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Porter PWA

Sewage treatment plant, Porter, Oklahoma. NPDES permit OK0027570, in force until Jun 30, 2028. Last 12 months: over a limit 8 times (last June 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (12 values)
Renewal application due: Jan 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file: August 2026
Oct 2024 – Sep 2025: 8 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
February 2026	BOD, 5-day, 20 deg. C, monthly average	33.4 mg/L	≤ 20 mg/L	67%
February 2026	BOD, 5-day, 20 deg. C, weekly average	33.4 mg/L	≤ 30 mg/L	11%
March 2026	BOD, 5-day, 20 deg. C, monthly average	45.2 mg/L	≤ 20 mg/L	126%
March 2026	BOD, 5-day, 20 deg. C, weekly average	45.2 mg/L	≤ 30 mg/L	51%
April 2026	BOD, 5-day, 20 deg. C, monthly average	46.4 mg/L	≤ 20 mg/L	132%
April 2026	BOD, 5-day, 20 deg. C, weekly average	46.4 mg/L	≤ 30 mg/L	55%
May 2026	E. coli, daily maximum	570 CFU/100mL	≤ 406 CFU/100mL	40%
June 2026	E. coli, daily maximum	545 CFU/100mL	≤ 406 CFU/100mL	34%

Limits in force (12)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	monthly average	≤ 20 mg/L	all year
BOD, 5-day, 20 deg. C	weekly average	≤ 30 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 12.3 lb/d	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Solids, total suspended	weekly average	≤ 45 mg/L	all year
Solids, total suspended	monthly average	≤ 18.5 lb/d	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
E. coli	geometric mean	≤ 126 CFU/100mL	May–Sep
E. coli	daily maximum	≤ 406 CFU/100mL	May–Sep

How strict are these limits?

BOD, 5-day, 20 deg. C, monthly average 20 mg/L — stricter than 60% of 158 other minor POTWs in Oklahoma; 38% have the same limit
BOD, 5-day, 20 deg. C, weekly average 30 mg/L — stricter than 60% of 152 other minor POTWs in Oklahoma; 38% have the same limit
Solids, total suspended, monthly average 30 mg/L — stricter than 44% of 176 other minor POTWs in Oklahoma; 34% have the same limit

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/OK0027570 · MCP: https://passage-data.com/mcp