Top 10 Phase I ESA’s

Phase I ESA FAQs

A Phase I Environmental Site Assessment (ESA) is a standardized environmental due diligence report used to identify potential or existing environmental contamination on a property. It evaluates historical land use, regulatory records, site conditions, and interviews to determine whether Recognized Environmental Conditions (RECs) are present. Phase I ESAs follow the ASTM E1527-21 standard and are commonly required for commercial real estate transactions and lender financing.

Lenders require a Phase I ESA to reduce environmental liability and comply with federal lending guidelines. The assessment helps determine whether contamination could impact property value or create cleanup obligations. A properly completed Phase I ESA also helps buyers and lenders qualify for liability protections under CERCLA (Comprehensive Environmental Response, Compensation, and Liability Act).
A Phase I ESA is typically required when:
  • Purchasing or refinancing commercial property
  • Applying for SBA or bank financing
  • Conducting real estate due diligence
  • Redeveloping or repurposing land
  • Protecting against environmental liability
Most lenders require the report to be current and compliant with ASTM E1527-21.
A standard Phase I ESA usually takes 10–15 business days to complete. Turnaround time depends on property size, complexity, historical research needs, and site access. Expedited Phase I ESAs can often be completed in 3–5 business days if needed.
The cost of a Phase I ESA can vary based on the factors below:
  • Property size and location
  • Historical land use
  • Number of buildings or parcels
  • Report turnaround time
More complex sites, such as former gas stations or industrial properties, may cost more.
A Phase I ESA generally includes:
  • Historical records review (aerial photos, fire insurance maps, deeds)
  • Regulatory database review
  • Site inspection by an environmental professional
  • Interviews with owners or occupants
  • Identification of Recognized Environmental Conditions (RECs)
  • A final written report meeting ASTM standards
A Recognized Environmental Condition (REC) refers to the presence or likely presence of hazardous substances or petroleum products due to a past release, current release, or potential future release. If a REC is identified, further investigation—usually a Phase II ESA—may be recommended.

If a Phase I ESA identifies a REC, the next step is often a Phase II Environmental Site Assessment, which involves soil, groundwater, or vapor sampling. The results help determine the extent of contamination, cleanup requirements, and whether a property transaction should proceed or be renegotiated.

A Phase I ESA is considered valid for 180 days under ASTM standards. Certain components can be updated for up to one year, but most lenders require a fully current report at the time of closing.
A Phase I ESA identifies potential environmental concerns using records and visual inspection only.A Phase II ESA confirms whether contamination exists by collecting and analyzing soil, groundwater, or vapor samples.Phase I identifies risk.Phase II confirms contamination.