Moses Lake Wellfield Superfund Site

The site includes at least one plume of trichloroethylene (TCE) contaminated groundwater within an area at least a mile wide, up to three miles long, and from 100 to 310 feet deep, underlying and extending south from the former Larson Air Force Base. 

The U.S. Air Force used the base from 1942 until the mid 1960s, when it was decommissioned and sold. Currently, the Port of Moses Lake owns most of the land, operating part of it as Grant County International Airport.

During groundwater sampling by the Washington Department of Health in 1988 and 1989, elevated TCE levels were found in some of the Moses Lake municipal wells at the former base and in the two Skyline water systems wells.