Phase I Environmental Site Assessment
A records-and-site-visit review of whether a property may be contaminated, done to a published standard.
An environmental professional reviews historical records, regulatory databases, aerial photos, and the site itself, and reports any “recognized environmental conditions” — signs that hazardous substances or petroleum may be present. It does not sample soil or water; that is a Phase II.
Why it matters
Under federal law a buyer can become liable for cleaning up contamination they did not cause. A Phase I done to the EPA’s All Appropriate Inquiries standard before purchase is how a buyer preserves the defenses to that liability. Lenders on commercial and agricultural land often require one. For a residential lot it is usually optional, and worth it when the land was ever farmed intensively, used for industry, or sits near a regulated facility.
Sources
Articles on this topic
- Analyzing a property with Terranown: a walkthroughSeptember 30, 2026
- What a land report should tell you — and how to judge oneJuly 28, 2026
- How to research a property yourself, step by stepMay 20, 2026
- Why you should analyze land before you buy itMarch 12, 2026
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