'Forever' chemicals leave costly water problem in Bemidji, cities across the country

Keith Rapp pours filtered water into a filtered water bottle.
Keith Rapp has an elaborate filtering system he uses to ensure his water is as free of PFC's as possible. Rapp lives in the east Twin Cities metro, where the groundwater was contaminated by chemicals produced for decades by 3M. Officially, the city water connected to Rapp's house is safe to drink. But Rapp, a hydrogeologist who deals with groundwater contamination for a living, said he's worried about the possible effects of PFCs since he first learned of their presence more than a decade ago.