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Sewage treatment plant, Stanley, Iowa. NPDES permit IA0054178, in force until Apr 30, 2031. Last 12 months: over a limit once (last May 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 4.15 | ≤ 3.7 mg/L | 12% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6.4 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 | ≤ 4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33.6 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.6 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.2 lb/d | May |
| Chloride [as Cl] | 30-day average | ≤ 485 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 643 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 809 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 1073 lb/d | all year |
| E. coli | geometric mean | ≤ 178 #/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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