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Sewage treatment plant, Metamora, Illinois. NPDES permit IL0060461, in force until Jan 31, 2029. Last 12 months: over a limit 9 times (last April 2026), 8 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | 001 | Nitrogen, ammonia total [as N], monthly average | 2.8 mg/L | ≤ 1.4 mg/L | 100% |
| November 2025 | 003 | Nitrogen, ammonia total [as N], daily maximum | 9.3 mg/L | ≤ 4.3 mg/L | 116% |
| November 2025 | 003 | Nitrogen, ammonia total [as N], monthly average | 9.3 mg/L | ≤ 3.4 mg/L | 174% |
| March 2026 | 001 | Nitrogen, ammonia total [as N], monthly average | 1.7 mg/L | ≤ 1.4 mg/L | 21% |
| March 2026 | 002 | Nitrogen, ammonia total [as N], daily maximum | 8.4 mg/L | ≤ 4.2 mg/L | 100% |
| March 2026 | 002 | Nitrogen, ammonia total [as N], monthly average | 8.4 mg/L | ≤ 1.4 mg/L | 500% |
| March 2026 | 002 | Nitrogen, ammonia total [as N], weekly average | 8.4 mg/L | ≤ 3.5 mg/L | 140% |
| March 2026 | 003 | Nitrogen, ammonia total [as N], monthly average | 1.5 mg/L | ≤ 1.4 mg/L | 7% |
| April 2026 | 001 | Nitrogen, ammonia total [as N], monthly average | 2.3 mg/L | ≤ 1.4 mg/L | 64% |
| 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 | ≤ 3.6 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 7.1 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.4 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.2 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .42 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .27 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.2 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.3 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.3 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.5 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ .68 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 lb/d | Mar, Apr, May, Sep, Oct | 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 | all year | 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 | ≤ 3 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 5.9 lb/d | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 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] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 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 | ≤ 3.6 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 7.1 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.4 mg/L | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.2 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .42 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .27 lb/d | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 lb/d | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.2 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 lb/d | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.3 lb/d | Jan, Feb, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.5 mg/L | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.3 mg/L | Jun–Aug | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 lb/d | Mar, Apr, May, Sep, Oct | 002 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ .68 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 | ≤ 3 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 5.9 lb/d | all year | 002 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 003 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 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 | ≤ 3.6 lb/d | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 7.1 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .9 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.4 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.2 mg/L | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .42 lb/d | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .27 lb/d | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.2 lb/d | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.5 lb/d | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.3 lb/d | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.5 mg/L | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.3 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1 lb/d | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ .68 lb/d | Jun–Aug | 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 | report only (#/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 | ≤ 3 lb/d | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 5.9 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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