The U.S. Environmental Protection Agency on Friday designated a pair of widely used industrial chemicals as hazardous substances under the country’s Superfund program, accelerating a crackdown on toxic compounds known as “forever chemicals.”

The rule will require companies to report leaks of two of the most commonly used per- and polyfluoroalkyl substances, or PFAS, and help pay to clean up existing contamination.

The EPA separately last week announced its first-ever drinking water standards to guard against PFAS pollution.

The new rule targets contamination from two PFAS known as PFOA and PFOS.