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Sewage treatment plant, Crescent, Iowa. NPDES permit IA0076431 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 2 times (last June 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 26.5 | ≤ 25 mg/L | 6% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 26.4 | ≤ 25 mg/L | 6% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.3 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.9 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.8 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 46.5 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.1 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.5 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.4 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.1 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 101.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.3 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.1 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.2 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.9 lb/d | Mar |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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