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Sewage treatment plant, major discharger, Plymouth, Indiana. NPDES permit IN0020991, in force until Jul 31, 2030. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Solids, total suspended, monthly average | 1462 lb/d | ≤ 1322 lb/d | 11% |
| March 2026 | Solids, total suspended, monthly average | 55.8 mg/L | ≤ 24 mg/L | 133% |
| March 2026 | Solids, total suspended, maximum weekly average | 181.7 mg/L | ≤ 36 mg/L | 405% |
| March 2026 | Solids, total suspended, maximum weekly average | 4771 lb/d | ≤ 1983 lb/d | 141% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 22 mg/L | May–Nov | 001 |
| Solids, total suspended | maximum weekly average | ≤ 36 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | maximum weekly average | ≤ 33 mg/L | May–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 1322 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 1212 lb/d | May–Nov | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1983 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1818 lb/d | May–Nov | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 3 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 4.5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 110 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 165 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 165 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 248 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute (alert, not enforceable) | Jan, Jul | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Jan, Jul | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute (alert, not enforceable) | Jan, Jul | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Jan, Jul | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Feb, Aug | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 2.6 tox chronic (alert, not enforceable) | Feb, Aug | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 18 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 27 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1102 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 991 lb/d | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 1652 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 1487 lb/d | May–Nov | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Duration | monthly total | report only (hr/mo) | all year | 002 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 002 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 002 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 002 |
| Duration | monthly total | report only (hr/mo) | all year | 003 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 003 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 003 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 003 |
| Duration | monthly total | report only (hr/mo) | all year | 004 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 004 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 004 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 004 |
| Duration | monthly total | report only (hr/mo) | all year | 005 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 005 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 005 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 005 |
| Duration | monthly total | report only (hr/mo) | all year | 006 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 006 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 006 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 006 |
| Duration | monthly total | report only (hr/mo) | all year | 007 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 007 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 007 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 007 |
| Duration | monthly total | report only (hr/mo) | all year | 008 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 008 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 008 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 008 |
| Duration | monthly total | report only (hr/mo) | all year | 009 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 009 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 009 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 009 |
| Duration | monthly total | report only (hr/mo) | all year | 010 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 010 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 010 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 010 |
| Duration | monthly total | report only (hr/mo) | all year | 011 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 011 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 011 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 011 |
Cited limits by parameter: Indiana's rules and the federal ones.
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