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Sewage treatment plant, Center Point, Iowa. NPDES permit IA0074420, in force until Nov 30, 2028. Last 12 months: no values over a limit. 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 | ≤ 202 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 304 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 | ≤ 103 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 168.6 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.4 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.4 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.3 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29.2 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25.2 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.3 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 109.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 97.4 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 101 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 101 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 114.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 109.3 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 101.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 115.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 108.4 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 123.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 105.5 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 | ≤ 169 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 270 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/IA0074420 · MCP: https://passage-data.com/mcp