CASPER, Wyo. (AP) — Environmental regulators are close to removing two sites in the western U.S. from a list of polluted places in need of long-term cleanup.

The U.S. Environmental Protection Agency announced Tuesday that all required cleanup work is done at the Superfund sites in Wyoming and Utah.

Wastewater, oils and solvents contaminated soil and groundwater at a site near Casper, Wyoming. The EPA says Kinder Morgan and Dow Chemical Company/Dowell Schlumberger, Inc., helped clean up the pollution from their facilities.

The EPA says cleanup also is done at an oil refinery site in Bountiful, Utah. Brick manufacturing, asphalt production, waste oil refining, petroleum trucking and oil blending contaminated the Intermountain Waste Oil Refinery site.

The EPA says it is finalizing removal of the two sites from its Superfund list.