EmissionsLookup
Non-Compliance TRI Reporter Clean Air Act Clean Water Act RCRA

WESTLAKE PETROCHEMICAL LP

Quick Summary

  • Released 173,489 lbs of toxic chemicals to the environment in the most recent TRI reporting year.
  • Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
  • Assessed $2,250,000 in total penalties since records began.
  • Reports releases of chemicals classified as known or probable carcinogens.
Address
900 HIGHWAY 108
SULPHUR, LA 70664
View on map ↗
County
CALCASIEU County
Industry
Manufacturing
NAICS (North American Industry Classification)
325110
Inspections
8 · last May 13, 2025
Total Penalties
$2,250,000 · last Oct 26, 2022
Registry ID
110043973509

How This Compares

#71 of 419 TRI reporters in LA
#764 of 16,877 TRI reporters in Manufacturing

Ranked by most recent year's total TRI releases.

Compliance Status (Last 12 Quarters)

Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.

0
Air (CAA)
Qtrs Non-Compliant
6
Water (CWA)
Qtrs Non-Compliant
0
Hazardous Waste (RCRA)
Qtrs Non-Compliant

TRI Toxic Chemical Releases

Annual pounds of each toxic chemical released to air, water, and land, as reported to the EPA Toxic Release Inventory. Carcinogen (♦) and PFAS designations are per EPA and IARC classifications.

Emissions Trend (2015–2024) +61% overall
Year Total Releases (lbs) vs Prior Year
2015 106,804
2016 140,708 +32%
2017 173,489 +23%
2018 136,872 -21%
2019 101,660 -26%
2020 137,888 +36%
2021 59,117 -57%
2022 50,858 -14%
2023 48,535 -5%
2024 172,242 +255%

2024

Chemical Total (lbs) Air Water Land Off-Site
Ethylene glycol
Bromine
Chlorine dioxide
S,S,S-Tributyltrithiophosphate
Ethylene 68,679 68,679
Benzene 67,654 67,604 49 83,199 ♦ Carcinogen
Ammonia 11,318 11,318 556
1,3-Butadiene 10,270 10,270 ♦ Carcinogen
Styrene 8,576 8,576 698 ♦ Carcinogen
n-Hexane 3,009 3,009
Propylene 1,211 1,211
Maleic anhydride 503 503
Naphthalene 454 433 21 8,156 ♦ Carcinogen
Xylene (mixed isomers) 274 77 197 55
Ethylbenzene 188 188 ♦ Carcinogen
1,2,4-Trimethylbenzene 46 46 743
Chlorine 20 20
Biphenyl 18 18
Cumene 10 10 ♦ Carcinogen
Toluene 8 8
Dinitrobutyl phenol 6 6
Methyl tert-butyl ether 0 0

2023

Chemical Total (lbs) Air Water Land Off-Site
Ethylene glycol
S,S,S-Tributyltrithiophosphate
Bromine
1,2,4-Trimethylbenzene
Chlorine dioxide
Ammonia 13,919 13,919 248
Benzene 10,597 10,054 543 50,729 ♦ Carcinogen
1,3-Butadiene 8,183 8,183 ♦ Carcinogen
Ethylbenzene 5,311 5,120 191 939 ♦ Carcinogen
Ethylene 3,995 3,995
Toluene 3,610 3,518 92 6,430
Styrene 982 982 2,448 ♦ Carcinogen
Propylene 959 959
Maleic anhydride 471 471
Methyl tert-butyl ether 232 232
Naphthalene 223 217 7 5,463 ♦ Carcinogen
Chlorine 20 20
Cumene 11 11 ♦ Carcinogen
Dinitrobutyl phenol 7 7
Biphenyl 7 7
n-Hexane 5 5 25
Xylene (mixed isomers) 4 4

