Public Service CO-Southwestern

NPDES permit OK0000094 · Major NON-POTW · effective, expires 2026-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 70 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among OK permits in EPA's filings — check your permit).

Limits in force (58)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 100 mg/L all year
001Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualINST MAX <= .099 mg/L all year
002Chlorine, free availableMO AVG <= .2 mg/L all year
002Chlorine, free availableDAILY MX <= .5 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residualINST MAX <= .099 mg/L all year
003Chlorine, free availableMO AVG <= .2 mg/L all year
003Chlorine, free availableDAILY MX <= .5 mg/L all year
201Solids, total suspendedMO AVG <= 30 mg/L all year
201Solids, total suspendedDAILY MX <= 100 mg/L all year
201Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
201Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
201Flow, in conduit or thru treatment plantMO AVG report only all year
201Flow, in conduit or thru treatment plantDAILY MX report only all year
202Solids, total suspendedMO AVG <= 30 mg/L all year
202Solids, total suspendedDAILY MX <= 100 mg/L all year
202Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
202Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
202Flow, in conduit or thru treatment plantMO AVG report only all year
202Flow, in conduit or thru treatment plantDAILY MX report only all year
TX1Whole effluent toxicity - retest #148HR MIN report only all year
TX1Whole effluent toxicity - retest #248HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX1LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX1%Mortality Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX1% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48HR MIN report only all year
TX2Whole effluent toxicity - retest #148HR MIN report only all year
TX2Whole effluent toxicity - retest #248HR MIN report only all year
TX2LC50 Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX2LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX2LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX2LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX2%Mortality Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX2% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48HR MIN report only all year
TX3Whole effluent toxicity - retest #148HR MIN report only all year
TX3Whole effluent toxicity - retest #248HR MIN report only all year
TX3LC50 Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
TX3LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX3LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX3LC50 Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
TX3%Mortality Static Renewal 48Hr Acute Daphnia Pulex48HR MIN report only all year
TX3% Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C48HR MIN report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states