Westlake Corporation is an international manufacturer and supplier of petrochemicals, polymers and fabricated building products, which are fundamental to various consumer and industrial markets.

[6] In 2014, Westlake made a significant expansion in their ethylene production facilities in Sulphur, Louisiana.

[9] In June 2021, Westlake purchased the United States building products business of Boral for $2.2 billion.

In 2024, the U.S. Environmental Protection Agency (EPA) announced findings from a long-term air monitoring study in the surrounding community, and determined emissions of ethylene dichloride were driving elevated cancer risk.

[15] Westlake's Calvert City operations are the main source of ethylene dichloride emissions in the area, according to the EPA.