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Sewage treatment plant, Salem, Iowa. NPDES permit IA0047996, in force until Jan 31, 2030. Last 12 months: over a limit 3 times (last October 2025), 10 required values missing, 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], 30-day average | 14.3 | ≤ 1.8 mg/L | 694% |
| October 2025 | Nitrogen, ammonia total [as N], daily maximum | 16.3 | ≤ 2.8 mg/L | 482% |
| October 2025 | pH, daily maximum | 10.87 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 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 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.5 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.1 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.5 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.4 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.6 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.9 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 9 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.8 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.8 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.3 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 21 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 31.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26.7 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.7 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.3 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27.9 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 156.3 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 23.1 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 27.4 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 30.8 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 66.6 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 |
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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