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Sewage treatment plant, Prophetstown, Illinois. NPDES permit IL0043061, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Overflows | monthly total | report only (#/mo) | all year | 001 |
| Overflows | monthly total | report only (#/mo) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 37 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 201 lb/d | all year | 003 |
| Solids, total suspended | weekly average | ≤ 244 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ .6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 003 |
| Chlorine, total residual | daily maximum | ≤ .6 mg/L | May–Oct | 003 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 136 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 217 lb/d | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
Cited limits by parameter: Illinois'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/IL0043061 · MCP: https://passage-data.com/mcp