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Sewage treatment plant, Stillman Valley, Illinois. NPDES permit IL0079197, in force until Oct 31, 2029. Last 12 months: no values over a limit, 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 6 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6.25 mg/L | Mar–Jul | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 73 lb/d | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 146 lb/d | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Apr–Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Apr–Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.1 lb/d | Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.1 lb/d | Apr–Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 lb/d | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18 lb/d | Apr–Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 29 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.8 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 23 lb/d | Mar | 003 |
| Phosphorus, total [as P] | 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 | ≤ .05 mg/L | all year | 003 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 61 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 122 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/IL0079197 · MCP: https://passage-data.com/mcp