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Sewage treatment plant, Nora Springs, Iowa. NPDES permit IA0032778, in force until Jan 31, 2031. Last 12 months: no values over a limit, 1 of 11 reports late. 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 | ≤ 150 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 225 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 | ≤ 78.7 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 128.8 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 24 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.9 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.1 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 79.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24.4 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 54.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 82.9 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40.2 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91.1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 87.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 86.7 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 88.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 98.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 81.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 81.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 82.9 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 87.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85.4 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 | ≤ 125 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 200 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/IA0032778 · MCP: https://passage-data.com/mcp