Westlake Vinyls Company, LP

NPDES permit LA0000281 · Major NON-POTW · effective, expires 2029-07-31 · 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 22 forms filed late

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

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 (166)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMO AVG <= 898 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 2382 lb/d all year
001pHMINIMUM report only all year
001pHMAXIMUM report only all year
001Solids, total suspendedMO AVG <= 3146 lb/d all year
001Solids, total suspendedDAILY MX <= 8514 lb/d all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]DAILY MX report only all year
001Copper, total [as Cu]MO AVG <= 42.41 lb/d all year
001Copper, total [as Cu]DAILY MX <= 100.59 lb/d all year
001Lead, total [as Pb]MO AVG <= 7.22 lb/d all year
001Lead, total [as Pb]DAILY MX <= 17.76 lb/d all year
001Nickel, total [as Ni]MO AVG <= 11.14 lb/d all year
001Nickel, total [as Ni]DAILY MX <= 29.2 lb/d 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 #148HR MIN report only all year
001Whole effluent toxicity - retest #148HR 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
001Whole effluent toxicity - retest #248HR MIN report only all year
001Whole effluent toxicity - retest #248HR MIN report only all year
001Carbon tetrachlorideMO AVG <= .34 lb/d all year
001Carbon tetrachlorideDAILY MX <= .72 lb/d all year
0011,2-DichloroethaneMO AVG <= 1.3 lb/d all year
0011,2-DichloroethaneDAILY MX <= 4.02 lb/d all year
001ChloroformMO AVG <= .4 lb/d all year
001ChloroformDAILY MX <= .88 lb/d all year
001TolueneMO AVG <= .5 lb/d all year
001TolueneDAILY MX <= 1.53 lb/d all year
001BenzeneMO AVG <= .71 lb/d all year
001BenzeneDAILY MX <= 2.59 lb/d all year
001AcenaphthyleneMO AVG <= .42 lb/d all year
001AcenaphthyleneDAILY MX <= 1.13 lb/d all year
001AcenaphtheneMO AVG <= .42 lb/d all year
001AcenaphtheneDAILY MX <= 1.13 lb/d all year
001AcrylonitrileMO AVG <= 1.83 lb/d all year
001AcrylonitrileDAILY MX <= 4.62 lb/d all year
001AnthraceneMO AVG <= .42 lb/d all year
001AnthraceneDAILY MX <= 1.13 lb/d all year
001Benzo[b]fluorantheneMO AVG <= .44 lb/d all year
001Benzo[b]fluorantheneDAILY MX <= 1.16 lb/d all year
001Benzo[k]fluorantheneMO AVG <= .42 lb/d all year
001Benzo[k]fluorantheneDAILY MX <= 1.13 lb/d all year
001Benzo[a]pyreneMO AVG <= .44 lb/d all year
001Benzo[a]pyreneDAILY MX <= 1.16 lb/d all year
001ChlorobenzeneMO AVG <= .29 lb/d all year
001ChlorobenzeneDAILY MX <= .53 lb/d all year
001ChryseneMO AVG <= .42 lb/d all year
001ChryseneDAILY MX <= 1.13 lb/d all year
001Diethyl phthalateMO AVG <= 1.54 lb/d all year
001Diethyl phthalateDAILY MX <= 3.87 lb/d all year
001Dimethyl phthalateMO AVG <= .36 lb/d all year
001Dimethyl phthalateDAILY MX <= .9 lb/d all year
001EthylbenzeneMO AVG <= .61 lb/d all year
001EthylbenzeneDAILY MX <= 2.06 lb/d all year
001FluorantheneMO AVG <= .48 lb/d all year
001FluorantheneDAILY MX <= 1.3 lb/d all year
001FluoreneMO AVG <= .42 lb/d all year
001FluoreneDAILY MX <= 1.13 lb/d all year
001HexachlorobutadieneMO AVG <= .38 lb/d all year
001HexachlorobutadieneDAILY MX <= .93 lb/d all year
001HexachloroethaneMO AVG <= .4 lb/d all year
001HexachloroethaneDAILY MX <= 1.03 lb/d all year
001Methyl chloride [Chloromethane]MO AVG <= 1.64 lb/d all year
001Methyl chloride [Chloromethane]DAILY MX <= 3.62 lb/d all year
001Methylene chlorideMO AVG <= .76 lb/d all year
001Methylene chlorideDAILY MX <= 1.7 lb/d all year
001NitrobenzeneMO AVG <= .51 lb/d all year
001NitrobenzeneDAILY MX <= 1.3 lb/d all year
001PhenanthreneMO AVG <= .42 lb/d all year
001PhenanthreneDAILY MX <= 1.13 lb/d all year
001PyreneMO AVG <= .16 lb/d all year
001PyreneDAILY MX <= .43 lb/d all year
001TetrachloroethyleneMO AVG <= .42 lb/d all year
001TetrachloroethyleneDAILY MX <= 1.07 lb/d all year
0011,1-DichloroethaneMO AVG <= .42 lb/d all year
0011,1-DichloroethaneDAILY MX <= 1.13 lb/d all year
0011,1-DichloroethyleneMO AVG <= .31 lb/d all year
0011,1-DichloroethyleneDAILY MX <= .48 lb/d all year
0011,1,1-TrichloroethaneMO AVG <= .4 lb/d all year
0011,1,1-TrichloroethaneDAILY MX <= 1.03 lb/d all year
0011,1,2-TrichloroethaneMO AVG <= .4 lb/d all year
0011,1,2-TrichloroethaneDAILY MX <= 1.03 lb/d all year
001Benzo[a]anthraceneMO AVG <= .42 lb/d all year
