The Environmental Working Group says one sample taken from the Philadelphia-area showed PFAS recorded at 46 parts per trillion. But Kelly Anderson, manager of the Water Department's Watershed Protection Program, says the EWG did not provide enough information.
"With limited study information, it's impossible for us to say that the results are representative of Philadelphia's drinking water quality. And due to a lack of scientific process used in the EWG report, we cannot agree with it's conclusions," she said.
She says PWD has an ongoing voluntary research program in place right now in efforts to understand PFAS, which appear in the region's drinking water.
Anderson says results from the program will be released later this year, maybe as soon as the summer. Anderson also says PWD tests for PFAS from 2014 showed levels far below the EPA health advisory level of 70 parts per trillion.
She says PWD is doing all it can do to protect Philadelphia's drinking water.