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Afton PWA

Sewage treatment plant, Afton, Oklahoma. NPDES permit OK0020656, in force until Sep 30, 2029. Last 12 months: over a limit 8 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (17 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 99 required values missing, 7 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average21.8 mg/L≤ 20 mg/L9%
December 2025BOD, 5-day, 20 deg. C, weekly average55 mg/L≤ 30 mg/L83%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average18 mg/L≤ 10 mg/L80%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average49 mg/L≤ 15 mg/L227%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average11.7 mg/L≤ 10 mg/L17%
July 2026BOD, carbonaceous [5 day, 20 C], weekly average29 mg/L≤ 15 mg/L93%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average13.7 mg/L≤ 10 mg/L37%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average35 mg/L≤ 15 mg/L133%

Limits in force (28)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 3 mg/LApr–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 23.4 lb/dJan, Feb, Mar, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LApr–Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedweekly average≤ 22.5 mg/LApr–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedmonthly average≤ 17.5 lb/dApr–Oct
Solids, total suspendedmonthly average≤ 35 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LApr, May
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJun–Oct
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LApr, May
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 7 lb/dApr, May
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 CFU/100mLMay–Sep
E. coligeometric mean≤ 630 CFU/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 406 CFU/100mLMay–Sep
E. colidaily maximum≤ 2030 CFU/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 11.7 lb/dApr–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/OK0020656 · MCP: https://passage-data.com/mcp