After 20 Years Los Alamos Lab Still Doesn’t Know Size of Plume
At Present Rate Cleanup Will Take More Than a Century

FOR IMMEDIATE RELEASE, January 2, 2025

Contact: Jay Coghlan, Nuclear Watch New Mexico, 505-989-7342, [email protected]

Santa Fe, NM – On December 30, 2024, in the middle of the holiday season, the Los Alamos National Laboratory (LANL) posted the report Independent Review of the Chromium Interim Measures Remediation System to its largely unknown Legacy Cleanup Electronic Public Reading Room. This report attempts to address the Lab’s extensive contamination of the region’s deep groundwater aquifer by a large plume of hexavalent chromium, whose potentially serious human health effects (including cancer) was the subject of the popular movie Erin Brockovich.

LANL’s chromium contamination plume is at least one mile long, a half mile wide and 100 feet thick.[1] It is commonly regarded as the Lab’s most serious environmental threat. One drinking water supply well for Los Alamos County has been shut down because of the plume. Lab maps of the contamination depict it as abruptly stopping at the border of San Ildefonso Pueblo, which is highly unlikely.

The bottom line of the newly released chromium report is:

“…at this time the plume is not sufficiently characterized to design a final remedy… data gaps and uncertainties need to be addressed before committing to an alternative or final remedy.”

This is a full two decades after the chromium plume was first reported.

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