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Sewage treatment plant, major discharger, Mishawaka, Indiana. NPDES permit IN0025640, in force until Apr 30, 2027. Last 12 months: no values over a limit. 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 | ≤ 10515 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 15772 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.8 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.1 mg/L | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 13.5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1752 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2033 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4591 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4732 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 |
| Cyanide, free [as free] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [as free] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [as free] | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [as free] | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [as free] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cyanide, free [as free] | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (lb/d) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .02 mg/L | Apr–Oct | 001 |
| Chlorine, total residual | daily maximum | < .06 mg/L | Apr–Oct | 001 |
| Chlorine, total residual | monthly average | ≤ 7 lb/d | Apr–Oct | 001 |
| Chlorine, total residual | daily maximum | < 21 lb/d | Apr–Oct | 001 |
| E. coli, colony forming units [CFU] | monthly geometric mean | report only (CFU/100mL) | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 001 |
| E. coli, colony forming units [CFU] | daily maximum | report only (CFU/100mL) | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Apr, Oct | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | May, Nov | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | May, Nov | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 8.5 tox chronic | Apr, Oct | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 8.5 tox chronic | May, Nov | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 8.5 tox chronic | May, Nov | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | Apr, Oct | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | May, Nov | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute | May, Nov | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 8.5 tox chronic | Apr, Oct | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 8.5 tox chronic | May, Nov | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 8.5 tox chronic | May, Nov | 001 |
| Mercury, total recoverable | annual average | ≤ 2.7 ng/L | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | monthly average | ≤ 4.9 ng/L | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, 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 | ≤ 8762 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 14020 lb/d | all year | 001 |
| Phosphorus, total percent removal | monthly average minimum | ≥ 75 % | all year | 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 | 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 | 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 | 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 |
| Duration | monthly total | report only (hr/mo) | all year | 012 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 012 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 012 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 012 |
| Duration | monthly total | report only (hr/mo) | all year | 013 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 013 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 013 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 013 |
| Duration | monthly total | report only (hr/mo) | all year | 014 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 014 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 014 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 014 |
| Duration | monthly total | report only (hr/mo) | all year | 015 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 015 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 015 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 015 |
| Duration | monthly total | report only (hr/mo) | all year | 016 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 016 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 016 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 016 |
| Duration | monthly total | report only (hr/mo) | all year | 018 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 018 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 018 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 018 |
| Duration | monthly total | report only (hr/mo) | all year | 019 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 019 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 019 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 019 |
| Duration | monthly total | report only (hr/mo) | all year | 020 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 020 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 020 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 020 |
| Duration | monthly total | report only (hr/mo) | all year | 021 |
| Overflow volume [SS0 volume, CSO volume] | monthly total | report only (Mgal) | all year | 021 |
| Precipitation, monthly accumulation | monthly total | report only (in/mo) | all year | 021 |
| Discharge event observation [Visual Monitoring] | monthly total | report only (#/mo) | all year | 021 |
Cited limits by parameter: Indiana's rules and the federal ones.
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