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FILE- In this Wednesday, Aug. 16, 2017 file photo, a "No trespassing" sign is displayed at an old tannery waste dump used by Wolverine World Wide in Belmont, Mich. Some private wells in the area have tested positive for elevated levels of per- and polyfluoroalkyl substances called PFAS, also called perfluorinated chemicals, or PFCs. Michigan, where the large city of Flint continues to recover from a lead-tainted water supply, is now racing to combat a new threat to tap water at sites across the state: chemicals long used in firefighting, waterproofing, carpeting and other products. (Neil Blake /The Grand Rapids Press via AP)

FILE- In this Wednesday, Aug. 16, 2017 file photo, a "No trespassing" sign is displayed at an old tannery waste dump used by Wolverine World Wide in Belmont, Mich. Some private wells in the area have tested positive for elevated levels of per- and polyfluoroalkyl substances called PFAS, also called perfluorinated chemicals, or PFCs. Michigan, where the large city of Flint continues to recover from a lead-tainted water supply, is now racing to combat a new threat to tap water at sites across the state: chemicals long used in firefighting, waterproofing, carpeting and other products. (Neil Blake /The Grand Rapids Press via AP)

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