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Sewage treatment plant, Brillion, Wisconsin. NPDES permit WI0020443 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit once (last October 2025), 34 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Phosphorus, total [as P], monthly average | 1.1354 | ≤ 1 mg/L | 14% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5.7 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5.8 mg/L | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 18 mg/L | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 8 mg/L | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.2 mg/L | Apr, May | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Chloride [as Cl] | weekly average | ≤ 1100 mg/g | all year | 001 |
| 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/WI0020443 · MCP: https://passage-data.com/mcp