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Sewage treatment plant, Gilbertville, Iowa. NPDES permit IA0028177, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 50 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 75 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 | ≤ 39.3 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 64.4 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 77.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 104.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 93.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 78 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 89.5 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 102.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 76.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 78.2 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 91.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 88.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 79.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 120.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 93.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 78 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 89.5 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 102.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 76.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 78.2 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 88.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 79.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 120.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 89.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 115.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 106.9 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 90 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 100.8 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 113.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 87.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 90.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 103.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 99.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 92 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 130.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 89.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 115.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 106.9 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 90 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100.8 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 113.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 87.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 90.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 103.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 99.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 92 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 130.7 lb/d | Feb |
| 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 | ≤ 41.7 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 66.7 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/IA0028177 · MCP: https://passage-data.com/mcp