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Sewage treatment plant, Maribel, Wisconsin. NPDES permit WI0061051 expired Mar 31, 2022; its limits still apply. Last 12 months: over a limit 23 times (last March 2026), 54 required values missing, 18 of 25 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Copper, total recoverable, monthly average | 37 | ≤ 29 ug/L | 28% |
| October 2025 | Copper, total recoverable, weekly average | 37 | ≤ 29 ug/L | 28% |
| November 2025 | Copper, total recoverable, monthly average | 46 | ≤ 29 ug/L | 59% |
| November 2025 | Copper, total recoverable, weekly average | 46 | ≤ 29 ug/L | 59% |
| December 2025 | Copper, total recoverable, monthly average | 34 | ≤ 29 ug/L | 17% |
| December 2025 | Copper, total recoverable, weekly average | 34 | ≤ 29 ug/L | 17% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 18.1722 | ≤ 8.8 mg/L | 107% |
| December 2025 | Nitrogen, ammonia total [as N], weekly average | 37.05 | ≤ 8.8 mg/L | 321% |
| January 2026 | BOD, 5-day, 20 deg. C, weekly average | 36.25 | ≤ 30 mg/L | 21% |
| January 2026 | Copper, total recoverable, monthly average | 34 | ≤ 29 ug/L | 17% |
| January 2026 | Copper, total recoverable, weekly average | 34 | ≤ 29 ug/L | 17% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 25.1222 | ≤ 8.8 mg/L | 185% |
| January 2026 | Nitrogen, ammonia total [as N], weekly average | 37.45 | ≤ 8.8 mg/L | 326% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 31.95 | ≤ 20 mg/L | 60% |
| February 2026 | BOD, 5-day, 20 deg. C, weekly average | < 46.9 | ≤ 30 mg/L | 56% |
| February 2026 | Copper, total recoverable, monthly average | 39 | ≤ 29 ug/L | 34% |
| February 2026 | Copper, total recoverable, weekly average | 39 | ≤ 29 ug/L | 34% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 31.05 | ≤ 8.8 mg/L | 253% |
| February 2026 | Nitrogen, ammonia total [as N], weekly average | 38.2 | ≤ 8.8 mg/L | 334% |
| March 2026 | Copper, total recoverable, monthly average | 37 | ≤ 29 ug/L | 28% |
| March 2026 | Copper, total recoverable, weekly average | 37 | ≤ 29 ug/L | 28% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 10.0889 | ≤ 8.8 mg/L | 15% |
| March 2026 | Nitrogen, ammonia total [as N], weekly average | < 27.85 | ≤ 8.8 mg/L | 216% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 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 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 002 |
| Nitrogen, organic total [as N] | quarterly maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 8.8 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.8 mg/L | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | quarterly 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] | daily maximum | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 002 |
| Copper, total recoverable | weekly average | ≤ 29 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 29 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 48 ug/L | 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 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 701 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 701 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 701 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 701 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 701 |
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/WI0061051 · MCP: https://passage-data.com/mcp