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Sewage treatment plant, Coweta, Oklahoma. NPDES permit OK0043257, in force until Jun 30, 2031. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | E. coli, daily maximum | 580 CFU/100mL | ≤ 406 CFU/100mL | 43% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Apr, May |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3.5 mg/L | Jan, Feb, Mar, Nov, Dec |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jun–Oct |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 245.2 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | all year |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 32.7 lb/d | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| E. coli | geometric mean | ≤ 126 CFU/100mL | May–Sep |
| E. coli | daily maximum | ≤ 406 CFU/100mL | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22.5 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 122.6 lb/d | all year |
Cited limits by parameter: Oklahoma'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/OK0043257 · MCP: https://passage-data.com/mcp