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City of Cherokee

Sewage treatment plant, Cherokee, Oklahoma. NPDES permit OK0020052, in force until Dec 31, 2027. Last 12 months: over a limit 14 times (last July 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (14 values)
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
October 2025pH, maximum9.84 SU≤ 9 SU—
November 2025pH, maximum9.66 SU≤ 9 SU—
December 2025pH, maximum9.11 SU≤ 9 SU—
January 2026Solids, total suspended, monthly average42.5 mg/L≤ 30 mg/L42%
January 2026pH, maximum9.48 SU≤ 9 SU—
February 2026Solids, total suspended, monthly average33.4 mg/L≤ 30 mg/L11%
February 2026pH, maximum9.43 SU≤ 9 SU—
March 2026pH, maximum9.49 SU≤ 9 SU—
April 2026Solids, total suspended, monthly average32.2 mg/L≤ 30 mg/L7%
June 2026Solids, total suspended, monthly average43.8 mg/L≤ 30 mg/L46%
June 2026pH, maximum9.57 SU≤ 9 SU—
July 2026Solids, total suspended, monthly average42.8 mg/L≤ 30 mg/L43%
July 2026Solids, total suspended, weekly average54 mg/L≤ 45 mg/L20%
July 2026pH, maximum9.8 SU≤ 9 SU—

Limits in force (16)

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≤ 66.7 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≤ 100.1 lb/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)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. coligeometric mean≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 1175 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 235 MPN/100mLMay–Sep

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0020052 · MCP: https://passage-data.com/mcp