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Sewage treatment plant, Blue Grass, Iowa. NPDES permit IA0028975 expired Aug 31, 2020; its limits still apply. 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 303 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 454 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 | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 41 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 131 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 547 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 51 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 52 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 41 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 131 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 547 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15.5 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 11 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 51 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.9 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.3 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.2 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 96 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 76 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 156 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 497 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2072 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 59 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 42 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 193 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 72 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 198 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 50 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 96 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 76 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 156 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 497 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2072 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 42 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 193 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 72 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 198 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 50 lb/d | Sep |
| 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 |
| 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 | ≤ 95 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 151 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/IA0028975 · MCP: https://passage-data.com/mcp