001Benzo[a]anthraceneDAILY MX <= 1.13 lb/d all year
0011,2-DichlorobenzeneMO AVG <= 1.47 lb/d all year
0011,2-DichlorobenzeneDAILY MX <= 3.11 lb/d all year
0011,2-DichloropropaneMO AVG <= 2.92 lb/d all year
0011,2-DichloropropaneDAILY MX <= 4.39 lb/d all year
001trans-1,2-DichloroethyleneMO AVG <= .14 lb/d all year
001trans-1,2-DichloroethyleneDAILY MX <= .35 lb/d all year
0011,2,4-TrichlorobenzeneMO AVG <= .44 lb/d all year
0011,2,4-TrichlorobenzeneDAILY MX <= .9 lb/d all year
0011,3-DichlorobenzeneMO AVG <= .59 lb/d all year
0011,3-DichlorobenzeneDAILY MX <= .84 lb/d all year
0011,4-DichlorobenzeneMO AVG <= .29 lb/d all year
0011,4-DichlorobenzeneDAILY MX <= .53 lb/d all year
0012-ChlorophenolMO AVG <= .59 lb/d all year
0012-ChlorophenolDAILY MX <= 1.87 lb/d all year
0012-NitrophenolMO AVG <= .78 lb/d all year
0012-NitrophenolDAILY MX <= 1.32 lb/d all year
0012,4-DichlorophenolMO AVG <= .74 lb/d all year
0012,4-DichlorophenolDAILY MX <= 2.14 lb/d all year
0012,4-DimethylphenolMO AVG <= .34 lb/d all year
0012,4-DimethylphenolDAILY MX <= .69 lb/d all year
0012,4-DinitrotolueneMO AVG <= 2.16 lb/d all year
0012,4-DinitrotolueneDAILY MX <= 5.44 lb/d all year
0012,4-DinitrophenolMO AVG <= 1.35 lb/d all year
0012,4-DinitrophenolDAILY MX <= 2.35 lb/d all year
0012,6-DinitrotolueneMO AVG <= 4.86 lb/d all year
0012,6-DinitrotolueneDAILY MX <= 12.23 lb/d all year
0014-NitrophenolMO AVG <= 1.37 lb/d all year
0014-NitrophenolDAILY MX <= 2.37 lb/d all year
0014,6-Dinitro-o-cresolMO AVG <= 1.49 lb/d all year
0014,6-Dinitro-o-cresolDAILY MX <= 5.28 lb/d all year
001PhenolMO AVG <= .29 lb/d all year
001PhenolDAILY MX <= .5 lb/d all year
001NaphthaleneMO AVG <= .42 lb/d all year
001NaphthaleneDAILY MX <= 1.13 lb/d all year
001Di[2-ethylhexyl] phthalate [DEHP]MO AVG <= 1.96 lb/d all year
001Di[2-ethylhexyl] phthalate [DEHP]DAILY MX <= 5.32 lb/d all year
001Di-n-butyl phthalateMO AVG <= .51 lb/d all year
001Di-n-butyl phthalateDAILY MX <= 1.09 lb/d all year
001Vinyl chlorideMO AVG <= 1.98 lb/d all year
001Vinyl chlorideDAILY MX <= 5.11 lb/d all year
001TrichloroethyleneMO AVG <= .4 lb/d all year
001TrichloroethyleneDAILY MX <= 1.03 lb/d all year
001HexachlorobenzeneMO AVG <= .25 lb/d all year
001HexachlorobenzeneDAILY MX <= .53 lb/d 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 residualMO AVG <= 23.8 lb/d all year
001Chlorine, total residualDAILY MX <= 39.1 lb/d all year
0011,3-DichloropropyleneMO AVG <= .55 lb/d all year
0011,3-DichloropropyleneDAILY MX <= .84 lb/d 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 - Retest #348HR MIN report only all year
001Whole Effluent Toxicity - Retest #348HR MIN report only all year
001pH range excursions, > 60 minutesMO TOTAL <= 0 occur/mo all year
001pH range excursions, monthly total accumMO TOTAL <= 446 min all year
001ChloroethaneMO AVG <= 1.98 lb/d all year
001ChloroethaneDAILY MX <= 5.11 lb/d all year
001Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexMO AV MN report only all year
001Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48HR MIN report only all year
001LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasMO AV MN report only all year
001LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48HR MIN report only all year
001NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexMO AV MN report only all year
001NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48HR MIN report only all year
001NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasMO AV MN report only all year
001NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48HR MIN report only all year
001Coef Of Var Static Renewal 48Hr Acute D. pulexMAXIMUM report only all year
001Coef Of Var Static Renewal 48Hr Acute Pimephales promelasMAXIMUM report only all year
002pHINST MIN >= 6 SU all year
002pHINST MAX <= 9 SU all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Carbon, tot organic [TOC]DAILY MX <= 50 mg/L all year
002Copper, total [as Cu]MO AVG report only all year
002Copper, total [as Cu]DAILY MX report only all year
002Lead, total [as Pb]MO AVG report only all year
002Lead, total [as Pb]DAILY MX report only all year
002Nickel, total [as Ni]MO AVG report only all year
002Nickel, total [as Ni]DAILY MX 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

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