LOS ALAMOS, N.M. —

The migration of a toxic plume of hexavalent chromium from the Los Alamos National Laboratory to groundwater under the Pueblo of San Ildefonso has addressed with a statement from the Pueblo's governor, Christopher Moquino.

"We will be taking all action necessary to ensure cleanup and accountability for this contamination," Moquino's statement reads, in part. "No level of chromium above natural background levels in our water is acceptable to the Pueblo."

The plume's origins date back more than 60 years. Hexavalent chromium, which is toxic and carcinogenic, was periodically flushed with water from Los Alamos National Laboratory cooling towers into Sandia Canyon from 1956 to 1972.

Since the plume was discovered, efforts to mitigate the contamination haven't stopped it f

See Full Page