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Sewage treatment plant, major discharger, West Lafayette, Indiana. NPDES permit IN0024821, in force until Jan 31, 2031. Last 12 months: over a limit 2 times (last August 2026), 1 of 55 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | E. coli, colony forming units [CFU], daily maximum | 24138 CFU/100mL | ≤ 235 CFU/100mL | 10171% |
| August 2026 | E. coli, colony forming units [CFU], daily maximum | 42519 CFU/100mL | ≤ 235 CFU/100mL | 17993% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 4506 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 6759 lb/d | all year | 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 | ≤ 3 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 4.5 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 9 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 451 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 901 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 676 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1352 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 |
| Chlorine, total residual | monthly average | < .06 mg/L | Apr–Oct | 001 |
| Chlorine, total residual | daily maximum | < .06 mg/L | Apr–Oct | 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 | Aug | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 14.8 tox chronic | Aug | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | Aug | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 14.8 tox chronic | Aug | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 3755 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 6008 lb/d | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| 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 | 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 |
| pH | daily minimum | report only (SU) | all year | 007 |
| pH | daily maximum | report only (SU) | all year | 007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 007 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Chlorine, total residual | monthly average | < .06 mg/L | Apr–Oct | 007 |
| Chlorine, total residual | daily maximum | < .06 mg/L | Apr–Oct | 007 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 007 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 007 |
| E. coli, colony forming units [CFU] | daily maximum | report only (CFU/100mL) | Apr–Oct | 007 |
| Number of Events | monthly total | report only (# exceed) | all year | 007 |
| Number of Events | monthly total | report only (#) | all year | 007 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 007 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 007 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 007 |
Cited limits by parameter: Indiana's rules and the federal ones.
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