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OG&E-Muskogee 4, 5, & 6

Electric Services, major discharger, Fort Gibson, Oklahoma. NPDES permit OK0034657, in force until Oct 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (7 values), outfall 0A1 form A monthly (4 values), outfall 0B1 form A monthly (8 values), outfall 0C1 form A monthly (4 values), outfall 0E1 form A monthly (6 values), outfall B1A form A monthly (5 values), and 3 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 78 reports late

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Oxidants, total residualinstantaneous maximum≤ .099 mg/Lall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. coligeometric mean≤ 126 MPN/100mLMay–Sep001
E. coligeometric mean≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily minimum≥ 406 MPN/100mLMay–Sep001
E. colidaily maximum≤ 2030 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
pHminimum≥ 6 SUall year0A1
pHmaximum≤ 9 SUall year0A1
Oxidants, free availablemonthly average≤ .2 mg/Lall year0A1
Oxidants, free availabledaily maximum≤ .5 mg/Lall year0A1
Oxidants, free availablemonthly averagereport only (lb/d)all year0A1
Oxidants, free availabledaily maximumreport only (lb/d)all year0A1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year0A1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year0A1
pHminimum≥ 6 SUall year0B1
pHmaximum≤ 9 SUall year0B1
Solids, total suspendedmonthly average≤ 30 mg/Lall year0B1
Solids, total suspendeddaily maximum≤ 100 mg/Lall year0B1
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year0B1
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year0B1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year0B1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year0B1
pHminimum≥ 6 SUall year0C1
pHmaximum≤ 9 SUall year0C1
Oxidants, free availablemonthly average≤ .2 mg/Lall year0C1
Oxidants, free availabledaily maximum≤ .5 mg/Lall year0C1
Oxidants, free availablemonthly averagereport only (lb/d)all year0C1
Oxidants, free availabledaily maximumreport only (lb/d)all year0C1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year0C1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year0C1
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year0E1
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year0E1
Solids, total suspendedmonthly average≤ 30 mg/Lall year0E1
Solids, total suspendeddaily maximum≤ 45 mg/Lall year0E1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year0E1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year0E1
pHminimum≥ 6 SUall yearB1A
pHmaximum≤ 9 SUall yearB1A
Solids, total suspendeddaily maximum≤ 50 mg/Lall yearB1A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB1A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB1A
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX1
LC50 Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX1
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX1
LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (pass=0;fail=1)all yearTX1
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX1
%Mortality Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (%)all yearTX1
% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48-hour minimumreport only (%)all yearTX1

How strict are these limits?

Cited limits by parameter: Oklahoma's rules and the federal ones.

Same industry: the 25 Electric Services permits in Oklahoma.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0034657 · MCP: https://passage-data.com/mcp