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 5 C] | daily maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 702 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 702 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 702 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 702 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | all year | 702 |
| Mercury, total recoverable | quarterly maximum | report only (ng/L) | all year | 702 |
| BOD, carbonaceous [5 day, 5 C] | monthly average | report only (mg/L) | all year | 702 |
| BOD, carbonaceous [5 day, 5 C] | daily maximum | report only (mg/L) | all year | 702 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WI0021024 · MCP: https://passage-data.com/mcp