Southwestern Electric Power Company - Arsenal Hill Power Plant

NPDES permit LA0002925 · Major NON-POTW · administratively continued, expires 2026-01-31 · 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.

This permit expired on 2026-01-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 109 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among LA permits in EPA's filings — check your permit).

Limits in force (117)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitINST MAX <= 90 deg F all year
001Copper, total [as Cu]MO AVG <= 18 ug/L all year
001Copper, total [as Cu]DAILY MX <= 43 ug/L all year
001Whole effluent toxicity - retest #17 DA MIN report only all year
001Whole effluent toxicity - retest #17 DA MIN report only all year
001Whole effluent toxicity - retest #1MO AV MN report only all year
001Whole effluent toxicity - retest #1MO AV MN report only all year
001Whole effluent toxicity - retest #27 DA MIN report only all year
001Whole effluent toxicity - retest #27 DA MIN report only all year
001Whole effluent toxicity - retest #2MO AV MN report only all year
001Whole effluent toxicity - retest #2MO AV MN report only all year
001WET, sublethal retest #17 DA MIN report only all year
001WET, sublethal retest #17 DA MIN report only all year
001WET, sublethal retest #1MO AV MN report only all year
001WET, sublethal retest #1MO AV MN report only all year
001WET, sublethal retest #27 DA MIN report only all year
001WET, sublethal retest #27 DA MIN report only all year
001WET, sublethal retest #2MO AV MN report only all year
001WET, sublethal retest #2MO AV MN report only all year
001Phenolics, total recoverableMO AVG <= 7 ug/L all year
001Phenolics, total recoverableDAILY MX <= 16 ug/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
001Chlorine, total residualDAILY MX <= .2 mg/L all year
001Whole Effluent Toxicity - Retest #37 DA MIN report only all year
001Whole Effluent Toxicity - Retest #37 DA MIN report only all year
001Whole Effluent Toxicity - Retest #3MO AV MN report only all year
001Whole Effluent Toxicity - Retest #3MO AV MN report only all year
001Whole Effluent Toxicity, Sub-Lethal Retest #37 DA MIN report only all year
001Whole Effluent Toxicity, Sub-Lethal Retest #37 DA MIN report only all year
001Whole Effluent Toxicity, Sub-Lethal Retest #3MO AV MN report only all year
001Whole Effluent Toxicity, Sub-Lethal Retest #3MO AV MN report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7 DA MIN report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasMO AV MN report only all year
001Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
001Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
001Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
001Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
001NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7 DA MIN report only all year
001NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AV MN report only all year
001NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7 DA MIN report only all year
001NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AV MN report only all year
001Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubiaMAXIMUM report only all year
001Coef Of Var Static Renewal 7Day Chronic Pimephales promelasMAXIMUM report only all year
002Temperature, water deg. fahrenheitMO AVG report only all year
002Temperature, water deg. fahrenheitDAILY MX <= 114 deg F all year
002Color [PT-CO units]MO AVG report only all year
002Color [PT-CO units]DAILY MX report only all year
002pHINST MIN >= 6 SU all year
002pHINST MAX <= 9 SU all year
002Chromium, total [as Cr]MO AVG <= .2 mg/L all year
002Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
002Chromium, total [as Cr]MO AVG <= 2.64 lb/d all year
002Chromium, total [as Cr]DAILY MX <= 2.64 lb/d all year
002Zinc, total [as Zn]MO AVG <= 1 mg/L all year
002Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
002Zinc, total [as Zn]MO AVG <= 13.2 lb/d all year
002Zinc, total [as Zn]DAILY MX <= 13.2 lb/d all year
002Whole effluent toxicity - retest #148HR MIN report only all year
002Whole effluent toxicity - retest #148HR MIN report only all year
002Whole effluent toxicity - retest #1MO AV MN report only all year
002Whole effluent toxicity - retest #1MO AV MN report only all year
002Whole effluent toxicity - retest #248HR MIN report only all year
002Whole effluent toxicity - retest #248HR MIN report only all year
002Whole effluent toxicity - retest #2MO AV MN report only all year
002Whole effluent toxicity - retest #2MO AV MN report only 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, free availableMO AVG <= .2 mg/L all year
002Chlorine, free availableDAILY MX <= .5 mg/L all year
002Chlorine, free availableMO AVG <= 2.64 lb/d all year
002Chlorine, free availableDAILY MX <= 6.59 lb/d all year
002Whole Effluent Toxicity - Retest #348HR MIN report only all year
002Whole Effluent Toxicity - Retest #348HR MIN report only all year
002Whole Effluent Toxicity - Retest #3MO AV MN report only all year
002Whole Effluent Toxicity - Retest #3MO AV MN report only all year
002Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
002Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexMO AV MN report only all year
002LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
002LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasMO AV MN report only all year
002NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48HR MIN report only all year
002NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexMO AV MN report only all year
002NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48HR MIN report only all year
002NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasMO AV MN report only all year
002Coef Of Var Static Renewal 48Hr Acute D. pulexMAXIMUM report only all year
002Coef Of Var Static Renewal 48Hr Acute Pimephales promelasMAXIMUM report only all year
101pHINST MIN >= 6 SU all year
101pHINST MAX <= 9 SU all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 100 mg/L all year
101Oil & GreaseMO AVG <= 15 mg/L all year
101Oil & GreaseDAILY MX <= 20 mg/L all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
102pHINST MIN >= 6 SU all year
102pHINST MAX <= 9 SU all year
102Solids, total suspendedMO AVG <= 30 mg/L all year
102Solids, total suspendedDAILY MX <= 100 mg/L all year
102Oil & GreaseMO AVG <= 15 mg/L all year
102Oil & GreaseDAILY MX <= 20 mg/L all year
102Flow, in conduit or thru treatment plantMO AVG report only all year
102Flow, in conduit or thru treatment plantDAILY MX report only 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
202Chlorine, total residualDAILY MX <= .2 mg/L all year
EQTFlow, in conduit or thru treatment plantMO AVG report only all year
EQTFlow, in conduit or thru treatment plantMO AVG report only all year
EQTFlow, in conduit or thru treatment plantDAILY MX report only all year
EQTFlow, in conduit or thru treatment plantDAILY MX 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