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Sewage treatment plant, major discharger, Paoli, Indiana. NPDES permit IN0024023, in force until Feb 29, 2028. Last 12 months: over a limit 31 times (last August 2026), 4 required values missing, 14 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 10.9 mg/L | ≤ 10 mg/L | 9% |
| January 2026 | Phosphorus, total [as P], monthly average | 1.1019 mg/L | ≤ 1 mg/L | 10% |
| January 2026 | pH, daily maximum | 9.6 SU | ≤ 9 SU | — |
| March 2026 | pH, daily maximum | 9.3 SU | ≤ 9 SU | — |
| April 2026 | E. coli, colony forming units [CFU], daily maximum | > 2419 CFU/100mL | ≤ 235 CFU/100mL | — |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 19.989 mg/L | ≤ 1.6 mg/L | 1149% |
| April 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 26.731 mg/L | ≤ 2.4 mg/L | 1014% |
| May 2026 | E. coli, colony forming units [CFU], daily maximum | 260 CFU/100mL | ≤ 235 CFU/100mL | 11% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 5.7361 mg/L | ≤ 1.1 mg/L | 421% |
| May 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 50.657 lb/d | ≤ 50 lb/d | 1% |
| May 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 8.8277 mg/L | ≤ 1.6 mg/L | 452% |
| May 2026 | Oxygen, dissolved [DO], daily average minimum | 5.29 mg/L | ≥ 6 mg/L | 12% |
| June 2026 | E. coli, colony forming units [CFU], daily maximum | 649 CFU/100mL | ≤ 235 CFU/100mL | 176% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 145.32 lb/d | ≤ 34 lb/d | 327% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 17.428 mg/L | ≤ 1.1 mg/L | 1484% |
| June 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 33.088 mg/L | ≤ 1.6 mg/L | 1968% |
| June 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 452.79 lb/d | ≤ 50 lb/d | 806% |
| June 2026 | Phosphorus, total [as P], monthly average | 1.1179 mg/L | ≤ 1 mg/L | 12% |
| June 2026 | pH, daily minimum | 5.8 SU | ≥ 6 SU | — |
| June 2026 | pH, daily maximum | 10 SU | ≤ 9 SU | — |
| July 2026 | E. coli, colony forming units [CFU], daily maximum | 387 CFU/100mL | ≤ 235 CFU/100mL | 65% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 22.741 mg/L | ≤ 1.1 mg/L | 1967% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 50.572 lb/d | ≤ 34 lb/d | 49% |
| July 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 165.74 lb/d | ≤ 50 lb/d | 231% |
| July 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 35.3 mg/L | ≤ 1.6 mg/L | 2106% |
| July 2026 | pH, daily minimum | 5.2 SU | ≥ 6 SU | — |
| July 2026 | pH, daily maximum | 9.2 SU | ≤ 9 SU | — |
| August 2026 | E. coli, colony forming units [CFU], daily maximum | 738 CFU/100mL | ≤ 235 CFU/100mL | 214% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 3.0246 mg/L | ≤ 1.1 mg/L | 175% |
| August 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 4.3983 mg/L | ≤ 1.6 mg/L | 175% |
| August 2026 | pH, daily minimum | 5.1 SU | ≥ 6 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | all year | 008 |
| pH | daily minimum | ≥ 6 SU | all year | 008 |
| pH | daily maximum | ≤ 9 SU | all year | 008 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 008 |
| Solids, total suspended | maximum weekly average | ≤ 18 mg/L | all year | 008 |
| Solids, total suspended | monthly average | ≤ 370 lb/d | all year | 008 |
| Solids, total suspended | maximum weekly average | ≤ 560 lb/d | all year | 008 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 008 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 008 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | May–Nov | 008 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.6 mg/L | Jan, Feb, Mar, Apr, Dec | 008 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1.6 mg/L | May–Nov | 008 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 2.4 mg/L | Jan, Feb, Mar, Apr, Dec | 008 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 34 lb/d | May–Nov | 008 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 50 lb/d | Jan, Feb, Mar, Apr, Dec | 008 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 50 lb/d | May–Nov | 008 |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 74 lb/d | Jan, Feb, Mar, Apr, Dec | 008 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 008 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 008 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 008 |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct | 008 |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct | 008 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 008 |
| Mercury, total recoverable | daily maximum | report only (ng/L) | Feb, Apr, Jun, Aug, Oct, Dec | 008 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 008 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 15 mg/L | all year | 008 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 310 lb/d | all year | 008 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 470 lb/d | all year | 008 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 008 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Toxicity [acute], Ceriodaphnia dubia, maximum | 1 tox acute (Aug) | Mar 1, 2027 | new | — | — |
| Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum | 1 tox acute (Aug) | Mar 1, 2027 | new | — | — |
| Toxicity [chronic], Ceriodaphnia dubia, maximum | 1 tox chronic (Aug) | Mar 1, 2027 | new | — | — |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow], maximum | 1 tox chronic (Aug) | Mar 1, 2027 | new | — | — |
| Toxicity [acute], Ceriodaphnia dubia, maximum | 1 tox acute (Sep) | Apr 1, 2027 | new | — | — |
| Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum | 1 tox acute (Sep) | Apr 1, 2027 | new | — | — |
| Toxicity [chronic], Ceriodaphnia dubia, maximum | 1 tox chronic (Sep) | Apr 1, 2027 | new | — | — |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow], maximum | 1 tox chronic (Sep) | Apr 1, 2027 | new | — | — |
Cited limits by parameter: Indiana's rules and the federal ones.
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