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Sewage treatment plant, major discharger, Ottumwa, Iowa. NPDES permit IA0058611, in force until Feb 28, 2031. Last 12 months: over a limit once (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Solids, total suspended, 30-day average | 2709.927 | ≤ 2502 lb/d | 8% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | 30-day average | report only (SU) | all year | 001 |
| pH | daily maximum | report only (SU) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 2502 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 3753 lb/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 42.3 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 62.8 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.5 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 115.2 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 62.6 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.1 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 101.3 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 84.6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 94.7 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57.9 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45.1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69.7 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 84.4 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 83 mg/L | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 75.3 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 255.8 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 138.6 mg/L | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 92.2 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 162.9 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 235.6 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 180.2 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 111.8 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 141.5 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1625 lb/d | Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3174 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4690 lb/d | Dec | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1336 lb/d | Sep | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8610 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4693 lb/d | Feb | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2116 lb/d | Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7557 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6338 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7093 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4328 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3396 lb/d | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5404 lb/d | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6501 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6330 lb/d | Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5684 lb/d | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19224 lb/d | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10448 lb/d | Feb | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6857 lb/d | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12253 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17778 lb/d | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13607 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8533 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10714 lb/d | Jul | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 2085 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 3336 lb/d | all year | 001 |
| Report due [yrmoda] | daily maximum | ≤ 1 N=0;Y=1 | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 017 |
| pH | daily maximum | ≤ 9 SU | all year | 017 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 017 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 017 |
| Solids, total suspended | 30-day average | ≤ 2502 lb/d | all year | 017 |
| Solids, total suspended | 7-day average | ≤ 3753 lb/d | all year | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 55.2 mg/L | Nov | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 75.3 mg/L | Jan | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 158.8 mg/L | Mar | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23 mg/L | Sep | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 82.2 mg/L | Dec | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 191.3 mg/L | May | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27.9 mg/L | Oct | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 151.8 mg/L | Apr | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 70.4 mg/L | Jul | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 37 mg/L | Aug | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 83.8 mg/L | Feb | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 141.4 mg/L | Jun | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 107.5 mg/L | Nov | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 149.6 mg/L | Jan | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 225.9 mg/L | Mar | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 84.9 mg/L | Sep | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 104.1 mg/L | Dec | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 376.5 mg/L | May | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85.7 mg/L | Oct | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 258.7 mg/L | Apr | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 197 mg/L | Jul | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 108.2 mg/L | Aug | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 188.2 mg/L | Feb | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 350.4 mg/L | Jun | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4126 lb/d | Nov | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5612 lb/d | Jan | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11801 lb/d | Mar | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1745 lb/d | Sep | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6119 lb/d | Dec | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14227 lb/d | May | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2110 lb/d | Oct | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11315 lb/d | Apr | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5268 lb/d | Jul | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2777 lb/d | Aug | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6241 lb/d | Feb | 017 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10539 lb/d | Jun | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8213 lb/d | Nov | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11327 lb/d | Jan | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16903 lb/d | Mar | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6393 lb/d | Sep | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7892 lb/d | Dec | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 28143 lb/d | May | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6388 lb/d | Oct | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19405 lb/d | Apr | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14666 lb/d | Jul | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8038 lb/d | Aug | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14075 lb/d | Feb | 017 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26260 lb/d | Jun | 017 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 017 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year | 017 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | all year | 017 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 017 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 017 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 2085 lb/d | all year | 017 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 3336 lb/d | all year | 017 |
| Report due [yrmoda] | daily maximum | ≤ 1 N=0;Y=1 | all year | 017 |
Cited limits by parameter: Iowa's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IA0058611 · MCP: https://passage-data.com/mcp