SOUTHWESTERN ELECTRIC POWER COMPANY

NPDES permit TX0063215 · Major NON-POTW · effective, expires 2028-09-21 · 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
7required values missing, on 3 form(s)
3of 62 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 26 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (120)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Solids, total suspendedDAILY MX <= 11883 lb/d all year
001Oil & GreaseDAILY MX <= 20 mg/L all year
001Oil & GreaseDAILY MX <= 2201 lb/d all year
001Selenium, total [as Se]DAILY AV <= .015 mg/L all year
001Selenium, total [as Se]DAILY MX <= .032 mg/L all year
001Selenium, total [as Se]DAILY AV <= 2.5 lb/d all year
001Selenium, total [as Se]DAILY MX <= 5.3 lb/d all year
001Flow, in conduit or thru treatment plantDAILY AV <= 20 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= 60 MGD all year
003Temperature, water deg. fahrenheitDAILY AV report only all year
003Temperature, water deg. fahrenheitDAILY MX report only all year
003Flow, in conduit or thru treatment plantDAILY AV <= 1425 MGD all year
003Flow, in conduit or thru treatment plantDAILY MX <= 1425 MGD all year
003Chlorine, total residualDAILY MX <= .2 mg/L all year
003Chlorine, total residualDAILY MX <= 169 lb/d all year
003Chlorine, free availableDAILY AV <= .2 mg/L all year
003Chlorine, free availableDAILY MX <= .5 mg/L all year
003Chlorine, free availableDAILY AV <= 169 lb/d all year
003Chlorine, free availableDAILY MX <= 423 lb/d all year
101Solids, total suspendedDAILY AV <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Oil & GreaseDAILY AV <= 15 mg/L all year
101Oil & GreaseDAILY MX <= 20 mg/L all year
101Copper, total [as Cu]DAILY AV <= .5 mg/L all year
101Copper, total [as Cu]DAILY MX <= 1 mg/L all year
101Iron, total [as Fe]DAILY AV <= 1 mg/L all year
101Iron, total [as Fe]DAILY MX <= 1 mg/L all year
101Flow, in conduit or thru treatment plantDAILY AV report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
103BOD, 5-day, 20 deg. CDAILY AV <= 20 mg/L all year
103BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
103BOD, 5-day, 20 deg. CDAILY AV <= 2.67 lb/d all year
103BOD, 5-day, 20 deg. CDAILY MX <= 6 lb/d all year
103pHMINIMUM >= 6 SU all year
103pHMAXIMUM <= 9 SU all year
103Solids, total suspendedDAILY AV <= 20 mg/L all year
103Solids, total suspendedDAILY MX <= 45 mg/L all year
103Solids, total suspendedDAILY AV <= 2.67 lb/d all year
103Solids, total suspendedDAILY MX <= 6 lb/d all year
103Flow, in conduit or thru treatment plantDAILY AV <= .016 MGD all year
103Flow, in conduit or thru treatment plantDAILY MX <= .02 MGD all year
103Chlorine, total residualMO MIN >= 1 mg/L all year
103Chlorine, total residualMO MAX <= 4 mg/L all year
103E. coliDAILY AV <= 126 CFU/100mL all year
103E. coliDAILY MX <= 399 CFU/100mL all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #17 DA MIN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #1MO AV MN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #27 DA MIN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Whole effluent toxicity - retest #2MO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX1Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX1LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX3Whole effluent toxicity - retest #17 DA MIN report only all year
TX3Whole effluent toxicity - retest #17 DA MIN report only all year
TX3Whole effluent toxicity - retest #1MO AV MN report only all year
TX3Whole effluent toxicity - retest #1MO AV MN report only all year
TX3Whole effluent toxicity - retest #27 DA MIN report only all year
TX3Whole effluent toxicity - retest #27 DA MIN report only all year
TX3Whole effluent toxicity - retest #2MO AV MN report only all year
TX3Whole effluent toxicity - retest #2MO AV MN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX3Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7 DA MIN report only all year
TX3Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasMO AV MN report only all year
TX3LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
TX3LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
TX3LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
TX3LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
TX3LOEC 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
TXCWhole effluent toxicity - retest #1SINGSAMP report only all year
TXCWhole effluent toxicity - retest #2SINGSAMP report only all year
TXCLC50 Pass/Fail Static 24Hr Acute D. PulexSINGSAMP report only all year
TXCLC50 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