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Sewage treatment plant, Corning, Iowa. NPDES permit IA0027375, in force until Jul 31, 2027. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | pH, daily maximum | 10.8 | ≤ 9 SU | — |
| May 2026 | Solids, total suspended, 7-day average | 62 | ≤ 45 mg/L | 38% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4.2 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 136 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 204 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 | ≤ 8.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.8 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.8 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.3 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.4 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 37.1 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 70 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72.2 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45.3 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56.6 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 73.4 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 69.9 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65.7 lb/d | Feb |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year |
| E. coli | geometric mean | ≤ 630 #/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 | ≤ 113 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 181 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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