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Sewage treatment plant, Colchester, Illinois. NPDES permit IL0028177, in force until Jan 31, 2031. Last 12 months: over a limit 3 times (last June 2026), 8 required values missing, 2 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 2.637 mg/L | ≤ 2.5 mg/L | 5% |
| April 2026 | Solids, total suspended, monthly average | 14 mg/L | ≤ 12 mg/L | 17% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 15.85 mg/L | ≤ 10 mg/L | 59% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 002 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 002 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 47 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 94 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.1 mg/L | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15 mg/L | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.8 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.9 lb/d | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 28 lb/d | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 56 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 47 lb/d | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 59 lb/d | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6.3 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.5 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 25 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 14 lb/d | Jun–Aug | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | all year | 002 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 39 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 78 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 004 |
| Flow | monthly total | report only (#/mo) | all year | 004 |
| 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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