The group tested the drinking water at 44 sites in 31 states and Washington for PFAS chemicals.
Of the areas tested, only Meridian, Mississippi, had no detectable levels of the toxic chemicals. The community draws its drinking water from wells more than 700 feet deep, the group said.
The water supplies in Brunswick County, North Carolina, and Quad Cities, Iowa, contained the highest levels of the chemicals, more than 100 times the EWG’s suggested limit. The advocacy group’s recommended PFAS limit is 1 part per trillion in drinking water, about 70 times stronger than federal recommendations.
The potential harm of PFAS
Agencies disagree on PFAS limits
In 2016, the EPA released a non-enforceable lifetime health advisory for PFOA and PFOS at 0.07 parts per billion in drinking water, or 70 parts per trillion.
In 2018, the Agency for Toxic Substances and Disease Registry, a division of the US Department of Health and Human Services, indicated that the “minimal risk levels” for oral exposure to PFOS and PFOA should be seven to 10 times lower than what the EPA currently suggests.
The only cities that fell within the EWG’s 1 part per trillion PFAS limit were Seattle, Memphis and Tuscaloosa, Alabama, according to the report.
More than half of the sites tested in the Environmental Working Group report exceeded its suggested levels.