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Sewage treatment plant, Mondamin, Iowa. NPDES permit IA0023507 expired Jun 30, 2007; its limits still apply. Last 12 months: over a limit 3 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 27.65 | ≤ 25 mg/L | 11% |
| February 2026 | pH, daily maximum | 9.05 | ≤ 9 SU | — |
| August 2026 | Solids, total suspended, 30-day average | 94.7 | ≤ 80 mg/L | 18% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | 30-day average | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 511 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 767 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 | ≤ 8.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 35 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 51 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 218 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 66 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 175 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 107 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 81 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 222 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 56 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 86 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 326 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 99 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 263 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 161 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 121 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 333 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 84 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 128 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 70 lb/d | Aug |
| 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 | ≤ 160 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 256 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (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/IA0023507 · MCP: https://passage-data.com/mcp