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Davis, City of

Sewage treatment plant, Davis, Oklahoma. NPDES permit OK0021644, in force until Oct 31, 2028. Last 12 months: over a limit 20 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
55 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average263.86 lb/d≤ 63.4 lb/d316%
October 2025BOD, 5-day, 20 deg. C, monthly average81.3 mg/L≤ 20 mg/L307%
October 2025BOD, 5-day, 20 deg. C, weekly average102 mg/L≤ 30 mg/L240%
October 2025Solids, total suspended, monthly average210.23 lb/d≤ 95.1 lb/d121%
October 2025Solids, total suspended, monthly average65 mg/L≤ 30 mg/L117%
October 2025Solids, total suspended, weekly average68 mg/L≤ 45 mg/L51%
November 2025BOD, 5-day, 20 deg. C, monthly average269.08 lb/d≤ 63.4 lb/d324%
November 2025BOD, 5-day, 20 deg. C, monthly average55.4 mg/L≤ 20 mg/L177%
November 2025BOD, 5-day, 20 deg. C, weekly average61.6 mg/L≤ 30 mg/L105%
November 2025Solids, total suspended, monthly average405.49 lb/d≤ 95.1 lb/d326%
November 2025Solids, total suspended, monthly average85 mg/L≤ 30 mg/L183%
November 2025Solids, total suspended, weekly average90 mg/L≤ 45 mg/L100%
December 2025BOD, 5-day, 20 deg. C, monthly average182.19 lb/d≤ 63.4 lb/d187%
December 2025BOD, 5-day, 20 deg. C, monthly average52.45 mg/L≤ 20 mg/L162%
December 2025BOD, 5-day, 20 deg. C, weekly average58.8 mg/L≤ 30 mg/L96%
December 2025Solids, total suspended, monthly average337.9 lb/d≤ 95.1 lb/d255%
December 2025Solids, total suspended, monthly average97.5 mg/L≤ 30 mg/L225%
December 2025Solids, total suspended, weekly average115 mg/L≤ 45 mg/L156%
March 2026pH, minimum6.32 SU≥ 6.5 SU—
September 2026E. coli, daily maximum2420 MPN/100mL≤ 406 MPN/100mL496%

Limits in force (12)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 63.4 lb/dall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 95.1 lb/dall 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
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 406 MPN/100mLMay–Sep

How strict are these limits?

Cited limits by parameter: Oklahoma's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/OK0021644 · MCP: https://passage-data.com/mcp