SOUTHWESTERN ELECTRIC POWER COMPANY

NPDES permit TX0087726 · Major NON-POTW · effective, expires 2027-03-04 · 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 112 forms filed late

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

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among TX permits in EPA's filings — check your permit).

Limits in force (104)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. fahrenheitDAILY AV report only all year
002Temperature, water deg. fahrenheitDAILY MX <= 122 deg F all year
002Flow, in conduit or thru treatment plantDAILY AV <= 600 MGD all year
002Flow, in conduit or thru treatment plantDAILY MX <= 600 MGD all year
002Chlorine, total residualDAILY MX <= .2 mg/L all year
002Chlorine, total residualDAILY MX <= 75.6 lb/d all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedDAILY MX <= 50 mg/L all year
003Oil & GreaseDAILY MX <= 20 mg/L all year
003Selenium, total [as Se]DAILY MX <= .033 mg/L all year
003Flow, in conduit or thru treatment plantDAILY AV report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
005pHMINIMUM >= 6 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspendedDAILY MX <= 50 mg/L all year
005Oil & GreaseDAILY MX <= 20 mg/L all year
005Flow, in conduit or thru treatment plantDAILY AV report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
007pHMINIMUM >= 6 SU all year
007pHMAXIMUM <= 9 SU all year
007Solids, total suspendedDAILY AV <= 30 mg/L all year
007Solids, total suspendedDAILY MX <= 50 mg/L all year
007Oil & GreaseDAILY AV <= 15 mg/L all year
007Oil & GreaseDAILY MX <= 20 mg/L all year
007Selenium, total [as Se]DAILY MX <= .036 mg/L all year
007Flow, in conduit or thru treatment plantDAILY AV report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
008pHMINIMUM >= 6 SU all year
008pHMAXIMUM <= 9 SU all year
008Solids, total suspendedDAILY AV <= 30 mg/L all year
008Solids, total suspendedDAILY MX <= 100 mg/L all year
008Oil & GreaseDAILY AV <= 15 mg/L all year
008Oil & GreaseDAILY MX <= 20 mg/L all year
008Flow, in conduit or thru treatment plantDAILY AV report only all year
008Flow, in conduit or thru treatment plantDAILY MX report only all year
102pHMINIMUM >= 6 SU all year
102pHMAXIMUM <= 9 SU all year
102Solids, total suspendedDAILY AV <= 30 mg/L all year
102Solids, total suspendedDAILY MX <= 100 mg/L all year
102Oil & GreaseDAILY AV <= 15 mg/L all year
102Oil & GreaseDAILY MX <= 20 mg/L all year
102Selenium, total [as Se]DAILY AV <= .012 mg/L all year
102Selenium, total [as Se]DAILY MX <= .025 mg/L all year
102Flow, in conduit or thru treatment plantDAILY AV report only all year
102Flow, in conduit or thru treatment plantDAILY MX report only all year
302BOD, 5-day, 20 deg. CDAILY AV <= 20 mg/L all year
302BOD, 5-day, 20 deg. CDAILY MX <= 65 mg/L all year
302BOD, 5-day, 20 deg. CDAILY AV <= 2.5 lb/d all year
302pHMINIMUM >= 6 SU all year
302pHMAXIMUM <= 9 SU all year
302Solids, total suspendedDAILY AV <= 20 mg/L all year
302Solids, total suspendedDAILY MX <= 65 mg/L all year
302Solids, total suspendedDAILY AV <= 2.5 lb/d all year
302Flow, in conduit or thru treatment plantDAILY AV <= .015 MGD all year
302Flow, in conduit or thru treatment plantDAILY MX <= .03 MGD all year
302Chlorine, total residualMINIMUM >= 1 mg/L all year
302Chlorine, total residualDAILY MX report only all year
302E. coliDAILY AV <= 126 CFU/100mL all year
302E. coliDAILY MX <= 399 CFU/100mL all year
402pHMINIMUM >= 6 SU all year
402pHMAXIMUM <= 9 SU all year
402Solids, total suspendedDAILY AV <= 30 mg/L all year
402Solids, total suspendedDAILY MX <= 100 mg/L all year
402Oil & GreaseDAILY AV <= 15 mg/L all year
402Oil & GreaseDAILY MX <= 20 mg/L all year
402Flow, in conduit or thru treatment plantDAILY AV report only all year
402Flow, in conduit or thru treatment plantDAILY MX report only all year
TX2Whole effluent toxicity - retest #17 DA MIN report only all year
TX2Whole effluent toxicity - retest #17 DA MIN report only all year
TX2Whole effluent toxicity - retest #1MO AV MN report only all year
TX2Whole effluent toxicity - retest #1MO AV MN report only all year
TX2Whole effluent toxicity - retest #27 DA MIN report only all year
TX2Whole effluent toxicity - retest #27 DA MIN report only all year
TX2Whole effluent toxicity - retest #2MO AV MN report only all year
TX2Whole effluent toxicity - retest #2MO AV MN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX2Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX2Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX2LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX2LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX2LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX2LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX2LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TXAWhole effluent toxicity - retest #1SINGSAMP report only all year
TXAWhole effluent toxicity - retest #2SINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXALC50 Pass/Fail Static 24Hr Acute Pimephales promelasSINGSAMP 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