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When the residents of Flint learned that lead had contaminated their water system, the local government made water-testing kits available to them free of charge. e city government published the results of these tests, creating a valuable dataset that is key to understanding the causes and extent of the lead contamination event in Flint.is is the nation's largest dataset on lead in a municipal water system.In this paper, we predict the lead contamination for each household's water supply, and we study several related aspects of Flint's water troubles, many of which generalize well beyond this one city. For example, we show that elevated lead risks can be (weakly) predicted from observable home a ributes. en we explore the factors associated with elevated lead. ese risk assessments were developed in part via a crowd sourced prediction challenge at the University of Michigan. To inform Flint residents of these assessments, they have been incorporated into a web and mobile application funded by Google.org. We also explore questions of self-selection in the residential testing program, examining which factors are linked to when and how frequently residents voluntarily sample their water.