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Sewage treatment plant, Casey, Illinois. NPDES permit IL0035084, in force until Jan 31, 2031. Last 12 months: over a limit once (last April 2026), 4 of 66 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| April 2026 | pH, maximum | 9.2 SU | ≤ 9 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 150 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 300 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.6 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 19 lb/d | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 14 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 44 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 98 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38 lb/d | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 38 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 86 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.8 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 50 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 35 lb/d | Jun–Aug | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | May–Oct | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 125 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 250 lb/d | 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 | ≤ 12 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 14 lb/d | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 29 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.5 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.8 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 lb/d | Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 lb/d | Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 lb/d | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.6 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.4 lb/d | Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 lb/d | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.8 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.2 mg/L | Mar | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.4 lb/d | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 5 lb/d | Mar | 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 | monthly average | ≤ .75 mg/L | all year | 003 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 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 | ≤ 12 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 24 lb/d | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | 004 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 004 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | A01 |
| pH | minimum | ≥ 6 SU | all year | A01 |
| pH | maximum | ≤ 9 SU | all year | A01 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | A01 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | A01 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | A01 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | A01 |
| 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/IL0035084 · MCP: https://passage-data.com/mcp