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Public Service CO-Southwestern

Electric Services, major discharger, Washita, Oklahoma. NPDES permit OK0000094, in force until Dec 31, 2026. 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 (4 values), outfall 002 form A monthly (5 values), outfall 003 form A monthly (5 values), outfall 201 form A monthly (6 values), outfall 202 form A monthly (6 values), outfall TX1 form Q quarterly (8 values), and 5 more forms
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 76 reports late

Limits in force (58)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendeddaily maximum≤ 100 mg/Lall year001
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year001
Oil and grease, hexane extr methoddaily maximum≤ 20 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
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualinstantaneous maximum≤ .099 mg/Lall year002
Chlorine, free availablemonthly average≤ .2 mg/Lall year002
Chlorine, free availabledaily maximum≤ .5 mg/Lall year002
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Chlorine, total residualinstantaneous maximum≤ .099 mg/Lall year003
Chlorine, free availablemonthly average≤ .2 mg/Lall year003
Chlorine, free availabledaily maximum≤ .5 mg/Lall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year201
Solids, total suspendeddaily maximum≤ 100 mg/Lall year201
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year201
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
Solids, total suspendedmonthly average≤ 30 mg/Lall year202
Solids, total suspendeddaily maximum≤ 100 mg/Lall year202
Oil and grease, hexane extr methodmonthly average≤ 15 mg/Lall year202
Oil and grease, hexane extr methoddaily maximum≤ 20 mg/Lall year202
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year202
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year202
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
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX2
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX2
LC50 Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX2
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX2
LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (pass=0;fail=1)all yearTX2
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX2
%Mortality Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (%)all yearTX2
% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48-hour minimumreport only (%)all yearTX2
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX3
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX3
LC50 Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX3
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX3
LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (pass=0;fail=1)all yearTX3
LC50 Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX3
%Mortality Static Renewal 48Hr Acute Daphnia Pulex48-hour minimumreport only (%)all yearTX3
% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48-hour minimumreport only (%)all yearTX3

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/OK0000094 · MCP: https://passage-data.com/mcp