The Senate is prepared to walk away from provisions of a defense policy bill that would compel the Environmental Protection Agency (EPA) to regulate a cancer-linked chemical that is leaching into the water supply, Sen. James Inhofe James (Jim) Mountain InhofeOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds Democrats push to limit transfer of military-grade gear to police Chamber of Commerce endorses McSally for reelection MORE (R-Okla.) told reporters Tuesday.

Both the House and Senate versions of the National Defense Authorization Act (NDAA) include provisions dealing with a class of chemicals abbreviated as PFAS. The substance is used in firefighting foam and has contaminated the water near at least 425 military sites.

But the chemical, which is widely used in a number of nonstick products, is hardly just a military problem. One study found that 99 percent of those tested had PFAS traces in their blood, and it’s been deemed a “forever chemical” due to its persistence in both the body and the environment. It’s been found in nearly every state in the country.

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Both the House and Senate versions push the EPA to set a drinking water standard for PFAS — the agency currently only has a 70 parts per trillion level they recommend municipalities meet. But the House version goes even further, requiring PFAS to be designated a hazardous substance under the Superfund law, enabling funds to clean up contamination.

But as the conference committee on the legislation drags on, it appears less likely that PFAS provisions outside the scope of the military may be included at all.

Inhofe said the broad provisions are veering outside the scope of what would typically be included in a defense policy bill — legislation that is already entangled in a fight over whether to give funding to President Trump’s border wall.

“Look we made a deal months ago that when we’re in somebody else’s jurisdiction, and they change their mind or are opposed to it, then ... we’re just going to let them go ahead and try to do it through their committees,” he said.

That would likely be a big disappointment to many on the House side.

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Rep. Dan Kildee Daniel (Dan) Timothy KildeeLawmakers fear voter backlash over failure to reach COVID-19 relief deal Democrats set to hold out for big police reform More than 100 Democrats press Trump to extend jobless benefits MORE (D-Mich.) sent a letter, alongside 68 other House members, that said they would not support the bill if it “fails to significantly address ongoing and legacy contamination from PFAS chemicals.”

“The important thing for us is to make it really clear that it's very difficult for some of us to support the NDAA anyway. It’s a tough call. But when we have these really good provisions on PFAS that’s an incentive for us to move forward and overlook what we see as some of the other weaknesses. If somehow that’s stripped out, I mean there’s no real motivation for many of us to stick with this legislation itself,” Kildee said last week.

Even if broad PFAS provisions aren’t included in the NDAA, the House Energy and Commerce Committee is already working on a larger bill to regulate the substance.

“If they’re going to choose to not include that in their defense bill then obviously here’s our chance to have the issue really stand on its own, which was my preference,” Rep. Paul Tonko Paul David TonkoOvernight Energy: Trump officials finalize plan to open up protected areas of Tongass to logging | Feds say offshore testing for oil can proceed despite drilling moratorium | Dems question EPA's postponement of inequality training Democrats question EPA postponement of environmental inequality training Clark rolls out endorsements in assistant Speaker race MORE (D-N.Y.), who is spearheading the effort, said last week.

“It’s of such significance and so important to public health and public safety, and it’s a modern day concern veiled in urgency,” he said. “I think the best way is to have it discussed and responded to in its own right.”

If the NDAA proceeded without any PFAS provision, that would likely please the EPA, which is in the process of reviewing whether to set a drinking water standard for PFAS and believes the regulation should come from the agency itself.

“We don’t support either the House or the Senate bill,” EPA Administrator Andrew Wheeler Andrew WheelerOvernight Energy: Trump officials finalize plan to open up protected areas of Tongass to logging | Feds say offshore testing for oil can proceed despite drilling moratorium | Dems question EPA's postponement of inequality training Democrats question EPA postponement of environmental inequality training OVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right MORE said at a PFAS event last month.