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Sewage treatment plant, major discharger, Wapello, Iowa. NPDES permit IA0047961, in force until Apr 30, 2028. Last 12 months: over a limit 2 times (last September 2026), 5 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | E. coli, geometric mean | 172.7175 | ≤ 126 #/100mL | 37% |
| September 2026 | E. coli, geometric mean | 359.399 | ≤ 126 #/100mL | 185% |
| 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 | ≤ 80 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 707 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 1061 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, 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 | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia 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 |
| 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 |
| Chlorine, total residual | 30-day average | ≤ 1.38 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 1.38 mg/L | all year | 001 |
| Chlorine, total residual | 30-day average | ≤ 2.21 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 2.21 lb/d | all year | 001 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 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 | ≤ 221 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 354 lb/d | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 1 mg/L | all year | 004 |
| pH | daily minimum | ≥ 6 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 80 mg/L | all year | 004 |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 707 lb/d | all year | 004 |
| Solids, total suspended | 7-day average | ≤ 1061 lb/d | all year | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Nov | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Oct | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Aug | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Feb | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | May | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 51.5 mg/L | Jan | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Jul | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 mg/L | Dec | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.1 mg/L | Mar | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.2 mg/L | Apr | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Jun | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.9 mg/L | Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Nov | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Oct | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Aug | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Feb | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | May | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 51.5 mg/L | Jan | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jul | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Mar | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.2 mg/L | Apr | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.3 mg/L | Jun | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Sep | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60.7 lb/d | Nov | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60.7 lb/d | Oct | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60.7 lb/d | Aug | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 192.6 lb/d | Feb | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 73 lb/d | May | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 455.7 lb/d | Jan | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 73 lb/d | Jul | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 88.9 lb/d | Dec | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 88.9 lb/d | Mar | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 108 lb/d | Apr | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 73 lb/d | Jun | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60.7 lb/d | Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60.7 lb/d | Nov | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60.7 lb/d | Oct | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60.7 lb/d | Aug | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 192.6 lb/d | Feb | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 73 lb/d | May | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 455.7 lb/d | Jan | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 73 lb/d | Jul | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 88.9 lb/d | Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 88.9 lb/d | Mar | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 108 lb/d | Apr | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 73 lb/d | Jun | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 60.7 lb/d | Sep | 004 |
| Chlorine, total residual | 30-day average | ≤ .053 mg/L | all year | 004 |
| Chlorine, total residual | daily maximum | ≤ .053 mg/L | all year | 004 |
| Chlorine, total residual | 30-day average | ≤ .465 lb/d | all year | 004 |
| Chlorine, total residual | daily maximum | ≤ .465 lb/d | all year | 004 |
| E. coli | geometric mean | ≤ 126 #/100mL | Mar–Nov | 004 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 N=0;Y=1 | all year | 004 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | ≤ 1 N=0;Y=1 | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 221 lb/d | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 354 lb/d | all year | 004 |
Cited limits by parameter: Iowa's rules and the federal ones.
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