ASTM
ASTM E1527-21 Explained: The U.S. Phase 1 ESA Standard
ASTM E1527-21 is the prevailing standard for Phase I Environmental Site Assessments in U.S. commercial real estate. It defines required records review, site reconnaissance, interviews, and how environmental professionals classify Recognized Environmental Conditions (RECs).
Core Components of ASTM E1527-21
- Records review (historical sources, regulatory databases, aerial photographs)
- Site reconnaissance (visual inspection of property and adjoining areas)
- Interviews with owners, occupants, and local stakeholders
- Environmental professional evaluation and REC conclusions
- Report deliverable with findings and recommendations
User Responsibilities
The standard assigns “User” responsibilities—often the buyer or lender—to disclose known environmental liens, specialized knowledge, and common-environment issues. Missing User inputs can create data gaps.
FAQ
What is ASTM E1527-21?
It is the ASTM standard practice for Phase I Environmental Site Assessments, updated from the 2013 edition with clarified definitions and emerging contaminant considerations.
Do all Phase 1 ESAs follow ASTM E1527?
Lender-grade Phase 1 ESAs in the U.S. typically do. Always confirm the proposal cites the current ASTM edition your lender expects.
What is a REC under ASTM E1527?
A Recognized Environmental Condition indicates the presence or likely presence of hazardous substances or petroleum products due to release—see our REC vs HREC vs CREC guide for subclasses.