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Sewage treatment plant, Calera, Oklahoma. NPDES permit OK0031682, in force until Nov 30, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Apr, May |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 3 mg/L | Jan, Feb, Mar, Nov, Dec |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 4 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 | ≤ 87.6 lb/d | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 7.5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 10.5 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 14.6 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20.4 lb/d | Apr, May |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 18 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Apr, May |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 12 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22.5 mg/L | Apr, May |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 18 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 52.5 lb/d | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 43.8 lb/d | Apr, May |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 35 lb/d | Jun–Oct |
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/OK0031682 · MCP: https://passage-data.com/mcp