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There could be new more stringent standards to measure vapor intrusion in California—or maybe not. It seems to depend on the agency. The California EPA, which oversees several environmental agencies throughout the state, has not adopted new measurement standards are vapor intrusion, but regional agencies have. These agencies, which include regional water quality control boards, have begun employing the federal EPA guideline, and it is causing a lot of uncertainty for property owners.

“The origin is still a bit mysterious,” Preston Brooks, partner at Cox, Castle & Nicholson, tells GlobeSt.com. “There was a 2015 standard that was adopted by the US EPA, and I think that at the California EPA level, there were good reasons not to follow suit. The standard was based on East Coast conditions, and there are some significant differences between East Coast and West Coast vapor intrusion.”

Kelsi Maree Borland

Kelsi Borland is a freelance writer and editor living whose work has appeared in such publications as Travel + Leisure, Angeleno and Riviera Orange County.

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