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Sewage treatment plant, Arlington, Wisconsin. NPDES permit WI0021512 expired Sep 30, 2020; its limits still apply. Last 12 months: over a limit 8 times (last February 2026), 36 required values missing, 18 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride [as Cl], weekly average | 635 | ≤ 613 mg/L | 4% |
| November 2025 | Chloride [as Cl], weekly average | 702.5 | ≤ 613 mg/L | 15% |
| December 2025 | BOD, 5-day, 20 deg. C, weekly average | 31 | ≤ 30 mg/L | 3% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 28 | ≤ 26 mg/L | 8% |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 24.125 | ≤ 20 mg/L | 21% |
| January 2026 | BOD, 5-day, 20 deg. C, weekly average | 43 | ≤ 30 mg/L | 43% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 44 | ≤ 26 mg/L | 69% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 54 | ≤ 26 mg/L | 108% |
| 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] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | all year | 001 |
| Chloride [as Cl] | weekly average | ≤ 613 mg/L | all year | 001 |
| Chloride [as Cl] | monthly average | report only (lb/d) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (lb/d) | 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/WI0021512 · MCP: https://passage-data.com/mcp