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Sewage treatment plant, Central City, Iowa. NPDES permit IA0027979, in force until Feb 28, 2027. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, carbonaceous [5 day, 20 C], 30-day average | 27.5 | ≤ 25 mg/L | 10% |
| January 2026 | pH, daily maximum | 10.55 | ≤ 9 SU | — |
| July 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 46 | ≤ 40 mg/L | 15% |
| July 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 62.02346 | ≤ 54 lb/d | 15% |
| 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 | ≤ 40 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 60 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 | ≤ 43 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32.2 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.7 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.7 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 35.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 32.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 39.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 36.1 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31.9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 34 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36.1 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.9 lb/d | Sep |
| 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 | ≤ 34 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 54 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/IA0027979 · MCP: https://passage-data.com/mcp