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Sewage treatment plant, Rock Rapids, Iowa. NPDES permit IA0032786 expired Jun 30, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 2.7 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 | ≥ 6.4 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 | ≤ 126 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 188 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 | ≤ 10 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.3 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.2 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.8 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.4 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.5 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45.8 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.2 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27.1 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 39.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.2 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.2 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 68.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77.1 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 64.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 66.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 68.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 64.3 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 71.2 lb/d | Aug |
| Chloride [as Cl] | 30-day average | ≤ 681 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 681 mg/L | all year |
| Chloride [as Cl] | 30-day average | ≤ 2488 lb/d | all year |
| Chloride [as Cl] | daily maximum | ≤ 2761 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 | ≤ 105 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 167 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/IA0032786 · MCP: https://passage-data.com/mcp