Westlake Corp
43 facilities · 21 states · 16.6M lbs total releases
According to the EPA Toxics Release Inventory, Westlake Corp is the reported parent of 43 Form R facilities across 21 states, disclosing 16.6M lbs of toxic releases. 38 of 312 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is Louisiana (6.3M lbs). Those TRI figures remain self-reported disclosure pounds for Westlake Corp, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Westlake Corp: EPA TRI 2023 reporting year
Same facilities, both years
-10.7%
39 facilities that filed in 2022 and 2023
Whole inventory
-10.7%
3.6 million lb → 3.2 million lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Westlake Corp's total reported releases fell from 3.6 million lb in 2022 to 3.2 million lb in 2023, based on EPA TRI filings.
- Westlake Corp's land releases rose from 5 lb in 2022 to 85 lb in 2023, based on EPA TRI filings.
- Westlake Corp's water releases fell from 63.3 thousand lb in 2022 to 40.6 thousand lb in 2023, based on EPA TRI filings.
- Westlake Corp's air releases fell from 3.2 million lb in 2022 to 2.9 million lb in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Westlake Corp from filing to facility
Largest Form R sites under this parent: Westlake Longview Corp; Westlake US 2 LLC; Westlake Polymers LLC; Westlake Vinyls Inc. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc. Largest disclosed chemicals by pounds: Ethylene; Vinyl chloride; 1,2-Dichloroethane; Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Ammonia. Heaviest-reporting states in this extract: Louisiana; Texas; Kentucky. Industry labels on the parent rollup: Chemicals; Electric Utilities; Plastics and Rubber; Chemical Wholesalers. 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 Longview Corp; Westlake US 2 LLC; Westlake Polymers LLC; Westlake Vinyls Inc. Neighbor parents on the disclosure ladder: Targa Resources Corp; Ineos US I Inc. Largest disclosed chemicals by pounds: Ethylene; Vinyl chloride; 1,2-Dichloroethane; Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Ammonia. Heaviest-reporting states in this extract: Louisiana; Texas; Kentucky. Industry labels on the parent rollup: Chemicals; Electric Utilities; Plastics and Rubber; Chemical Wholesalers.
Westlake Corp ranks #100 of 4,988 slug-merged TRI parents by disclosed release pounds, mid-to-upper among parents, not a top-25 volume name. Westlake Corp spans 21 states in this extract, placing it among the broader national TRI parent footprints. Westlake Corp's disclosed pounds are spread across 43 facilities, no single site dominates the parent total in this extract.
Parent aggregation for Westlake Corp follows facility-reported names. Compare the named neighbors (Targa Resources Corp; Ineos US I Inc) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Westlake Corp sits among TRI parents
Westlake Corp sits on a disclosure ladder beside Targa Resources Corp and Ineos US I Inc. Open those parents for a different facility count, state span, and chemical mix.
Higher disclosed volume
- Targa Resources Corp · rank #98 · 105.5M lbs
- Ineos US I Inc · rank #99 · 94.2M lbs
Largest chemicals disclosed by Westlake Corp
Ethylene; Vinyl chloride; 1,2-Dichloroethane; Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Ammonia lead the Form R pound rollup for this parent, including filings such as Westlake Longview Corp. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Ethylene | 7.3M lbs |
| Vinyl chloride | 834.7K lbs |
| 1,2-Dichloroethane | 825.5K lbs |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 751.1K lbs |
| Ammonia | 682.8K lbs |
Where does this company operate?
| State | Facilities | Total Releases |
|---|---|---|
| Louisiana | 5 | 6.3M lbs |
| Texas | 3 | 6.0M lbs |
| Kentucky | 2 | 3.0M lbs |
| West Virginia | 1 | 309.3K lbs |
| Illinois | 1 | 226.7K lbs |
| Florida | 3 | 222.3K lbs |
| North Carolina | 2 | 210.3K lbs |
| Mississippi | 4 | 142.3K lbs |
| Washington | 2 | 49.1K lbs |
| California | 6 | 24.1K lbs |
| Ohio | 4 | 13.3K lbs |
| Arizona | 1 | 4.9K lbs |
| Nevada | 1 | 3.5K lbs |
| Pennsylvania | 1 | 2.9K lbs |
| South Carolina | 1 | 1.2K lbs |
| Virginia | 1 | 927 lbs |
| Michigan | 1 | 272 lbs |
| Colorado | 1 | 4 lbs |
| Kansas | 1 | 0 lbs |
| Massachusetts | 1 | 0 lbs |
| Tennessee | 1 | 0 lbs |
Facilities (43)
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 Corp on total disclosed release pounds (16.6M lbs) and reporting facility count (43). Release-volume peers include Quikrete Holdings, Sdw Holdings Corp, Alcoa Corp. Facility-count peers include 3M Co, Basf Corp, Eaton Corp. 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.
Similar facility count
Nearest parents by reporting-site count (deduped against the release-pound neighborhood).
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are Louisiana, Texas, Kentucky; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Westlake Corp's TRI parent record
From Westlake Corp, open Westlake Longview Corp or compare against Targa Resources Corp rather than reading rank alone.
- Open the largest Form R site for Westlake Corp (Westlake Longview Corp in TX). Largest facility
- Compare against Ineos US I Inc, the next-higher disclosed-volume parent. Higher-volume parent
- Browse the full parent release ranking to see where Westlake Corp sits among all slug-merged TRI parents. All parent companies
Rank and peers (Targa Resources Corp, Ineos US I Inc) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Westlake 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.