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Sewage treatment plant, Big Cabin, Oklahoma. NPDES permit OK0031577, in force until Jun 30, 2031. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 27.5 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | minimum | ≥ 6.5 SU | Jan, Feb, Mar, Apr, Nov, Dec |
| pH | maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 90 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 135 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 82.6 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 0 MGD | May–Oct |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 0 MGD | May–Oct |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Feb, Mar, Apr, Nov, Dec |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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