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Sewage treatment plant, Melrose, Wisconsin. NPDES permit WI0024678 expired Mar 31, 2024; its limits still apply. Last 12 months: over a limit 9 times (last June 2026), 43 required values missing, 7 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Solids, total suspended, monthly average | 32.8 | ≤ 30 mg/L | 9% |
| May 2026 | BOD, 5-day, 20 deg. C, monthly average | 45 | ≤ 30 mg/L | 50% |
| May 2026 | BOD, 5-day, 20 deg. C, weekly average | 91.5 | ≤ 45 mg/L | 103% |
| May 2026 | pH, daily minimum | 4.9 | ≥ 6 SU | — |
| June 2026 | BOD, 5-day, 20 deg. C, monthly average | 42.1 | ≤ 30 mg/L | 40% |
| June 2026 | BOD, 5-day, 20 deg. C, weekly average | 80 | ≤ 45 mg/L | 78% |
| June 2026 | Solids, total suspended, monthly average | 48.8 | ≤ 30 mg/L | 63% |
| June 2026 | Solids, total suspended, weekly average | 64.5 | ≤ 45 mg/L | 43% |
| June 2026 | pH, daily minimum | 4.5 | ≥ 6 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 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 | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 12 mg/L | all year | 002 |
| Phosphorus, total [as P] | annual average | report only (lb/yr) | all year | 002 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (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 | 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 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 702 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 702 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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