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Over time, some PFAS released from manufacturing sites, landfills, firefighting foam, and other products seep into surface soils. From there, they can leach into groundwater and contaminate drinking water. PFAS are also in rivers, lakes, fish, and wildlife. Exposure can occur when someone uses certain products with PFAS or consumes contaminated food or water. When ingested, some of these chemicals can build up in the body and, over time, may increase to a level where health effects could occur.