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Sewage treatment plant, Commerce, Oklahoma. NPDES permit OK0020320 expired Jul 31, 2020; its limits still apply. Last 12 months: over a limit 20 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Oxygen, dissolved [DO], monthly minimum | 3.6 mg/L | ≥ 4 mg/L | 10% |
| October 2025 | pH, minimum | 6 SU | ≥ 6.5 SU | — |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 31.3 mg/L | ≤ 30 mg/L | 4% |
| January 2026 | pH, maximum | 10.1 SU | ≤ 9 SU | — |
| February 2026 | pH, maximum | 9.4 SU | ≤ 9 SU | — |
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 64.1 mg/L | ≤ 30 mg/L | 114% |
| March 2026 | BOD, 5-day, 20 deg. C, weekly average | 72.2 mg/L | ≤ 45 mg/L | 60% |
| March 2026 | pH, maximum | 10.1 SU | ≤ 9 SU | — |
| April 2026 | BOD, 5-day, 20 deg. C, monthly average | 34 mg/L | ≤ 25 mg/L | 36% |
| April 2026 | BOD, 5-day, 20 deg. C, weekly average | 37.6 mg/L | ≤ 37.5 mg/L | 0% |
| April 2026 | pH, maximum | 10.5 SU | ≤ 9 SU | — |
| May 2026 | BOD, 5-day, 20 deg. C, monthly average | 36.8 mg/L | ≤ 25 mg/L | 47% |
| May 2026 | BOD, 5-day, 20 deg. C, weekly average | 56.8 mg/L | ≤ 37.5 mg/L | 51% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 34 mg/L | ≤ 18 mg/L | 89% |
| June 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 41 mg/L | ≤ 27 mg/L | 52% |
| June 2026 | Oxygen, dissolved [DO], monthly minimum | 3.8 mg/L | ≥ 4 mg/L | 5% |
| June 2026 | pH, minimum | 5.7 SU | ≥ 6.5 SU | — |
| July 2026 | pH, minimum | 6.3 SU | ≥ 6.5 SU | — |
| August 2026 | pH, minimum | 4.6 SU | ≥ 6.5 SU | — |
| September 2026 | pH, maximum | 9.1 SU | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | ≥ 4 mg/L | Jun–Oct |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 3 mg/L | Apr, May |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 25 mg/L | Apr, May |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 37.5 mg/L | Apr, May |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 80.1 lb/d | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 66.7 lb/d | Apr, May |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 60 mg/L | Jun–Oct |
| Solids, total suspended | monthly average | ≤ 90 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 90 mg/L | Jun–Oct |
| Solids, total suspended | weekly average | ≤ 135 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 160.2 lb/d | Jun–Oct |
| Solids, total suspended | monthly average | ≤ 240.3 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 9 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 lb/d | Jun–Oct |
| 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 | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 27 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 48 lb/d | Jun–Oct |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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