After unexpected controversy earlier in the year, on December 15, 2022 the U.S. Environmental Protection Agency (EPA) issued a Final Rule unambiguously recognizing the ASTM International Standard E1527-21 for Phase I Environmental Site Assessments (ESAs), with an effective date of February 13, 2023.[1] EPA’s express endorsement of the standard as meeting the requirements of the All Appropriate Inquiry (AAI) Rule[2] is essential to ensuring that the Phase I ESA fulfills its fundamental purpose: protection for prospective purchasers (and lessees) of property from liability for pre-existing contamination by petroleum products or hazardous substances regulated under the Comprehensive Environmental Response and Cleanup Liability Act (CERCLA).[3]
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