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Sewage treatment plant, major discharger, Delavan, Wisconsin. NPDES permit WI0031461 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit, 24 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Nitrogen, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | quarterly maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | quarterly maximum | report only (mg/L) | all year | 001 |
| Nickel, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Chromium, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | monthly maximum | report only (ng/L) | all year | 001 |
| Mercury, total recoverable | monthly maximum | report only (ng/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 701 |
| BOD, 5-day, 20 deg. C | monthly maximum | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 701 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | 701 |
| Nickel, total recoverable | monthly maximum | report only (ug/L) | all year | 701 |
| Zinc, total recoverable | monthly maximum | report only (ug/L) | all year | 701 |
| Cadmium, total recoverable | monthly maximum | report only (ug/L) | all year | 701 |
| Lead, total recoverable | monthly maximum | report only (ug/L) | all year | 701 |
| Chromium, total recoverable | monthly maximum | report only (ug/L) | all year | 701 |
| Copper, total recoverable | monthly maximum | report only (ug/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 | monthly maximum | report only (MGD) | all year | 701 |
| Mercury, total recoverable | monthly maximum | report only (ng/L) | 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/WI0031461 · MCP: https://passage-data.com/mcp