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Sewage treatment plant, major discharger, Columbia City, Indiana. NPDES permit IN0022624, in force until Dec 31, 2027. Last 12 months: over a limit 11 times (last August 2026), 1 of 139 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], maximum weekly average | 5.456 mg/L | ≤ 2.3 mg/L | 137% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 3.4124 mg/L | ≤ 3 mg/L | 14% |
| December 2025 | Nitrogen, ammonia total [as N], maximum weekly average | 6.622 mg/L | ≤ 4.5 mg/L | 47% |
| January 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 6.23 mg/L | ≤ 4.5 mg/L | 38% |
| April 2026 | E. coli, colony forming units [CFU], daily maximum | 300 CFU/100mL | ≤ 235 CFU/100mL | 28% |
| April 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 8.264 mg/L | ≤ 4.5 mg/L | 84% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 2.4984 mg/L | ≤ 1.5 mg/L | 67% |
| June 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 3.144 mg/L | ≤ 2.3 mg/L | 37% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 2.604 mg/L | ≤ 1.5 mg/L | 74% |
| July 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 5.192 mg/L | ≤ 2.3 mg/L | 126% |
| August 2026 | E. coli, colony forming units [CFU], daily maximum | 651 CFU/100mL | ≤ 235 CFU/100mL | 177% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | May–Nov | 001 |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 18 mg/L | May–Nov | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | maximum weekly average | ≤ 27 mg/L | May–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 2879 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 1727 lb/d | May–Nov | 001 |
| Solids, total suspended | maximum weekly average | ≤ 4319 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | maximum weekly average | ≤ 2591 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 | ≤ 1.5 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 | ≤ 2.3 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 | ≤ 144 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 288 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 221 lb/d | May–Nov | 001 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 432 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 |
| 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 |
| 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 |
| 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 |
| 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) | Dec | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute (alert, not enforceable) | Jan | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 1.2 tox chronic (alert, not enforceable) | Dec | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 1.2 tox chronic (alert, not enforceable) | Jan | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute (alert, not enforceable) | Dec | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1 tox acute (alert, not enforceable) | Jan | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1.2 tox chronic (alert, not enforceable) | Dec | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | maximum | ≤ 1.2 tox chronic (alert, not enforceable) | Jan | 001 |
| Mercury, total recoverable | monthly average | ≤ 12 ng/L | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | ≤ 20 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 | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 23 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2399 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1440 lb/d | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 3839 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 2207 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 | 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 | 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 | 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 | 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 |
| pH | daily minimum | report only (SU) | all year | 019 |
| pH | daily maximum | report only (SU) | all year | 019 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 019 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 019 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 019 |
| Flow, in conduit or thru treatment plant | maximum weekly average | report only (MGD) | all year | 019 |
| Chlorine, total residual | monthly average | < .06 mg/L | Apr–Oct | 019 |
| Chlorine, total residual | daily maximum | < .06 mg/L | Apr–Oct | 019 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 019 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 019 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 019 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 019 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 019 |
| 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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