2022

Chemical Total (lbs) Air Water Land Off-Site
Chlorine dioxide
Bromine
S,S,S-Tributyltrithiophosphate
Ethylene glycol
Ethylene 23,221 23,221
Ammonia 10,561 10,561
1,3-Butadiene 8,995 8,995 ♦ Carcinogen
Ethylbenzene 4,718 4,704 14 233 ♦ Carcinogen
Toluene 913 902 12 168
Styrene 857 857 407 ♦ Carcinogen
Xylene (mixed isomers) 775 694 81 679
Maleic anhydride 471 471
Propylene 245 245
1,2,4-Trimethylbenzene 46 46 8
Benzene 23 23 ♦ Carcinogen
Methyl tert-butyl ether 11 11
Cumene 8 8 ♦ Carcinogen
Dinitrobutyl phenol 6 6
n-Hexane 3 3
Biphenyl 3 3
Naphthalene 1 1 ♦ Carcinogen
Chlorine 1 1

2021

Chemical Total (lbs) Air Water Land Off-Site
1,2,4-Trimethylbenzene
S,S,S-Tributyltrithiophosphate
Bromine
Ethylene glycol
Chlorine dioxide
Propylene
Ethylene 24,821 24,821
1,3-Butadiene 9,149 9,149 ♦ Carcinogen
Benzene 7,913 7,908 5 35,945 ♦ Carcinogen
Ethylbenzene 7,559 7,546 13 2 ♦ Carcinogen
Styrene 6,493 6,493 172 ♦ Carcinogen
Ammonia 1,245 1,245
Toluene 930 921 9 10
Maleic anhydride 470 470
Methyl tert-butyl ether 270 270
Naphthalene 196 195 1 15,492 ♦ Carcinogen
Cumene 36 36 ♦ Carcinogen
Chlorine 20 20
n-Hexane 5 5
Dinitrobutyl phenol 5 5
Biphenyl 3 3
Xylene (mixed isomers) 2 2

2020

Chemical Total (lbs) Air Water Land Off-Site
Bromine
Ethylene glycol
S,S,S-Tributyltrithiophosphate
Chlorine dioxide
Ethylene 58,401 58,401
Propylene 51,431 51,431
Ammonia 8,157 8,157 178
1,3-Butadiene 7,904 7,904 ♦ Carcinogen
Styrene 6,670 6,670 2,003 ♦ Carcinogen
Benzene 1,887 1,887 65 ♦ Carcinogen
Ethylbenzene 801 800 1 743 ♦ Carcinogen
Toluene 768 768 13
Xylene (mixed isomers) 652 652 794
Maleic anhydride 490 490
Methyl tert-butyl ether 270 270
Naphthalene 172 159 13 116,039 ♦ Carcinogen
n-Hexane 170 170
1,2,4-Trimethylbenzene 50 50
Cumene 36 36 ♦ Carcinogen
Chlorine 21 21
Dinitrobutyl phenol 6 6
Biphenyl 2 2

2019

Chemical Total (lbs) Air Water Land Off-Site
S,S,S-Tributyltrithiophosphate
Chlorine dioxide
1,2,4-Trimethylbenzene
Naphthalene ♦ Carcinogen
Xylene (mixed isomers)
Bromine
Ethylene glycol
Ethylene 68,451 68,451
1,3-Butadiene 9,232 9,232 ♦ Carcinogen
Ammonia 8,360 8,360 1,339
Styrene 7,090 7,090 394 ♦ Carcinogen
Ethylbenzene 6,714 6,714 4 ♦ Carcinogen
Toluene 767 767 2,259
Maleic anhydride 471 471
Propylene 240 240
Methyl tert-butyl ether 234 234
Cumene 36 36 ♦ Carcinogen
Dinitrobutyl phenol 26 26
Chlorine 20 20
Biphenyl 10 10
n-Hexane 5 5
Benzene 4 4 ♦ Carcinogen

