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Sewage treatment plant, Fairfax, Oklahoma. NPDES permit OK0029017, in force until Apr 30, 2027. Last 12 months: over a limit 2 times (last August 2026), 26 required values missing, 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | E. coli, daily maximum | 2420 MPN/100mL | ≤ 2030 MPN/100mL | 19% |
| August 2026 | E. coli, daily maximum | 1050 MPN/100mL | ≤ 406 MPN/100mL | 159% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 51.5 lb/d | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 90 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 135 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 154.6 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 |
| Chlorine, total residual | instantaneous maximum | ≤ .099 mg/L | all year |
| E. coli | geometric mean | ≤ 126 MPN/100mL | May–Sep |
| E. coli | geometric mean | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| E. coli | daily maximum | ≤ 406 MPN/100mL | May–Sep |
| E. coli | daily maximum | ≤ 2030 MPN/100mL | Jan, Feb, Mar, Apr, Oct, 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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