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Sewage treatment plant, Perrysville, Indiana. NPDES permit IN0054208, in force until Aug 31, 2030. Last 12 months: over a limit 18 times (last June 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 1.48 mg/L | ≤ 1.1 mg/L | 35% |
| November 2025 | Nitrogen, ammonia total [as N], maximum weekly average | 3.67 mg/L | ≤ 1.6 mg/L | 129% |
| November 2025 | Oxygen, dissolved [DO], daily average minimum | 5.9 mg/L | ≥ 6 mg/L | 2% |
| November 2025 | Solids, total suspended, monthly average | 15.9 mg/L | ≤ 10 mg/L | 59% |
| November 2025 | Solids, total suspended, maximum weekly average | 26.8 mg/L | ≤ 15 mg/L | 79% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 13 mg/L | ≤ 1.6 mg/L | 713% |
| December 2025 | Nitrogen, ammonia total [as N], maximum weekly average | 21.8 mg/L | ≤ 2.4 mg/L | 808% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 3.25 mg/L | ≤ 1.6 mg/L | 103% |
| January 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 2.6 mg/L | ≤ 2.4 mg/L | 8% |
| January 2026 | Solids, total suspended, monthly average | 13.6 mg/L | ≤ 10 mg/L | 36% |
| January 2026 | Solids, total suspended, maximum weekly average | 15.6 mg/L | ≤ 15 mg/L | 4% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 4.6 mg/L | ≤ 1.6 mg/L | 188% |
| February 2026 | Nitrogen, ammonia total [as N], maximum weekly average | 7 mg/L | ≤ 2.4 mg/L | 192% |
| February 2026 | Solids, total suspended, monthly average | 26.5 mg/L | ≤ 10 mg/L | 165% |
| February 2026 | Solids, total suspended, maximum weekly average | 32.2 mg/L | ≤ 15 mg/L | 115% |
| March 2026 | Solids, total suspended, monthly average | 15.1 mg/L | ≤ 10 mg/L | 51% |
| March 2026 | Solids, total suspended, maximum weekly average | 21 mg/L | ≤ 15 mg/L | 40% |
| June 2026 | E. coli, colony forming units [CFU], daily maximum | 238 CFU/100mL | ≤ 235 CFU/100mL | 1% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | May–Nov |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 5 mg/L | Jan, Feb, Mar, Apr, Dec |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year |
| Solids, total suspended | maximum weekly average | ≤ 15 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 2.3 lb/d | all year |
| Solids, total suspended | maximum weekly average | ≤ 3.4 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | May–Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.6 mg/L | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 1.6 mg/L | May–Nov |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ 2.4 mg/L | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .2 lb/d | May–Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 lb/d | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ .4 lb/d | May–Nov |
| Nitrogen, ammonia total [as N] | maximum weekly average | ≤ .5 lb/d | Jan, Feb, Mar, Apr, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 125 CFU/100mL | Apr–Oct |
| E. coli, colony forming units [CFU] | daily maximum | ≤ 235 CFU/100mL | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 15 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2.3 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 3.4 lb/d | all year |
| Flow, total | monthly total | report only (Mgal/mo) | all year |
Cited limits by parameter: Indiana's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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