2018

Chemical Total (lbs) Air Water Land Off-Site
Chlorine dioxide
S,S,S-Tributyltrithiophosphate
Aluminum oxide (fibrous forms)
Bromine
Propylene 66,385 66,385
Ethylene 39,734 39,734
1,3-Butadiene 11,343 11,343 ♦ Carcinogen
Toluene 5,001 5,001
Ethylbenzene 4,909 4,909 443 ♦ Carcinogen
Ammonia 1,945 1,945
Benzene 1,917 1,917 3,690 ♦ Carcinogen
n-Hexane 1,802 1,802
Xylene (mixed isomers) 1,717 1,717
Styrene 1,120 1,119 1 ♦ Carcinogen
Maleic anhydride 487 487
Naphthalene 258 183 75 ♦ Carcinogen
Methyl tert-butyl ether 159 159
1,2,4-Trimethylbenzene 46 46
Chlorine 20 20
Biphenyl 10 10
Cumene 10 10 ♦ Carcinogen
Dinitrobutyl phenol 9 9

2017

Chemical Total (lbs) Air Water Land Off-Site
Chlorine dioxide
Naphthalene ♦ Carcinogen
1,2,4-Trimethylbenzene
S,S,S-Tributyltrithiophosphate
Bromine
Ethylene 80,438 80,438
Propylene 60,600 60,600
1,3-Butadiene 9,419 9,419 ♦ Carcinogen
Styrene 6,410 6,410 ♦ Carcinogen
Ethylbenzene 5,370 5,370 ♦ Carcinogen
Ammonia 4,122 4,122
Toluene 3,891 3,890 1
Benzene 1,523 1,523 ♦ Carcinogen
Xylene (mixed isomers) 1,321 1,321
Cumene 147 147 ♦ Carcinogen
Methyl tert-butyl ether 141 141
Maleic anhydride 70 70
Chlorine 20 20
Dinitrobutyl phenol 9 9
Biphenyl 8 8

2016

Chemical Total (lbs) Air Water Land Off-Site
S,S,S-Tributyltrithiophosphate
Chlorine dioxide
Bromine
Ethylene 75,849 75,849
Propylene 31,222 31,222
Ammonia 16,942 16,942
1,3-Butadiene 5,046 5,046 2,847 ♦ Carcinogen
Ethylbenzene 4,564 4,563 1 ♦ Carcinogen
Toluene 2,854 2,853 1 5,615
Benzene 2,173 2,168 5 ♦ Carcinogen
Styrene 923 919 4 4,485 ♦ Carcinogen
Xylene (mixed isomers) 621 621 1,102
Methyl tert-butyl ether 188 188
Cumene 160 160 ♦ Carcinogen
Naphthalene 91 71 20 ♦ Carcinogen
Chlorine 40 40
Biphenyl 13 13
Maleic anhydride 10 10
Dinitrobutyl phenol 10 10
1,2,4-Trimethylbenzene 2 2

2015

Chemical Total (lbs) Air Water Land Off-Site
S,S,S-Tributyltrithiophosphate
Chlorine dioxide
Xylene (mixed isomers)
Bromine
Ethylene 35,786 35,786
Propylene 32,674 32,674
Benzene 12,040 12,030 10 493,974 ♦ Carcinogen
Ammonia 8,303 8,303
1,3-Butadiene 8,269 8,269 56,511 ♦ Carcinogen
Ethylbenzene 7,368 7,368 2,173 ♦ Carcinogen
Styrene 1,152 1,151 1 90,404 ♦ Carcinogen
Toluene 843 843 844
Methyl tert-butyl ether 166 166
Cumene 102 102 ♦ Carcinogen
Chlorine 40 40
Dinitrobutyl phenol 33 33
Naphthalene 16 1 15 ♦ Carcinogen
Maleic anhydride 10 10
1,2,4-Trimethylbenzene 1 1
Biphenyl 1 1

Waste Management & Recycling

How this facility manages toxic chemicals beyond direct releases — through recycling, energy recovery, and on-site or off-site treatment. Data from the most recent TRI reporting year. Quantities in pounds.

