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Sewage treatment plant, major discharger, Orange City, Iowa. NPDES permit IA0032751 expired Jan 26, 2009; its limits still apply. Last 12 months: over a limit 3 times (last May 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 26.6 | ≤ 17.2 mg/L | 55% |
| April 2026 | Nitrogen, ammonia total [as N], daily maximum | 23.7 | ≤ 21.8 mg/L | 9% |
| May 2026 | Nitrogen, ammonia total [as N], daily maximum | 25.1 | ≤ 20.1 mg/L | 25% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | ≤ 1268 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 1902 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 | ≤ 17.3 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.9 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.6 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.9 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.3 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 17.2 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 235 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 188 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 219 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 210 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 211 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 246 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 175 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 299 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 203 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 280 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 273 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 252 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 302 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 217 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 269 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 210 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 211 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 246 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 175 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 300 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 240 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 343 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 318 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 339 lb/d | Feb |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 17.3 mg/L | Jan |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 18.7 mg/L | Feb |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 15.9 mg/L | Mar |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 18.5 mg/L | Apr |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 17.9 mg/L | May |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 15.5 mg/L | Jun |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 13.3 mg/L | Jul |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 18.9 mg/L | Oct |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 13.4 mg/L | Nov |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 14.6 mg/L | Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 19.3 mg/L | Jan |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 21.8 mg/L | Feb |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 17.2 mg/L | Mar |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 21.8 mg/L | Apr |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 20.1 mg/L | May |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 13.8 mg/L | Nov |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 15.4 mg/L | Dec |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 235 lb/d | Jan |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 252 lb/d | Feb |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 219 lb/d | Mar |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 280 lb/d | Apr |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 273 lb/d | May |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 246 lb/d | Jun |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 211 lb/d | Jul |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 175 lb/d | Aug |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 210 lb/d | Sep |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 299 lb/d | Oct |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 188 lb/d | Nov |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | ≤ 203 lb/d | Dec |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 302 lb/d | Jan |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 339 lb/d | Feb |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 269 lb/d | Mar |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 343 lb/d | Apr |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 318 lb/d | May |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 246 lb/d | Jun |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 211 lb/d | Jul |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 175 lb/d | Aug |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 210 lb/d | Sep |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 300 lb/d | Oct |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 217 lb/d | Nov |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 240 lb/d | Dec |
| 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 |
| Toxicity [acute], Ceriodaphnia dubia | 30-day average | ≤ 1 N=0;Y=1 | all year |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 30-day average | ≤ 1 N=0;Y=1 | all year |
| 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 | ≤ 396 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 634 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
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