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Sewerage Systems, Afton, Oklahoma. NPDES permit OK0021458, in force until Apr 30, 2028. Last 12 months: over a limit 2 times (last July 2026), 13 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Chlorine, total residual, instantaneous maximum | 2.2 mg/L | < .099 mg/L | 2122% |
| July 2026 | E. coli, daily maximum | 2000 CFU/100mL | ≤ 235 CFU/100mL | 751% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 4.2 lb/d | all year |
| 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 | ≤ 6.3 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 CFU/100mL | May–Sep |
| E. coli | daily maximum | ≤ 235 CFU/100mL | May–Sep |
| Coliform, total general | geometric mean | ≤ 5000 CFU/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Coliform, total general | daily maximum | ≤ 20000 CFU/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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