What Is the CERCLIS Database?

CERCLIS, the Comprehensive Environmental Response, Compensation, and Liability Information System, is EPA's internal tracking system for sites under evaluation or action within the Superfund program, established under CERCLA. It's frequently confused with the National Priorities List, but the two aren't the same thing.

• CERCLIS versus the NPL
• The NPL is the published list of the most seriously contaminated sites, eligible for long-term federal cleanup funding. CERCLIS is broader: it tracks sites at every stage of the Superfund process, from initial screening and preliminary assessment, through investigation, and in many cases, sites that are ultimately determined not to warrant further federal action at all (historically tracked as "No Further Remedial Action Planned," or NFRAP). A CERCLIS listing is not the same as an NPL listing, and most CERCLIS sites never become NPL sites.

• Why a CERCLIS record still matters
• Even a site that was screened and later closed out with no further action documents that a concern was investigated at some point in the property's history. For due diligence purposes, that's useful evidence, distinct from, and generally far less significant than, an active NPL listing.

• Data system evolution
• EPA has been transitioning underlying Superfund tracking data into newer systems, including the Superfund Enterprise Management System (SEMS), so property records with CERCLIS history may appear under updated system names in current EPA data pulls, while still reflecting the same underlying case history.

• Reading a CERCLIS record correctly
• The status of the record (active investigation, referred for further work, or archived with no further action) matters far more than the fact that a record exists at all. A property or nearby site with an old, closed-out CERCLIS entry and no further findings is a very different situation from one with an active investigation.

Geoscope's database screening surfaces CERCLIS and related Superfund program history alongside its current status, so the distinction between "was once looked at" and "requires attention now" is clear rather than implied.