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Sewage treatment plant, Conrad, Iowa. NPDES permit IA0034355, in force until Jan 31, 2027. Last 12 months: over a limit once (last December 2025), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, carbonaceous [5 day, 20 C], 7-day average | 47.2 | ≤ 40 mg/L | 18% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 4.4 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 | ≥ 6.3 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 | ≤ 65 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 97 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, total [as N] | 30-day average | ≤ 54.2 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 88.6 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.6 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.9 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.5 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 19.2 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.7 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.9 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9.3 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 14.7 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.6 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 6.5 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.7 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.8 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43.7 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 43.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42.2 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41.2 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40.9 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41.1 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.2 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41.5 lb/d | Oct |
| E. coli | geometric mean | ≤ 126 #/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 | ≤ 54 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 87 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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