With the except of one dataset, all Flint water data have been acquired from the Healthy Flint Research Coordination Center: Open Data Flint from ICPSR at https://www.icpsr.umich.edu/icpsrweb/odf/studies/36955:
Michigan Department of Health and Human Services. State of Michigan: Taking Action on Flint Water Test Results, 2015-2017. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2017-11-13. https://doi.org/10.3886/ICPSR36955.v1
Watch the NOVA Episode: Poisoned Water.