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Sewage treatment plant, Pocahontas, Iowa. NPDES permit IA0035173, in force until Jul 31, 2031. 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 | ≤ 230 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 345 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 | ≤ 1 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.6 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.3 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.5 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 3.4 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.7 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 4 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.3 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.4 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.7 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.2 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.7 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.6 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.5 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.2 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.3 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17.8 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.1 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.9 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 10 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 26.1 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.3 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11.7 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 7.7 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 8.1 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 30.3 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 39.3 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91.2 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 112.7 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 64.5 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 51.7 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 122.5 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 116.5 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 71.3 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 100.5 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40.5 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47.5 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 108.9 lb/d | Feb |
| Nitrogen, nitrate total [as N] | 30-day average | ≤ 175 lb/d | all year |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 286.12 lb/d | all year |
| 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 | ≤ 630 #/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 | ≤ 192 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 307 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/IA0035173 · MCP: https://passage-data.com/mcp