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Sewerage Systems, Zanesville, Ohio. NPDES permit OH0149080 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 12 times (last August 2026), 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, total suspended, monthly average | 29 | ≤ 12 mg/L | 142% |
| December 2025 | Solids, total suspended, weekly maximum | 29 | ≤ 18 mg/L | 61% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 11 | ≤ 10 mg/L | 10% |
| March 2026 | Solids, total suspended, monthly average | 111 | ≤ 12 mg/L | 825% |
| March 2026 | Solids, total suspended, weekly maximum | 111 | ≤ 18 mg/L | 517% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 21 | ≤ 10 mg/L | 110% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 21 | ≤ 15 mg/L | 40% |
| June 2026 | Solids, total suspended, monthly average | 16 | ≤ 12 mg/L | 33% |
| August 2026 | E. coli, MTEC-MF, monthly geometric mean | 1400 | ≤ 126 MPN/100mL | 1011% |
| August 2026 | E. coli, MTEC-MF, weekly geometric mean | 1400 | ≤ 284 MPN/100mL | 393% |
| August 2026 | Solids, total suspended, monthly average | 30 | ≤ 12 mg/L | 150% |
| August 2026 | Solids, total suspended, weekly maximum | 30 | ≤ 18 mg/L | 67% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (gal/d) | all year | 001 |
| Flow rate | daily maximum | report only (gal/d) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Mar, Jun, Aug, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Jun, Aug, Dec | 001 |
| pH | daily maximum | ≤ 9 SU | Mar, Jun, Aug, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | Mar, Jun, Aug, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ 18 mg/L | Mar, Jun, Aug, Dec | 001 |
| Solids, total suspended | monthly average | ≤ .0328 kg/d | Mar, Jun, Aug, Dec | 001 |
| Solids, total suspended | weekly maximum | ≤ .0491 kg/d | Mar, Jun, Aug, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jun, Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 4.5 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 1.5 mg/L | Jun, Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .00818 kg/d | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .00273 kg/d | Jun, Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .0123 kg/d | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .00409 kg/d | Jun, Aug | 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 | Jun, Aug | 001 |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 284 MPN/100mL | Jun, Aug | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Mar, Jun, Aug, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 15 mg/L | Mar, Jun, Aug, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ .0273 kg/d | Mar, Jun, Aug, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ .0409 kg/d | Mar, Jun, Aug, Dec | 001 |
| Sludge waste from secondary clarifiers | monthly average | report only (gal) | Dec | 588 |
| Sludge waste from secondary clarifiers | daily maximum | report only (gal) | Dec | 588 |
Cited limits by parameter: Ohio's rules and the federal ones.
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