What is a Phase 1 Environmental Assessment?
A Phase 1 Environmental Site Assessment (ESA) is a due diligence investigation that evaluates the potential for environmental contamination on a property. It involves reviewing historical records, aerial photographs, government databases, and physical site inspection to identify recognized environmental conditions (RECs) — evidence of past or present contamination or conditions that could lead to contamination.
When Phase 1 is required
Phase 1 ESAs are typically required for: commercial property purchases (most lenders require them), gas stations, dry cleaners, auto repair shops, industrial sites, properties near known contamination, and any property where the buyer wants the protection of the "innocent landowner" defense under CERCLA (the federal Superfund law). Residential properties rarely require Phase 1 assessments unless there are specific environmental concerns.
What Phase 1 covers
Records review: Historical maps, aerial photos, city directories, environmental databases (CERCLIS, RCRA, state databases), fire insurance maps, and previous Phase 1 reports.
Site inspection: Visual observation of the property for signs of contamination (staining, drums, tanks, odors, stressed vegetation).
Interviews: Current and past owners, operators, and local government officials.
Report: Documents findings and identifies any RECs. Does NOT include soil or water testing (that is Phase 2).
Cost and timeline
A typical Phase 1 ESA costs $1,500-$4,000 and takes 2-4 weeks to complete. The cost depends on property size, complexity, and location. Some firms offer expedited timelines for an additional fee.
If contamination is suspected
If the Phase 1 identifies RECs, a Phase 2 ESA may be recommended. Phase 2 involves actual sampling and testing of soil, groundwater, and/or air to confirm whether contamination exists and its extent. Phase 2 costs $5,000-$50,000+ depending on the type and extent of testing required.