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Sewage treatment plant, Columbus Junction, Iowa. NPDES permit IA0023523, in force until Oct 31, 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 476 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 714 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 | ≤ 83.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 55 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 55 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 86.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 46.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 65.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 54.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 54.9 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 86.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 54.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 54.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 206 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 126.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 126.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 104.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 266.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 110.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 151.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 104.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 123.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 115.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 104.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 126.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 206 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 266.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 110.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 151.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 123.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 115.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 126.3 lb/d | May |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year |
| 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 | ≤ 149 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 238 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IA0023523 · MCP: https://passage-data.com/mcp