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Westlake Polymers LLC- Westlake Petrochemicial Complex

Industrial Organic Chemicals, major discharger, Lake Charles, Louisiana. NPDES permit LA0082511, in force until May 31, 2027. Last 12 months: over a limit 2 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (28 values), outfall 001 form ME quarterly (9 values), outfall 001 form MY quarterly (9 values), outfall 001 form Q quarterly (6 values), outfall 006 form Q quarterly (6 values), outfall 101 form Q quarterly (6 values), and 5 more forms
Renewal application due
Dec 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 51 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimit
December 2025Enterococci, daily maximum> 24100 #/100mL≤ 135 #/100mL
December 2025Enterococci, monthly geometric mean> 24150 #/100mL≤ 35 #/100mL

Limits in force (252)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 525 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 1395 lb/dall year001
pHminimumreport only (SU)all year001
pHmaximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 812 lb/dall year001
Solids, total suspendeddaily maximum≤ 2626 lb/dall year001
Oil & Greasemonthly average≤ 316 lb/dall year001
Oil & Greasedaily maximum≤ 474 lb/dall year001
Carbon tetrachloridemonthly average≤ .6 lb/dall year001
Carbon tetrachloridemonthly average≤ .61 lb/dall year001
Carbon tetrachloridedaily maximum≤ 1.5 lb/dall year001
Carbon tetrachloridedaily maximum≤ 1.54 lb/dall year001
1,2-Dichloroethanemonthly average≤ 1.19 lb/dall year001
1,2-Dichloroethanemonthly average≤ 1.25 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 3.73 lb/dall year001
1,2-Dichloroethanedaily maximum≤ 3.92 lb/dall year001
Chloroformmonthly average≤ .55 lb/dall year001
Chloroformdaily maximum≤ 1.45 lb/dall year001
Toluenemonthly average≤ .36 lb/dall year001
Toluenedaily maximum≤ 1.03 lb/dall year001
Benzenemonthly average≤ .56 lb/dall year001
Benzenedaily maximum≤ 1.82 lb/dall year001
Acenaphthylenemonthly average≤ .27 lb/dall year001
Acenaphthylenemonthly average≤ .29 lb/dall year001
Acenaphthylenedaily maximum≤ .7 lb/dall year001
Acenaphthylenedaily maximum≤ .76 lb/dall year001
Acenaphthenemonthly average≤ .29 lb/dall year001
Acenaphthenedaily maximum≤ .76 lb/dall year001
Acrylonitrilemonthly average≤ 1.2 lb/dall year001
Acrylonitrilemonthly average≤ 1.28 lb/dall year001
Acrylonitriledaily maximum≤ 3 lb/dall year001
Acrylonitriledaily maximum≤ 3.22 lb/dall year001
Anthracenemonthly average≤ .27 lb/dall year001
Anthracenemonthly average≤ .29 lb/dall year001
Anthracenedaily maximum≤ .7 lb/dall year001
Anthracenedaily maximum≤ .76 lb/dall year001
Benzo[b]fluoranthenemonthly average≤ .28 lb/dall year001
Benzo[b]fluoranthenemonthly average≤ .3 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .73 lb/dall year001
Benzo[b]fluoranthenedaily maximum≤ .78 lb/dall year001
Benzo[k]fluoranthenemonthly average≤ .27 lb/dall year001
Benzo[k]fluoranthenemonthly average≤ .29 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .7 lb/dall year001
Benzo[k]fluoranthenedaily maximum≤ .76 lb/dall year001
Benzo[a]pyrenemonthly average≤ .1147 lb/dall year001
Chlorobenzenemonthly average≤ .57 lb/dall year001
Chlorobenzenemonthly average≤ .58 lb/dall year001
Chlorobenzenedaily maximum≤ 1.41 lb/dall year001
Chlorobenzenedaily maximum≤ 1.43 lb/dall year001
Chrysenemonthly average≤ .27 lb/dall year001
Chrysenemonthly average≤ .29 lb/dall year001
Chrysenedaily maximum≤ .7 lb/dall year001
Chrysenedaily maximum≤ .76 lb/dall year001
