Eufaula PWA — NPDES permit OK0035611: limits, due date and EPA's record

Sewage treatment plant, Eufaula, Oklahoma. NPDES permit OK0035611, in force until Oct 31, 2028. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
July 2026	BOD, carbonaceous [5 day, 20 C], monthly average	10.5 mg/L	≤ 10 mg/L	5%
August 2026	BOD, carbonaceous [5 day, 20 C], monthly average	10.1 mg/L	≤ 10 mg/L	1%

Limits in force (17)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	minimum	≥ 5 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 15 mg/L	all year
Solids, total suspended	weekly average	≤ 22.5 mg/L	all year
Solids, total suspended	monthly average	≤ 100.1 lb/d	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 2 mg/L	all year
Nitrogen, ammonia total [as N]	weekly average	≤ 3 mg/L	all year
Nitrogen, ammonia total [as N]	monthly average	≤ 13.3 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
Chlorine, total residual	instantaneous maximum	≤ .099 mg/L	all year
E. coli	geometric mean	≤ 126 MPN/100mL	May–Sep
E. coli	daily maximum	≤ 235 MPN/100mL	May–Sep
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 10 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	weekly average	≤ 15 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 66.7 lb/d	all year

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/OK0035611 · MCP: https://passage-data.com/mcp