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Sewage treatment plant, Villisca, Iowa. NPDES permit IA0032549, in force until Mar 31, 2028. Last 12 months: over a limit once (last February 2026), 4 required values missing, 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 12.2 | ≤ 9.5 mg/L | 28% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.1 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 | ≤ 30 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 194 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 290 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 | ≤ 2.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.1 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.1 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 62.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 54.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 46.9 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 32.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.8 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 36.8 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 57 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 31.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55.5 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 33.6 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 123.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 55.7 lb/d | Oct |
| 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 | ≤ 161 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 258 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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