Chemical Released Recycled Energy Recovery Treated
Ammonia 556
1,3-Butadiene 196,387 923,510
Ethylene 10,489,950 1,665,070
Toluene 254
Naphthalene 10 43
Ethylbenzene 987 24,380
Propylene 989,515 535,061
Styrene 186,807 23,776
Benzene 697

Off-Site Transfer Destinations

Facilities to which toxic chemicals were transferred for disposal, recycling, energy recovery, or treatment during the most recent TRI reporting year. Quantities in pounds.

Destination Chemical Disposal Recycling Energy Rec. Treatment
CLEAN HARBORS EL DORADO, LLC
EL DORADO, AR
Ammonia 15
CLEAN HARBORS DEER PARK
DEER PARK, TX
Ammonia 541
CLEAN HARBORS DEER PARK
DEER PARK, TX
1,2,4-Trimethylbenzene 742
CLEAN HARBORS LAPORTE
LA PORTE, TX
1,2,4-Trimethylbenzene 0
VEOLIA ES TECHNICAL SOLUTIONS
BEAUMONT, TX
Xylene (mixed isomers) 3
WESTERN WASTE OF TEXAS LLC - NEWTON COUNTY REGIONAL SOLID WA
DEWEYVILLE, TX
Xylene (mixed isomers) 0
CLEAN HARBORS EL DORADO, LLC
EL DORADO, AR
Ethylbenzene 5
CLEAN HARBORS ENVIRONMENTAL SERVICES INC
DEER PARK, TX
Ethylbenzene 651
VEOLIA ES TECHNICAL SOLUTIONS
BEAUMONT, TX
Ethylbenzene 3
VEOLIA ES TECHNICAL SOLUTIONS
BEAUMONT, TX
Toluene 6
CLEAN HARBORS DEER PARK
DEER PARK, TX
Styrene 3,684
CLEAN HARBORS LAPORTE
LA PORTE, TX
Styrene 4
CLEAN HARBORS DEER PARK
DEER PARK, TX
Toluene 9,396
CLEAN HARBORS EL DORADO, LLC
EL DORADO, AR
Toluene 77
CLEAN HARBORS LAPORTE
LA PORTE, TX
Toluene 7
CLEAN HARBORS DEER PARK
DEER PARK, TX
Xylene (mixed isomers) 823
CLEAN HARBORS LAPORTE
LA PORTE, TX
Xylene (mixed isomers) 2
CLEAN HARBORS DEER PARK
DEER PARK, TX
Benzene 83,171
CLEAN HARBORS EL DORADO, LLC
EL DORADO, AR
Benzene 15
CLEAN HARBORS LAPORTE
LA PORTE, TX
Benzene 13
CLEAN HARBORS DEER PARK
DEER PARK, TX
Naphthalene 8,155
CLEAN HARBORS LAPORTE
LA PORTE, TX
Naphthalene 1

Compliance Violations

Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.

