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Seneca, City of (Missouri)

Sewage treatment plant, West Seneca, Oklahoma. NPDES permit OK0030236, in force until Jan 31, 2029. Last 12 months: over a limit 3 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026E. coli, daily maximum3255 CFU/100mL≤ 406 CFU/100mL702%
July 2026E. coli, daily maximum2909 CFU/100mL≤ 406 CFU/100mL617%
September 2026E. coli, daily maximum521 CFU/100mL≤ 406 CFU/100mL28%

Limits in force (20)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 7 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
Oxygen, dissolved [DO]minimum≥ 6 mg/LJun–Oct
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≤ 225.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 3.5 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 5.3 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 26.3 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 CFU/100mLMay–Sep
E. colidaily maximum≤ 406 CFU/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 37.5 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 27 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 187.7 lb/dJan, Feb, Mar, Apr, May, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 135.1 lb/dJun–Oct

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/OK0030236 · MCP: https://passage-data.com/mcp