It was released by Northeastern University and the Environmental Working Group, which found Perfluorinated compounds, or PFCs, in 162 drinking water systems across the United States.
PFCs are often used in products like cookware and waterproof clothing, though manufacturers have claimed the dangerous PFCs are no longer used in these products.
The toxic chemicals are linked to health issues like cancer and weakened immune systems.
PFC's are not classified as a federally regulated water contaminant like lead or arsenic.
CLICK HERE to read the full study.
Here is an interactive map of locations identified in the study: