Flint's water has been toxic for some time now due to a budget decision made over a year ago. You can see the CNN story here:
How Tap Water Became Toxic in Flint, Michigan
You may find the NPR stories helpful as well. Give them a listen if you want.
High Lead Levels in Michigan Kids After City Switches Water Source
and this one:
Who's to Blame for Flint's Water Problem
