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Tonkawa, City of

Sewage treatment plant, Tonkawa, Oklahoma. NPDES permit OK0021903, in force until Aug 31, 2031. Last 12 months: over a limit 6 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 4 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimit
January 2026pH, maximum9.19 SU≤ 9 SU
March 2026pH, maximum9.08 SU≤ 9 SU
April 2026pH, maximum9.06 SU≤ 9 SU
April 2026pH, minimum6.09 SU≥ 6.5 SU
June 2026Flow, in conduit or thru treatment plant, daily maximum.000142 MGD≤ 0 MGD
June 2026Flow, in conduit or thru treatment plant, monthly average.000015 MGD≤ 0 MGD

Limits in force (12)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 125.1 lb/dJan, Feb, Mar, Apr, Nov, Dec
pHminimum≥ 6.5 SUJan, Feb, Mar, Apr, Nov, Dec
pHmaximum≤ 9 SUJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 90 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 135 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 375.3 lb/dJan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantmonthly average≤ 0 MGDMay–Oct
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jan, Feb, Mar, Apr, Nov, Dec
Flow, in conduit or thru treatment plantdaily maximum≤ 0 MGDMay–Oct

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/OK0021903 · MCP: https://passage-data.com/mcp