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Sewerage Systems, Westerville, Ohio. NPDES permit OH0055239 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 40 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | pH, daily maximum | 9.2 | ≤ 9 SU | — |
| February 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 4.3 | ≤ 4 kg/d | 8% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 16.5 | ≤ 10 mg/L | 65% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 8.84 | ≤ 2.7 kg/d | 227% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 25.7 | ≤ 4 kg/d | 543% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 43.2 | ≤ 15 mg/L | 188% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 2.842 | ≤ 1.8 kg/d | 58% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 9.715 | ≤ 6.8 mg/L | 43% |
| March 2026 | Nitrogen, ammonia total [as N], weekly maximum | 11.92 | ≤ 10.2 mg/L | 17% |
| March 2026 | Nitrogen, ammonia total [as N], weekly maximum | 3.383 | ≤ 2.71 kg/d | 25% |
| March 2026 | Solids, total suspended, monthly average | 13 | ≤ 3.2 kg/d | 306% |
| March 2026 | Solids, total suspended, monthly average | 25 | ≤ 12 mg/L | 108% |
| March 2026 | Solids, total suspended, weekly maximum | 28 | ≤ 4.8 kg/d | 483% |
| March 2026 | Solids, total suspended, weekly maximum | 47 | ≤ 18 mg/L | 161% |
| April 2026 | Nitrogen, ammonia total [as N], monthly average | 7.74 | ≤ 6.8 mg/L | 14% |
| April 2026 | Nitrogen, ammonia total [as N], weekly maximum | 11.46 | ≤ 10.2 mg/L | 12% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | .815 | ≤ .4 kg/d | 104% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 4.62 | ≤ 1.5 mg/L | 208% |
| May 2026 | Nitrogen, ammonia total [as N], weekly maximum | 1.3 | ≤ .6 kg/d | 117% |
| May 2026 | Nitrogen, ammonia total [as N], weekly maximum | 8 | ≤ 2.3 mg/L | 248% |
| June 2026 | E. coli, MTEC-MF, monthly geometric mean | 2100 | ≤ 126 MPN/100mL | 1567% |
| June 2026 | E. coli, MTEC-MF, weekly geometric mean | 2100 | ≤ 284 MPN/100mL | 639% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 1.85 | ≤ .4 kg/d | 363% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 6.08 | ≤ 1.5 mg/L | 305% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 10 | ≤ 2.3 mg/L | 335% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 3.52 | ≤ .6 kg/d | 487% |
| July 2026 | E. coli, MTEC-MF, monthly geometric mean | 2850 | ≤ 126 MPN/100mL | 2162% |
| July 2026 | E. coli, MTEC-MF, weekly geometric mean | 2850 | ≤ 284 MPN/100mL | 904% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 1.92 | ≤ .4 kg/d | 380% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 9.85 | ≤ 1.5 mg/L | 557% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 1.97 | ≤ .6 kg/d | 228% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 11.8 | ≤ 2.3 mg/L | 413% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 2.9 | ≤ 2.7 kg/d | 7% |
| August 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 9.1 | ≤ 4 kg/d | 128% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 3.03 | ≤ 1.5 mg/L | 102% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 3.45 | ≤ .4 kg/d | 763% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 5.84 | ≤ 2.3 mg/L | 154% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 6.87 | ≤ .6 kg/d | 1045% |
| August 2026 | Solids, total suspended, monthly average | 5.6 | ≤ 3.2 kg/d | 75% |
| August 2026 | Solids, total suspended, weekly maximum | 18 | ≤ 4.8 kg/d | 275% |
| 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 | ≤ 3.2 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 4.8 kg/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2.3 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 10.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .4 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 kg/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ .6 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2.71 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 | ≤ 2.7 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 4 kg/d | all year | 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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Your permit document is the final word. As JSON: /api/v1/permits/OH0055239 · MCP: https://passage-data.com/mcp