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Sewage treatment plant, Colesburg, Iowa. NPDES permit IA0023604, in force until Jul 31, 2030. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 1 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 60 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 90 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, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.9 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.3 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.4 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11.9 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.5 lb/d | Nov |
| E. coli | geometric mean | ≤ 128 #/100mL | all year |
| 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 | ≤ 50 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 80 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/IA0023604 · MCP: https://passage-data.com/mcp