ASTM
REC vs HREC vs CREC: Phase 1 ESA Finding Types Explained
Phase 1 ESA reports classify environmental risk using ASTM-defined terms. Understanding REC, HREC, and CREC helps buyers interpret findings and decide whether Phase 2 testing or price adjustments are needed.
Recognized Environmental Condition (REC)
A REC indicates known or likely release of hazardous substances or petroleum products in connection with the property—most likely to trigger further investigation.
Historical REC (HREC)
An HREC describes past release that has been addressed to unrestricted residential use standards (or the applicable standard)—but history still matters for disclosure and lender comfort.
Controlled REC (CREC)
A CREC is a REC that allows remaining contamination managed with institutional or engineering controls—common at redeveloped industrial sites.
FAQ
Does every REC require Phase 2?
Not automatically—but lenders and buyers often require Phase 2 when a REC suggests unresolved subsurface impact.
Is an HREC a deal killer?
Usually less severe than an active REC if closure documentation is solid—but legal and lender counsel should review reliance letters.
Who determines REC vs HREC vs CREC?
The environmental professional signing the Phase 1 ESA, based on ASTM definitions and available records.