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Sewage treatment plant, Middletown, Iowa. NPDES permit IA0025381 expired Oct 31, 2026. Last 12 months: over a limit once (last September 2026), 8 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| September 2026 | BOD, carbonaceous [5 day, 20 C], 7-day average | 45 | ≤ 40 mg/L | 13% |
| 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 | ≥ 6.5 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 | ≤ 245 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 367 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 | ≤ 7.4 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.36 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16.8 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.72 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.3 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.61 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.54 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.5 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.8 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.8 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.8 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 33 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 44 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 24 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 22 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 37 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 54 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 61 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 lb/d | Dec |
| 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 | ≤ 77 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 122 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/IA0025381 · MCP: https://passage-data.com/mcp