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Sewage treatment plant, Riverside, Iowa. NPDES permit IA0047945, in force until Jun 30, 2031. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| May 2026 | pH, daily minimum | 5.73 | ≥ 6 SU |
| 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 | ≤ 163 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 245 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 | ≤ 11 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 12.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10.3 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.6 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 5.2 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.2 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.6 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.7 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.5 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 60.2 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 69 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 27.8 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 44 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41.6 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 28.2 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.6 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.7 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19.4 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 43.8 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 75.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.3 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 85.6 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63.4 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.3 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 53.1 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.3 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37.2 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 53.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44.6 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 53.1 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 |
| 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 | ≤ 136 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 218 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
Your permit document is the final word. As JSON: /api/v1/permits/IA0047945 · MCP: https://passage-data.com/mcp