Three Wright-Patterson Air Force Base wells yielded samples with concentrations of polyfluoroalkyl substances (PFAS) above 70 parts per trillion (ppt) in February, with one well located at the base boundary and two on Wright-Patterson's Area A.
To determine if those and other sample sites pose a threat to local drinking water, more work is needed, members of the base's Restoration Advisory Board said Monday.
“That's why we're evaluating the sites,” said Raymond Baker, chief of the 88th Civil Engineer Group Environmental Branch at Wright-Patterson.
Between 2016 and 2022, the U.S. Environmental Protection Agency stuck to an advisory health limit of 70 parts per trillion (ppt) for PFOS and PFOA chemicals, two compounds commonly produced and used for decades. The agency has recently proposed stricter standards.
Compared to 2022 regional screening levels, 13 base wells yielded samples of Perfluorooctanoic acid (PFOA) above 6 ppt and five wells gave samples of Perfluorooctane Sulfonate (PFOS) above 4 ppt, the board said.
PFOS and PFOA are PFAS chemicals. All are human-made compounds that do not occur naturally in the environment.
One site the base continues to monitor is about 100 yards from the Mad River, the board said.
“All of our monitoring wells, we sample those,” Baker said. “We sample our drinking water (base drinking water) on a monthly basis.”
“The drinking water that the base provides to the base community is below…