Program Type Violation Date Return to Compliance Status
caa Linked to Viol. Below Open
caa Open
caa Open
cwa Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements Nov 2, 2016 Jul 20, 2017 Resolved
cwa Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements Feb 25, 2016 Jul 20, 2017 Resolved
cwa Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements Mar 31, 2013 Apr 4, 2017 Resolved
cwa Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements Feb 28, 2010 Apr 4, 2017 Resolved
cwa Management Practice Violations - Improper Operation and Maintenance Jan 25, 2010 Feb 24, 2017 Resolved
cwa Monitoring Violations - Improper Analysis or Lab Error Dec 23, 2008 Feb 24, 2017 Resolved
cwa Monitoring Violations - Invalid/Unrepresentative Sample Jan 31, 2008 Feb 24, 2017 Resolved
cwa WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMP Oct 25, 2007 Feb 24, 2017 Resolved
cwa Monitoring Violations - Invalid/Unrepresentative Sample Sep 19, 2007 Feb 24, 2017 Resolved
cwa Reporting Violations - Improper/ Incorrect Reporting Sep 19, 2007 Feb 24, 2017 Resolved
cwa Management Practice Violations - Failure to Implement SPCC Plan Sep 19, 2007 Feb 24, 2017 Resolved
cwa Monitoring Violations - Invalid/Unrepresentative Sample Jan 31, 2007 Feb 24, 2017 Resolved
cwa WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMP Nov 14, 2006 Feb 24, 2017 Resolved
cwa Effluent Violations - Unauthorized Discharge Nov 14, 2006 Feb 24, 2017 Resolved
cwa Effluent Violations - Unauthorized Discharge Oct 2, 2006 Feb 24, 2017 Resolved
cwa Monitoring Violations - Analysis not Conducted Mar 31, 2006 Feb 24, 2017 Resolved
cwa Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements May 31, 2005 Feb 24, 2017 Resolved
cwa Monitoring Violations - Improper Analysis or Lab Error Oct 31, 2004 Feb 24, 2017 Resolved
cwa Effluent Violations - Unauthorized Discharge Feb 19, 2004 Feb 24, 2017 Resolved
cwa Monitoring Violations - Analysis not Conducted Jun 23, 2003 Feb 24, 2017 Resolved
cwa Monitoring Violations - Improper Analysis or Lab Error Dec 16, 2002 Feb 24, 2017 Resolved
cwa Permit Violations - Violation Specified in Comment Dec 17, 2001 Nov 13, 2003 Resolved
cwa Monitoring Violations - Invalid/Unrepresentative Sample Dec 17, 2001 Nov 13, 2003 Resolved
cwa Permit Violations - Discharge Without a Valid Permit Jul 21, 2001 Nov 13, 2003 Resolved
cwa Permit Violations - Violation Specified in Comment Jun 18, 2001 Nov 13, 2003 Resolved
rcra Standards Applicable to Generators of HW: General Sep 19, 2000 Oct 31, 2003 Resolved
rcra Standards Applicable to Recordkeeping and Reporting Applicable to Small and Large Quantity Generators Sep 19, 2000 Oct 31, 2003 Resolved
rcra Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators Sep 19, 2000 Oct 31, 2003 Resolved
cwa Permit Violations - Violation Specified in Comment Jul 31, 2000 Oct 31, 2003 Resolved
cwa Permit Violations - Violation Specified in Comment Feb 9, 2000 Nov 13, 2003 Resolved
rcra Standards Applicable to Generators of HW: General Jul 20, 1999 Sep 30, 2000 Resolved
cwa Reporting Violations - Improper/ Incorrect Reporting Jul 20, 1998 May 17, 1999 Resolved
cwa Permit Violations - Violation Specified in Comment Jul 20, 1998 May 17, 1999 Resolved
cwa Monitoring Violations - Analysis not Conducted Jul 20, 1998 May 17, 1999 Resolved
cwa Monitoring Violations - Invalid/Unrepresentative Sample Jul 20, 1998 May 17, 1999 Resolved
cwa Permit Violations - Discharge Without a Valid Permit Jul 20, 1998 May 17, 1999 Resolved
rcra Standards Applicable to Generators of HW: General Jul 20, 1998 Sep 30, 2000 Resolved
cwa Permit Violations - Violation Specified in Comment Mar 17, 1998 May 17, 1999 Resolved
cwa Management Practice Violations - Improper Operation and Maintenance Nov 21, 1997 Open
rcra Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators Apr 24, 1995 Aug 9, 1997 Resolved
rcra Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators Mar 24, 1995 Aug 9, 1997 Resolved
cwa Permit Violations - Violation Specified in Comment Jun 14, 1994 Open
rcra Standards Applicable to Generators of HW: General Mar 3, 1993 Oct 25, 1993 Resolved
cwa Schedule Event achieved late but reported Dec 1, 1992 Open
cwa Schedule Event achieved late but reported Sep 22, 1992 Open
cwa Schedule Event achieved late but reported Apr 30, 1992 Open
rcra Standards Applicable to Generators of HW: General Apr 22, 1992 Aug 5, 1992 Resolved

Discharge Limit Exceedances

Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.