Diethyl phthalatemonthly average≤ .91 lb/dall year001
Diethyl phthalatemonthly average≤ .98 lb/dall year001
Diethyl phthalatedaily maximum≤ 2.28 lb/dall year001
Diethyl phthalatedaily maximum≤ 2.46 lb/dall year001
Dimethyl phthalatemonthly average≤ .24 lb/dall year001
Dimethyl phthalatemonthly average≤ .26 lb/dall year001
Dimethyl phthalatedaily maximum≤ .59 lb/dall year001
Dimethyl phthalatedaily maximum≤ .63 lb/dall year001
Ethylbenzenemonthly average≤ .76 lb/dall year001
Ethylbenzenedaily maximum≤ 2.27 lb/dall year001
Fluoranthenemonthly average≤ .3 lb/dall year001
Fluoranthenemonthly average≤ .33 lb/dall year001
Fluoranthenedaily maximum≤ .81 lb/dall year001
Fluoranthenedaily maximum≤ .87 lb/dall year001
Fluorenemonthly average≤ .29 lb/dall year001
Fluorenedaily maximum≤ .76 lb/dall year001
Hexachlorobutadienemonthly average≤ .368 lb/dall year001
Hexachlorobutadienedaily maximum≤ .873 lb/dall year001
Hexachloroethanemonthly average≤ .79 lb/dall year001
Hexachloroethanemonthly average≤ .82 lb/dall year001
Hexachloroethanedaily maximum≤ 2.9 lb/dall year001
Hexachloroethanedaily maximum≤ 2.94 lb/dall year001
Methyl chloride [Chloromethane]monthly average≤ 1.15 lb/dall year001
Methyl chloride [Chloromethane]monthly average≤ 1.23 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 2.7 lb/dall year001
Methyl chloride [Chloromethane]daily maximum≤ 2.87 lb/dall year001
Methylene chloridemonthly average≤ .49 lb/dall year001
Methylene chloridemonthly average≤ .53 lb/dall year001
Methylene chloridedaily maximum≤ 1.36 lb/dall year001
Methylene chloridedaily maximum≤ 1.44 lb/dall year001
Nitrobenzenemonthly average≤ 6.96 lb/dall year001
Nitrobenzenemonthly average≤ 6.99 lb/dall year001
Nitrobenzenedaily maximum≤ 19.84 lb/dall year001
Nitrobenzenedaily maximum≤ 19.9 lb/dall year001
Phenanthrenemonthly average≤ .29 lb/dall year001
Phenanthrenedaily maximum≤ .76 lb/dall year001
Pyrenemonthly average≤ .3 lb/dall year001
Pyrenemonthly average≤ .32 lb/dall year001
Pyrenedaily maximum≤ .78 lb/dall year001
Pyrenedaily maximum≤ .84 lb/dall year001
Tetrachloroethylenemonthly average≤ .37 lb/dall year001
Tetrachloroethylenemonthly average≤ .39 lb/dall year001
Tetrachloroethylenedaily maximum≤ 1.03 lb/dall year001
Tetrachloroethylenedaily maximum≤ 1.08 lb/dall year001
1,1-Dichloroethanemonthly average≤ .28 lb/dall year001
1,1-Dichloroethanemonthly average≤ .3 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .74 lb/dall year001
1,1-Dichloroethanedaily maximum≤ .79 lb/dall year001
1,1-Dichloroethylenemonthly average≤ .22 lb/dall year001
1,1-Dichloroethylenemonthly average≤ .23 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .42 lb/dall year001
1,1-Dichloroethylenedaily maximum≤ .44 lb/dall year001
1,1,1-Trichloroethanemonthly average≤ .27 lb/dall year001
1,1,1-Trichloroethanemonthly average≤ .29 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .69 lb/dall year001
1,1,1-Trichloroethanedaily maximum≤ .74 lb/dall year001
1,1,2-Trichloroethanemonthly average≤ .3 lb/dall year001
1,1,2-Trichloroethanemonthly average≤ .32 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .9 lb/dall year001
1,1,2-Trichloroethanedaily maximum≤ .94 lb/dall year001
Benzo[a]anthracenemonthly average≤ .1147 lb/dall year001
1,2-Dichlorobenzenemonthly average≤ 1.32 lb/dall year001
1,2-Dichlorobenzenemonthly average≤ 1.39 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 3.94 lb/dall year001
1,2-Dichlorobenzenedaily maximum≤ 4.08 lb/dall year001
1,2-Dichloropropanemonthly average≤ 2.05 lb/dall year001
