Over the past month, a San Antonio-based waste management company has opened two oil and natural gas waste landfills in the Permian Basin to become the largest operator of such landfills in the busy West Texas shale play.

Petro Waste Environmental LP, with the new facilities, has four landfills in the region.

“With the opening of the Deep Six and Big Lake landfills, Petro Waste is now strategically positioned to cover all four quadrants of the most active play in the United States,” Petro Waste founder and CEO George Wommack said in a statement. “We now have more landfills in operation in the Permian Basin than any other oil and gas waste disposal company.”

The company’s Deep Six Landfill is on 212 acres off U.S. Highway 285 about 10 miles south of the Reeves County town of Pecos. The facility, which is a joint venture between Petro Waste Environmental and Austin-based Trinity Environmental Services I LLC, accepts oil-based mud, water-based mud, oil-based drill cuttings, water-based drill cuttings, contaminated soil, and RCRA-exempt nonhazardous exploration and production waste.