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Sewage treatment plant, major discharger, Mount Vernon, Indiana. NPDES permit IN0035696, in force until Dec 31, 2030. Last 12 months: no values over a limit, 47 required values missing, 13 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.
| 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 | ≤ 1026 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1540 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 | ≤ 2.8 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9.3 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 4.2 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 14 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 95.8 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 318.2 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 143.7 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 497 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/d) | all year | 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 | Jul | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Jun | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | Jul | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | Jun | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 2000 #/100mL | Jan, Feb, Mar, Nov, Dec | 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 | ≤ 855 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 1369 lb/d | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| TU Static 48Hr Acute Daphnia magna | maximum | ≤ 1 tox acute | Jul | 001 |
| TU Static 48Hr Acute Daphnia magna | maximum | ≤ 1 tox acute | all year | 001 |
| TU Static 48Hr Acute Daphnia pulex | maximum | ≤ 1 tox acute | Jul | 001 |
| TU Static 48Hr Acute Daphnia pulex | maximum | ≤ 1 tox acute | 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 |
| Copper, dry weight | value | report only (mg/kg) | Jun, Dec | PRT |
| Cadmium, dry weight | value | report only (mg/kg) | Jun, Dec | PRT |
| Molybdenum, sludge, total, dry weight [as Mo] | value | report only (mg/kg) | Jun, Dec | PRT |
| Zinc, sludge, total, dry weight [as Zn] | value | report only (mg/kg) | Jun, Dec | PRT |
| Lead, sludge, total, dry weight [as Pb] | value | report only (mg/kg) | Jun, Dec | PRT |
| Nickel, sludge, total, dry weight [as Ni] | value | report only (mg/kg) | Jun, Dec | PRT |
| Mercury, sludge, total, dry weight [as Hg] | value | report only (mg/kg) | Jun, Dec | PRT |
Cited limits by parameter: Indiana'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/IN0035696 · MCP: https://passage-data.com/mcp