1,2-Dichloropropanemonthly average≤ 2.19 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 4.57 lb/dall year001
1,2-Dichloropropanedaily maximum≤ 4.78 lb/dall year001
trans-1,2-Dichloroethylenemonthly average≤ .28 lb/dall year001
trans-1,2-Dichloroethylenemonthly average≤ .29 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .71 lb/dall year001
trans-1,2-Dichloroethylenedaily maximum≤ .76 lb/dall year001
1,2,4-Trichlorobenzenemonthly average≤ 1.24 lb/dall year001
1,2,4-Trichlorobenzenemonthly average≤ 1.3 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 3.72 lb/dall year001
1,2,4-Trichlorobenzenedaily maximum≤ 3.84 lb/dall year001
1,3-Dichlorobenzenemonthly average≤ .72 lb/dall year001
1,3-Dichlorobenzenemonthly average≤ .75 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ 1.56 lb/dall year001
1,3-Dichlorobenzenedaily maximum≤ 1.6 lb/dall year001
1,4-Dichlorobenzenemonthly average≤ .57 lb/dall year001
1,4-Dichlorobenzenemonthly average≤ .58 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ 1.41 lb/dall year001
1,4-Dichlorobenzenedaily maximum≤ 1.43 lb/dall year001
2-Chlorophenolmonthly average≤ .3 lb/dall year001
2-Chlorophenolmonthly average≤ .32 lb/dall year001
2-Chlorophenoldaily maximum≤ .94 lb/dall year001
2-Chlorophenoldaily maximum≤ 1.02 lb/dall year001
2-Nitrophenolmonthly average≤ .59 lb/dall year001
2-Nitrophenolmonthly average≤ .62 lb/dall year001
2-Nitrophenoldaily maximum≤ 1.35 lb/dall year001
2-Nitrophenoldaily maximum≤ 1.41 lb/dall year001
2,4-Dichlorophenolmonthly average≤ .37 lb/dall year001
2,4-Dichlorophenolmonthly average≤ .41 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ 1.07 lb/dall year001
2,4-Dichlorophenoldaily maximum≤ 1.17 lb/dall year001
2,4-Dimethylphenolmonthly average≤ .23 lb/dall year001
2,4-Dimethylphenolmonthly average≤ .24 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .48 lb/dall year001
2,4-Dimethylphenoldaily maximum≤ .52 lb/dall year001
2,4-Dinitrotoluenemonthly average≤ 1.08 lb/dall year001
2,4-Dinitrotoluenemonthly average≤ 1.18 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ 2.72 lb/dall year001
2,4-Dinitrotoluenedaily maximum≤ 2.98 lb/dall year001
2,4-Dinitrophenolmonthly average≤ 4.3 lb/dall year001
2,4-Dinitrophenolmonthly average≤ 4.36 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 14.04 lb/dall year001
2,4-Dinitrophenoldaily maximum≤ 14.15 lb/dall year001
2,6-Dinitrotoluenemonthly average≤ 2.43 lb/dall year001
2,6-Dinitrotoluenemonthly average≤ 2.66 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ 6.12 lb/dall year001
2,6-Dinitrotoluenedaily maximum≤ 6.69 lb/dall year001
4-Nitrophenolmonthly average≤ 1.17 lb/dall year001
4-Nitrophenolmonthly average≤ 1.24 lb/dall year001
4-Nitrophenoldaily maximum≤ 2.91 lb/dall year001
4-Nitrophenoldaily maximum≤ 3.02 lb/dall year001
4,6-Dinitro-o-cresolmonthly average≤ .98 lb/dall year001
4,6-Dinitro-o-cresolmonthly average≤ 1.05 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 3.47 lb/dall year001
4,6-Dinitro-o-cresoldaily maximum≤ 3.72 lb/dall year001
Phenolmonthly average≤ .21 lb/dall year001
Phenoldaily maximum≤ .41 lb/dall year001
Naphthalenemonthly average≤ .29 lb/dall year001
Naphthalenedaily maximum≤ .76 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ 1.27 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ 1.36 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 3.44 lb/dall year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ 3.69 lb/dall year001
Di-n-butyl phthalatemonthly average≤ .32 lb/dall year001
