From the Detroit News:
An EPA water expert, Miguel Del Toral, identified potential problems with Flint’s drinking water in February, confirmed the suspicions in April and summarized the looming problem in a June internal memo. The state decided in October to change Flint’s drinking water source from the corrosive Flint River back to the Detroit water system.
Critics have charged Hedman with attempting to keep the memo’s information in-house and downplaying its significance.
As soon as the lack of corrosion controls became apparent, state and federal officials should have acted to protect the public, said Virginia Tech researcher Marc Edwards, whose water analysis in 2015 helped uncover Flint’s lead contamination.
As discussed in Episode 0005.