Phase I Environmental Site Assessment (ESA)

Identify Recognized Environmental Conditions (REC)

in 2–4 weeks with the industry gold-standard ASTM E1527-21

ASTM Compliant • CERCLA Liability Protection • Lender Approved

What Is a Phase I ESA?

ESA - Environmental Site Assessment



A study conducted to identify potential environmental contamination liabilities

associated with a property, typically before a real estate transaction. It involves

researching the property's current and historical uses, inspecting the site, and

reviewing regulatory records to assess any environmental risks.

A Phase I ESA is the essential first step in environmental due diligence. It is a non-intrusive investigation that identifies potential Recognized Environmental Conditions (RECs)

on a property — without any soil sampling or drilling. Conducted to ASTM E1527-21 standards, it helps buyers, sellers, and lenders qualify for federal liability protection under CERCLA (Superfund law).

The 4-Step Phase I Process

Records Review

(Historical aerial photos, fire insurance maps, city directories, regulatory databases)

Site Reconnaissance

 (On-site visual inspection by certified professionals)

Interviews

(With owners,

occupants, neighbors

& local officials)

Detailed Report

 (Findings, RECs, conclusions & clear recommendations) 

Why Phase I Matters

CERCLA liability protection

Cost-effective

(Might avoid Phase II)

Fast turnaround

Typically 2–4 weeks

Phase I vs Phase II

Learn about Phase II ESA