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Sewage treatment plant, Middlebury, Indiana. NPDES permit IN0023761, in force until May 31, 2027. Last 12 months: no values over a limit, 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | May–Nov | 002 |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 3 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 247.8 lb/d | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 371.8 lb/d | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.8 mg/L | May–Nov | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.2 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13 mg/L | May–Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14 mg/L | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 47.9 lb/d | May–Nov | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 51.2 lb/d | Jan, Feb, Mar, Apr, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 107.4 lb/d | May–Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 115.7 lb/d | Jan, Feb, Mar, Apr, Dec | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 002 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 002 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | May | 002 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Jun | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 5.7 tox chronic | May | 002 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 5.7 tox chronic | Jun | 002 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | May | 002 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | Jun | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 5.7 tox chronic | May | 002 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 5.7 tox chronic | Jun | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 206.5 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 330.5 lb/d | all year | 002 |
| Phosphorus, total percent removal | monthly average minimum | ≥ 80 % | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Copper, dry weight | value | report only (mg/kg) | Jun, Dec | PRT |
| Copper, dry weight | value | report only (mg/kg) | Jun, Dec | PRT |
| Cadmium, 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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/IN0023761 · MCP: https://passage-data.com/mcp