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Sewage treatment plant, Ely, Iowa. NPDES permit IA0047988, in force until Feb 29, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 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 | ≤ 125.1 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 187.7 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 | ≤ 3.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.4 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.5 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.2 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.7 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.9 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.2 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.8 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.9 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.7 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.4 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 66.6 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 61.2 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 58.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 65.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40.9 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59.2 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 61.2 lb/d | Mar |
| 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 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year |
| Chloride [as Cl] | 30-day average | report only (lb/d) | all year |
| Chloride [as Cl] | daily maximum | report only (lb/d) | all year |
| E. coli | geometric mean | ≤ 598 #/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 | ≤ 104.3 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 166.8 lb/d | all year |
Cited limits by parameter: Iowa's rules and the federal ones.
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