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Sewage treatment plant, Ossian, Iowa. NPDES permit IA0042781 expired Sep 3, 2006; its limits still apply. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Flow, in conduit or thru treatment plant, daily maximum | .766 | ≤ .44 MGD | 74% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| 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 | ≤ 80 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 120 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 195 lb/d | all year |
| Solids, total suspended | 7-day average | ≤ 293 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 19 mg/L | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 29 mg/L | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 16 mg/L | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 17 mg/L | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 20 mg/L | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 34 mg/L | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 18 mg/L | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 51 mg/L | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40 mg/L | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45 mg/L | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 23 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 62 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 45 mg/L | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 63 mg/L | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 52 mg/L | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 44 mg/L | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 67 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 75 mg/L | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 37 mg/L | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 131 mg/L | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 91 mg/L | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 110 mg/L | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 68 mg/L | Apr |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 72 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 47 lb/d | Jul |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 73 lb/d | Oct |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 40 lb/d | Jun |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 43 lb/d | Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 51 lb/d | May |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 84 lb/d | Dec |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 45 lb/d | Aug |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 126 lb/d | Feb |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 97 lb/d | Mar |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 111 lb/d | Jan |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 57 lb/d | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 152 lb/d | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 110 lb/d | Jul |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 154 lb/d | Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 127 lb/d | Jun |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 107 lb/d | Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 164 lb/d | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 185 lb/d | Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 90 lb/d | Aug |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 321 lb/d | Feb |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 224 lb/d | Mar |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 269 lb/d | Jan |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 166 lb/d | Apr |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .293 MGD | all year |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .44 MGD | 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 | ≤ 61 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 98 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (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/IA0042781 · MCP: https://passage-data.com/mcp