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The samples were analyzed for 24 PFAS, major ions, nutrients, trace elements, dissolved organic carbon (DOC), volatile organic compounds (VOCs), pharmaceuticals, and tritium. Fourteen of the 24 PFAS were detected in groundwater, with 60 and 20% of public-supply and domestic wells, respectively, containing at least one PFAS detection. Concentrations of tritium, chloride, sulfate, DOC, and manganese + iron; percent urban land use within 500 m of the wells; and VOC and pharmaceutical detection frequencies were significantly higher in samples containing PFAS detections than in samples with no detections. Boosted regression tree models that consider 57 chemical and land-use variables show that tritium concentration, distance to the nearest fire-training area, percentage of urban land use, and DOC and VOC concentrations are the top five predictors of PFAS detections, consistent with the hydrologic position, geochemistry, and land use being important controls on PFAS occurrence in groundwater. Model results indicate that it may be possible to predict PFAS detections in groundwater using existing data sources.<\/jats:p>","DOI":"10.1021\/acs.est.1c04795","type":"journal-article","created":{"date-parts":[[2022,2,3]],"date-time":"2022-02-03T16:41:21Z","timestamp":1643906481000},"page":"2279-2288","source":"Crossref","is-referenced-by-count":183,"title":["Perfluoroalkyl\nand Polyfluoroalkyl Substances in Groundwater\nUsed as a Source of Drinking Water in the Eastern United States"],"prefix":"10.1021","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7452-2379","authenticated-orcid":true,"given":"Peter B.","family":"McMahon","sequence":"first","affiliation":[{"name":"U.S. Geological Survey , Bldg. 53, MS 415 , , , ,","place":["Lakewood, Colorado, United States, 80225"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4811-8641","authenticated-orcid":true,"given":"Andrea K.","family":"Tokranov","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 10 Bearfoot Rd. , , ,","place":["Northborough, Massachusetts, United States, 01532"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1789-654X","authenticated-orcid":true,"given":"Laura M.","family":"Bexfield","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 6700 Edith Blvd NE , , ,","place":["Albuquerque, New Mexico, United States, 87113"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7180-4319","authenticated-orcid":true,"given":"Bruce D.","family":"Lindsey","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 215 Limekiln Road , , ,","place":["New Cumberland, Pennsylvania, United States, 17070"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tyler D.","family":"Johnson","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 4165 Spruance Road , , ,","place":["San Diego, California, United States, 92101"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5924-6556","authenticated-orcid":true,"given":"Melissa A.","family":"Lombard","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 331 Commerce Way , , ,","place":["Pembroke, New Hampshire, United States, 03275"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elise","family":"Watson","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey , 4165 Spruance Road , , ,","place":["San Diego, California, United States, 92101"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2022,2,3]]},"reference":[{"key":"2026081414092020100_cit1","doi-asserted-by":"publisher","first-page":"4340","DOI":"10.1021\/acs.est.7b05718","article-title":"Per-and polyfluoroalkyl\nsubstances in Swedish groundwater and surface water: Implications\nfor environmental quality standards and drinking water guidelines","volume":"52","author":"Gobelius","year":"2018","journal-title":"Environ. 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