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You are here: Home » Resources » Glossary » ASTM E1527-21 Standard – Phase I Environmental Site Assessments

ASTM E1527-21 Standard – Phase I Environmental Site Assessments

The ASTM E1527-21 standard will be the fifth revision of the environmental professional industry standard governing the practice and process for conducting Phase I Environmental Site Assessments as part of compliance with the US Environmental Protection Agency’s All Appropriate Inquiries (AAI) requirement prior to a property transaction to qualify for exemption from Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) liability for cleanup costs, among other industry and client-specific uses. The current version of the standard, ASTM E1527-21, took effect on January 1, 2022. On December 12, 2022 the EPA made a final rule approving the new standard, which became effective on February 13, 2023.

Standards for environmental site assessments are published by the ASTM. Standards should be carefully reviewed to fully understand the work to be completed as well as the limitations of reports. In addition, the National Engineering and Environmental Due Diligence Association (NEEDDA) has published a white paper that can provide a useful starting point. The National Engineering and Environmental Due Diligence Association or “NEEDDA” is a 501(c)(6) non-profit organization formed to  improve the practice of engineering and environmental due diligence for all stakeholders, members, clients, vendors, and non-member firms. Read the full White Paper here.

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