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Sewage treatment plant, Checotah, Oklahoma. NPDES permit OK0028100, in force until Apr 30, 2027. Last 12 months: over a limit 14 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 28.9 mg/L | ≤ 10 mg/L | 189% |
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 61.15 lb/d | ≤ 58.4 lb/d | 5% |
| October 2025 | BOD, carbonaceous [5 day, 20 C], weekly average | 32.2 mg/L | ≤ 15 mg/L | 115% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 144.7 mg/L | ≤ 10 mg/L | 1347% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 611.6 lb/d | ≤ 58.4 lb/d | 947% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 604 mg/L | ≤ 15 mg/L | 3927% |
| May 2026 | E. coli, daily maximum | 1225 CFU/100mL | ≤ 406 CFU/100mL | 202% |
| May 2026 | E. coli, geometric mean | 375.6 CFU/100mL | ≤ 126 CFU/100mL | 198% |
| June 2026 | E. coli, daily maximum | 539 CFU/100mL | ≤ 406 CFU/100mL | 33% |
| June 2026 | E. coli, geometric mean | 379.1 CFU/100mL | ≤ 126 CFU/100mL | 201% |
| July 2026 | E. coli, daily maximum | 418 CFU/100mL | ≤ 406 CFU/100mL | 3% |
| July 2026 | E. coli, geometric mean | 349.99 CFU/100mL | ≤ 126 CFU/100mL | 178% |
| August 2026 | E. coli, daily maximum | 1505 CFU/100mL | ≤ 406 CFU/100mL | 271% |
| August 2026 | E. coli, geometric mean | 570.56 CFU/100mL | ≤ 126 CFU/100mL | 353% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | Apr, May |
| Oxygen, dissolved [DO] | minimum | ≥ 5.5 mg/L | Jun–Oct |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 116.8 lb/d | Jan, Feb, Mar, Nov, Dec |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | Apr–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 87.6 lb/d | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 175.1 lb/d | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11.7 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 23.4 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 |
| 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 | ≤ 10 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 58.4 lb/d | Apr–Oct |
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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