A bipartisan group of 20 senators has called on the Environmental Protection Agency (EPA) to regulate allowable drinking water levels of two chemicals linked to various health problems.

The letter was sent Friday by Sens. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.), Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (R-W.Va.) and others, days after Politico reported that the EPA is expected to decide against setting drinking water limits for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) as part of an upcoming national strategy for dealing with the class of chemicals known as per- and polyfluoroalkyl substances (PFAS).

“If this is accurate, EPA’s inaction would be a major setback to states and affected communities,” the senators wrote to acting EPA chief Andrew Wheeler.

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“Therefore, we ask you to develop enforceable federal drinking water standards for PFOA and PFOS, as well as institute immediate actions to protect the public from contamination from additional per- and polyfluoroalkyl substances (PFAS).”

EPA did not directly deny Politico's report, but said in a statement earlier this week that officials had not published a final decision on whether to regulate the substances' levels in drinking water.

The letter comes days before the Senate Environment and Public Works Committee votes on Wheeler’s nomination to be the EPA’s official administrator. Capito and many of the Democrats who signed onto the demand sit on that committee.

PFOS and PFOA have been used to manufacturer various products like firefighting foam and non-stick materials. They could be cancerous, and have been linked to other health problems like immune system disorders and developmental delays.

Communities around the country have started to discover PFOS and PFOA in their drinking water supplies, leading to growing calls for EPA action.