At least 91 per Northeastern University - https://www.ewg.org/interactive-maps/2017_pfa/ https://www.ewg.org/interactive-maps/2017_pfa/ Here's a different one:

At least 91 per Northeastern University - https://www.ewg.org/interactive-maps/2017_pfa/ https://www.ewg.org/interactive-maps/2017_pfa/ Here's a different one: https://www.bloomberg.com/graphics/2018-3M-groundwater-pollution-problem/ https://www.bloomberg.com/graphics/2018-3M-groundwater-pollu... All public landfills can be added to those maps.