PFAS Detected in Samples of Untreated Well Water in Delaware

USGS map showing the number of PFAS detected in samples of untreated well water in Delaware that are supplied by the Columbia aquifer. The aquifer supplies groundwater to areas within the Atlantic Coastal Plain, which includes most of Delaware and portions of other states. The area of Delaware that receives groundwater from the aquifer is the Delaware Atlantic Coastal Plain, which is below the map's purple line known as a "fall line.”