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Sewage treatment plant, Aplington, Iowa. NPDES permit IA0035050, in force until Jan 31, 2029. Last 12 months: no values over a limit, 18 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 2.5 mg/L | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | 30-day average | report only (SU) | all year |
| pH | daily maximum | report only (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 |
| Solids, total suspended | 30-day average | ≤ 233 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 350 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (lb/d) | all year |
| Solids, total suspended | daily maximum | report only (lb/d) | all year |
| Nitrogen, total [as N] | 30-day average | ≤ 54.2 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 88.6 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27.2 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 48.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.6 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.3 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 46.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.4 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.2 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.6 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 112 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42.4 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 79.8 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.4 lb/d | May |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 72 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 116 lb/d | all year |
Cited limits by parameter: Iowa'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/IA0035050 · MCP: https://passage-data.com/mcp