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Oklahoma Department of Corrections

Sewage treatment plant, Hodgen, Oklahoma. NPDES permit OK0022951, in force until Jun 30, 2030. Last 12 months: over a limit 13 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (19 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 13 values over a limit
Period endingParameterReportedLimitOver by
December 2025pH, minimum6.11 SU≥ 6.5 SU—
January 2026BOD, 5-day, 20 deg. C, monthly average36.1 mg/L≤ 30 mg/L20%
January 2026pH, minimum5.73 SU≥ 6.5 SU—
February 2026pH, minimum5.84 SU≥ 6.5 SU—
March 2026BOD, 5-day, 20 deg. C, monthly average23.14 lb/d≤ 20 lb/d16%
March 2026BOD, 5-day, 20 deg. C, monthly average36.5 mg/L≤ 30 mg/L22%
March 2026pH, minimum5.14 SU≥ 6.5 SU—
April 2026pH, minimum5.4 SU≥ 6.5 SU—
May 2026pH, minimum5.38 SU≥ 6.5 SU—
June 2026pH, minimum5.63 SU≥ 6.5 SU—
July 2026pH, minimum6.04 SU≥ 6.5 SU—
September 2026Oxygen, dissolved [DO], instantaneous minimum4.81 mg/L≥ 5.5 mg/L13%
September 2026pH, minimum6.29 SU≥ 6.5 SU—

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5.5 mg/LJun–Oct
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LMar–May
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 20 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 90 mg/Lall year
Solids, total suspendedweekly average≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 60 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 6.5 mg/LJun–Oct
Nitrogen, ammonia total [as N]weekly average≤ 9.7 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 4.3 lb/dJun–Oct
Phosphorus, total [as P]monthly averagereport only (ug/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .099 mg/Lall year
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 406 MPN/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13.3 lb/dJun–Oct

How strict are these limits?

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/OK0022951 · MCP: https://passage-data.com/mcp