Di-n-butyl phthalatemonthly average≤ .34 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .67 lb/dall year001
Di-n-butyl phthalatedaily maximum≤ .72 lb/dall year001
Vinyl chloridemonthly average≤ 1.28 lb/dall year001
Vinyl chloridemonthly average≤ 1.38 lb/dall year001
Vinyl chloridedaily maximum≤ 3.07 lb/dall year001
Vinyl chloridedaily maximum≤ 3.31 lb/dall year001
Trichloroethylenemonthly average≤ .28 lb/dall year001
Trichloroethylenemonthly average≤ .3 lb/dall year001
Trichloroethylenedaily maximum≤ .72 lb/dall year001
Trichloroethylenedaily maximum≤ .77 lb/dall year001
Hexachlorobenzenemonthly average≤ .012 lb/dall year001
Hexachlorobenzenedaily maximum≤ .028 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
1,3-Dichloropropylenemonthly average≤ .86 lb/dall year001
1,3-Dichloropropylenemonthly average≤ .89 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ 2.8 lb/dall year001
1,3-Dichloropropylenedaily maximum≤ 2.84 lb/dall year001
pH range excursions, > 60 minutesmonthly total≤ 0 occur/moall year001
pH range excursions, monthly total accummonthly total≤ 446 minall year001
Chloroethanemonthly average≤ 1.32 lb/dall year001
Chloroethanemonthly average≤ 1.42 lb/dall year001
Chloroethanedaily maximum≤ 3.44 lb/dall year001
Chloroethanedaily maximum≤ 3.68 lb/dall year001
Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all year001
Pass/Fail Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)7-day minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia)monthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (pass=0;fail=1)all year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (pass=0;fail=1)all year001
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all year001
NOEC Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)7-day minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllinamonthly average minimumreport only (%)all year001
NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia beryllina7-day minimumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia)maximumreport only (%)all year001
Coef Of Var Static Renewal 7Day Chronic Menidia beryllinamaximumreport only (%)all year001
pHinstantaneous minimum≥ 6 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
Oil & Greasedaily maximum≤ 15 mg/Lall year006
Carbon, tot organic [TOC]daily maximum≤ 50 mg/Lall year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Enterococcimonthly geometric mean≤ 35 #/100mLall year101
Enterococcidaily maximum≤ 135 #/100mLall year101
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year101
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year401
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year401
Enterococcimonthly geometric mean≤ 35 #/100mLall year401
Enterococcidaily maximum≤ 135 #/100mLall year401
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year401
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year401
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year501
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year501
Enterococcimonthly geometric mean≤ 35 #/100mLall year501
Enterococcidaily maximum≤ 135 #/100mLall year501
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year501
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year501
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearIT01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearIT01

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 130 Chemicals and Allied Products permits in Louisiana.

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