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Sewage treatment plant, Somerville, Ohio. NPDES permit OH0134023, in force until Apr 30, 2029. Last 12 months: over a limit 3 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 19 | ≤ 15 mg/L | 27% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 4.8 | ≤ 3 mg/L | 60% |
| November 2025 | Nitrogen, ammonia total [as N], weekly maximum | 6.2 | ≤ 4.5 mg/L | 38% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 18 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ .59 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ .89 kg/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 1.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 4.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .049 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .15 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .074 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .22 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Turbidity [severity] | monthly average | report only (severity) | all year | 001 |
| Turbidity [severity] | daily maximum | report only (severity) | all year | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 MPN/100mL | May–Oct | 001 |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 284 MPN/100mL | May–Oct | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 15 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ .49 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ .74 kg/d | all year | 001 |
| Sludge weight, dry | monthly average | report only (dry ton) | Dec | 588 |
| Sludge weight, dry | daily maximum | report only (dry ton) | Dec | 588 |
Cited limits by parameter: Ohio'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/OH0134023 · MCP: https://passage-data.com/mcp