You have got Obama’s actions in the Flint water crisis exactly backwards. He was not denying that there was a problem. He was saying that it was OK to drink the water AFTER he had ordered Federal government intervention to clean the water up. He took extensive action to fix the problem and got real results.

https://www.pbs.org/newshour/nation/obama-drinks-filtered-city-water-in-flint-to-show-its-safe