Pollutant Violation Reported Limit Exceedance Period Status
Enterococci DMR, Limited - Numeric Violation 24,100.00 MPN/100mL 135.00 +99,999% Dec 2025 Open
Enterococci DMR, Limited - Numeric Violation 24,150.00 MPN/100mL 35.00 +99,999% Dec 2025 Open
Solids, total suspended DMR, Limited - Numeric Violation 1,386.52 kg/d 1,192.20 +16% Apr 2025 Open
Solids, total suspended DMR, Limited - Numeric Violation 388.17 kg/d 368.65 +5% Apr 2025 Open
BOD, 5-day, 20 deg. C DMR, Limited - Numeric Violation 315.48 kg/d 602.00 +99,999% Jan 2024 Open
Benzene DMR, Limited - Numeric Violation 1.00 kg/d 0.77 +29% Oct 2023 Open
Ethylbenzene DMR, Limited - Numeric Violation 1.67 kg/d 0.99 +70% Aug 2023 Open
Benzene DMR, Limited - Numeric Violation 4.32 kg/d 0.77 +459% Aug 2023 Open
Ethylbenzene DMR, Limited - Numeric Violation 1.67 kg/d 0.33 +404% Aug 2023 Open
Benzene DMR, Limited - Numeric Violation 1.48 kg/d 0.24 +525% Aug 2023 Open
Coliform, fecal general DMR, Limited - Numeric Violation 2,000.00 MPN/100mL 400.00 +99,999% Jun 2022 Open
Coliform, fecal general DMR, Limited - Numeric Violation 1,005.00 MPN/100mL 200.00 +402% Jun 2022 Open
Solids, total suspended DMR, Limited - Numeric Violation 405.42 kg/d 329.15 +23% Sep 2021 Open
Chloroform DMR, Limited - Numeric Violation 0.32 kg/d 0.22 +48% Jun 2016 Open
Chloroform DMR, Limited - Numeric Violation 0.87 kg/d 0.59 +47% Jun 2016 Open

Enforcement Actions

Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.

Judicial
· Case HQ-2015-0006 · Oct 26, 2022
$750,000
Administrative - Formal
· Case 06-2019-3343 · Aug 20, 2019
Administrative - Formal
Clean Air Act · Case 3601146160 · Aug 16, 2017
$36,215
Administrative - Formal
· Case 06-2017-3362 · Aug 16, 2017
$36,215
Administrative - Formal
Clean Air Act · Case 3601146564 · Aug 11, 2017
$0
Administrative - Formal
· Case 06-2017-3363 · Aug 11, 2017
State Administrative Order of Consent
Clean Water Act · Case LA-SAWE150044 · Feb 24, 2017
$23,978
Administrative - Formal
· Case 06-2014-3511 · Mar 6, 2014
$8,000
Judicial
· Case 06-2008-3402 · Apr 26, 2013
$500,000
State CWA Non Penalty AO
Clean Water Act · Case LA-WECN080153 · Apr 26, 2010
State CWA Non Penalty AO
Clean Water Act · Case LA-WECN060426 · Apr 26, 2010
State Administrative Order of Consent
Clean Water Act · Case LA-N00006562 · Oct 31, 2003
$815,000
FINAL SETTLEMENT
RCRA (Hazardous Waste) · Case RCRA-LAD985184761-STL · Oct 31, 2003
State CWA Non Penalty AO
Clean Water Act · Case LA-N00004564 · Oct 17, 2002
Administrative - Formal
· Case 06-2000-1245 · Oct 9, 2000
$2,000
Administrative - Formal
· Case 06-1999-0120 · Jun 19, 2000
$76,458
FINAL 3008(A) COMPLIANCE ORDER
RCRA (Hazardous Waste) · Case RCRA-LAD985184761-000 · Apr 22, 1999
$16,590
State CWA Penalty AO
Clean Water Act · Case LA-N00002088 · Apr 19, 1999
$22,854
State CWA Non Penalty AO
Clean Water Act · Case LA-N00001969 · Feb 4, 1999
Administrative - Formal
· Case 06-1998-0244 · Feb 10, 1998

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