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Sewage treatment plant, Fairwater, Wisconsin. NPDES permit WI0021440 expired Jun 30, 2022; its limits still apply. Last 12 months: no values over a limit, 53 required values missing, 6 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Jun–Aug | 004 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 23 mg/L | Jun–Aug | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | Jun–Aug | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 19 lb/d | Jun–Aug | 004 |
| pH | daily minimum | ≥ 6 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | weekly average | ≤ 23 mg/L | Jun–Aug | 004 |
| Solids, total suspended | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 004 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jun–Aug | 004 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 24 mg/L | Jul–Sep | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 29 mg/L | Oct | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 28 mg/L | Nov | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 31 mg/L | Dec | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 31 mg/L | Jan, Feb | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 28 mg/L | Mar | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 19 mg/L | Apr | 004 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 28 mg/L | May, Jun | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.6 mg/L | Jul–Sep | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 mg/L | Oct | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 mg/L | Nov | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 mg/L | Dec | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 25 mg/L | Jan, Feb | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | Mar | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | Apr | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | May, Jun | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Jul–Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Oct | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Nov | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 mg/L | Jan, Feb | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Mar | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Apr | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | May, Jun | 004 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Chloride [as Cl] | weekly average | ≤ 680 mg/L | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 704 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 704 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 704 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 704 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 704 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 704 |
Cited limits by parameter: Wisconsin's rules and the federal ones.
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