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Sewage treatment plant, Stigler, Oklahoma. NPDES permit OK0020711, in force until Jul 31, 2029. Last 12 months: over a limit 15 times (last May 2026), 4 required values missing, 2 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 216.22 lb/d | ≤ 120.1 lb/d | 80% |
| December 2025 | BOD, 5-day, 20 deg. C, monthly average | 66.79 mg/L | ≤ 20 mg/L | 234% |
| December 2025 | BOD, 5-day, 20 deg. C, weekly average | 192 mg/L | ≤ 30 mg/L | 540% |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 2451.7 lb/d | ≤ 120.1 lb/d | 1941% |
| January 2026 | BOD, 5-day, 20 deg. C, monthly average | 807.8 mg/L | ≤ 20 mg/L | 3939% |
| January 2026 | BOD, 5-day, 20 deg. C, weekly average | 2130 mg/L | ≤ 30 mg/L | 7000% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 10732.6 lb/d | ≤ 120.1 lb/d | 8836% |
| February 2026 | BOD, 5-day, 20 deg. C, monthly average | 2750 mg/L | ≤ 20 mg/L | 13650% |
| February 2026 | BOD, 5-day, 20 deg. C, weekly average | 4510 mg/L | ≤ 30 mg/L | 14933% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 2073.8 lb/d | ≤ 72.1 lb/d | 2776% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 459.6 mg/L | ≤ 12 mg/L | 3730% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 802 mg/L | ≤ 18 mg/L | 4356% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 2469.7 lb/d | ≤ 72.1 lb/d | 3325% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 810.3 mg/L | ≤ 12 mg/L | 6653% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], weekly average | 1580 mg/L | ≤ 18 mg/L | 8678% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jun–Oct |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | Apr, May |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jan, Feb, Mar, Nov, Dec |
| 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 | ≤ 120.1 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, May |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 10 mg/L | Jun–Oct |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | Apr, May |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 15 mg/L | Jun–Oct |
| Solids, total suspended | monthly average | ≤ 90.1 lb/d | Apr, May |
| Solids, total suspended | monthly average | ≤ 180.1 lb/d | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 60 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 6 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 24 lb/d | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 24 lb/d | Jun–Oct |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | 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 |
| E. coli | geometric mean | ≤ 126 CFU/100mL | May–Sep |
| E. coli | daily maximum | ≤ 406 CFU/100mL | May–Sep |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 8 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 12 mg/L | Apr, May |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 12 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 18 mg/L | Apr, May |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 48 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 72.1 lb/d | Apr, May |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/OK0020711 · MCP: https://passage-data.com/mcp