Westlake Chemical Corp
2 facilities · 1 state · 2.7M lbs total releases
According to the EPA Toxics Release Inventory, Westlake Chemical Corp is the reported parent of 2 Form R facilities across 1 state, disclosing 2.7M lbs of toxic releases. 27 of 81 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is Louisiana (2.7M lbs). Those TRI figures remain self-reported disclosure pounds for Westlake Chemical Corp, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Westlake Chemical Corp: EPA TRI 2023 reporting year
Same facilities, both years
-7.5%
2 facilities that filed in 2022 and 2023
Whole inventory
-7.5%
577.7 thousand lb → 534.1 thousand lb, every facility that filed
- Westlake Chemical Corp's total reported releases fell from 577.7 thousand lb in 2022 to 534.1 thousand lb in 2023, based on EPA TRI filings.
- Westlake Chemical Corp's land releases rose from 59 lb in 2022 to 6.8 thousand lb in 2023, based on EPA TRI filings.
- Westlake Chemical Corp's off-site transfers fell from 34.5 thousand lb in 2022 to 8.9 thousand lb in 2023, based on EPA TRI filings.
- Westlake Chemical Corp's water releases fell from 209.6 thousand lb in 2022 to 84.6 thousand lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Westlake Chemical Corp from filing to facility
Largest Form R sites under this parent: Westlake Chemicals & Vinyls LLC; Westlake Petrochemicals Ethylene. Neighbor parents on the disclosure ladder: Bayer US Holding LP; Ccc Parent LLC. Largest disclosed chemicals by pounds: Nitrate compounds (water dissociable; reportable only when in aqueous solution); Ethylene; Propylene; Chlorodifluoromethane (HCFC-22); Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: Louisiana. Industry labels on the parent rollup: Chemicals. Start from those named sites and neighbors rather than a generic parent blurb; pounds stay disclosure, not risk.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files Toxics Release Inventory (TRI) · August 2026
Largest Form R sites under this parent: Westlake Chemicals & Vinyls LLC; Westlake Petrochemicals Ethylene. Neighbor parents on the disclosure ladder: Bayer US Holding LP; Ccc Parent LLC. Largest disclosed chemicals by pounds: Nitrate compounds (water dissociable; reportable only when in aqueous solution); Ethylene; Propylene; Chlorodifluoromethane (HCFC-22); Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size). Heaviest-reporting states in this extract: Louisiana. Industry labels on the parent rollup: Chemicals.
Westlake Chemical Corp ranks #386 of 4,988 slug-merged TRI parents, a smaller disclosed-volume parent relative to the national Form R parent set. Westlake Chemical Corp's TRI Form R footprint is concentrated in a single state (Louisiana), so statewide context matters more than a multi-state portfolio read. Westlake Chemical Corp's disclosed pounds are spread across 2 facilities, no single site dominates the parent total in this extract.
Parent aggregation for Westlake Chemical Corp follows facility-reported names. Compare the named neighbors (Bayer US Holding LP; Ccc Parent LLC) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Westlake Chemical Corp sits among TRI parents
Westlake Chemical Corp sits on a disclosure ladder beside Bayer US Holding LP and Ccc Parent LLC. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Bayer US Holding LP · rank #384 · 81.9M lbs
- Ccc Parent LLC · rank #385 · 65.6M lbs
Largest chemicals disclosed by Westlake Chemical Corp
Nitrate compounds (water dissociable; reportable only when in aqueous solution); Ethylene; Propylene; Chlorodifluoromethane (HCFC-22); Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) lead the Form R pound rollup for this parent, including filings such as Westlake Chemicals & Vinyls LLC. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 622.8K lbs |
| Ethylene | 519.7K lbs |
| Propylene | 251.1K lbs |
| Chlorodifluoromethane (HCFC-22) | 246.0K lbs |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 238.4K lbs |
Facilities (2)
| Facility | Releases |
|---|---|
| Westlake Chemicals & Vinyls LLC Plaquemine, LA | 1.7M lbs |
| Westlake Petrochemicals Ethylene Sulphur, LA | 1.0M lbs |
Frequently Asked Questions
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Westlake Chemical Corp on total disclosed release pounds (2.7M lbs) and reporting facility count (2). Release-volume peers include Bwx Technologies Inc, Western Midstream Partners LP, Stepan Co. Neighborhoods are forced disjoint so each axis surfaces a different set of parents.
Similar disclosed release pounds
Nearest parents (≥3 facilities, ≥10k lbs) by absolute TRI disclosed pounds, not rank-adjacent ladder neighbors.
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are Louisiana; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Westlake Chemical Corp's TRI parent record
From Westlake Chemical Corp, open Westlake Chemicals & Vinyls LLC or compare against Bayer US Holding LP rather than reading rank alone.
- Open the largest Form R site for Westlake Chemical Corp (Westlake Chemicals & Vinyls LLC in LA). Largest facility
- Compare against Ccc Parent LLC, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Westlake Chemical Corp sits among all slug-merged TRI parents. All parent companies
Rank and peers (Bayer US Holding LP, Ccc Parent LLC) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Westlake Chemical Corp's record groups disclosed TRI parent-company filings so readers can compare reporting context without treating the total as a measure of risk.
Company release figures are computed directly from EPA Toxic Release Inventory data; source names and the record-linking method are documented in the methodology.
Primary sources
- EPA Toxics Release Inventory Basic Data Files - annual facility-level chemical-release disclosures
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.