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Sewage treatment plant, Harpers Ferry, Iowa. NPDES permit IA0070564, in force until Jul 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 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 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 | ≤ 18 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 26 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 | ≤ 18 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.8 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.7 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.7 lb/d | Feb |
| 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 | ≤ 15 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 23 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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