May 20, 2025

What is a Preliminary Site Investigation (PSI)?

A Preliminary Site Investigation (PSI) is the first step in assessing whether land is potentially contaminated. It involves a review of the site’s history, past uses, and surrounding land activity to identify any risks to human health or the environment.

A Preliminary Site Investigation (PSI) is the first step in assessing whether land is potentially contaminated. It involves a review of the site’s history, past uses, and surrounding land activity to identify any risks to human health or the environment. A PSI typically includes desktop research, site inspections, and sometimes limited sampling to determine if a more detailed investigation is needed. It’s a crucial part of the environmental due diligence process, often required before property transactions or redevelopment, ensuring that any hidden issues are flagged early - saving time, money, and future liability.

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