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Sewage treatment plant, major discharger, Fond Du Lac County, Wisconsin. NPDES permit WI0023990 expired Mar 31, 2023; its limits still apply. Last 12 months: no values over a limit, 64 required values missing, 2 of 31 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 003 |
| pH | daily minimum | ≥ 6 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 17 mg/L | Jun–Sep | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 33 mg/L | Oct, Nov | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 34 mg/L | Jan–Mar | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 34 mg/L | Apr, May | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 34 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 34 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.1 mg/L | Jun–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 19 mg/L | Apr, May | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13 mg/L | Oct, Nov | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 mg/L | Jan–Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jun–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Apr, May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Oct, Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan–Mar | 003 |
| Phosphorus, total [as P] | monthly average | ≤ .8 mg/L | all year | 003 |
| Phosphorus, total [as P] | annual average | report only (lb/yr) | all year | 003 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 003 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 003 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Mercury, total recoverable | quarterly maximum | report only (ng/L) | all year | 003 |
| Coliform, fecal general | weekly geometric mean | ≤ 656 #/100mL | May–Sep | 003 |
| Coliform, fecal general | geometric mean | ≤ 400 #/100mL | May–Sep | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 703 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 703 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 703 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 703 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 703 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 703 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 703 |
| Mercury, total recoverable | quarterly maximum | report only (ng/L) | all year | 703 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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