You misunderstand what’s happening in Flint. The water coming from the water treatment plant is perfectly safe, the issue is that it is then delivered to custom

You misunderstand what’s happening in Flint. The water coming from the water treatment plant is perfectly safe, the issue is that it is then delivered to customers in lead pipes. This means cleaning up the water doesn’t involve removing lead at the treatment plant, which is normal, but rather replacing all of the water pipes in the city, which is very very hard. In fact removing various heavy metals from water is a regular thing that water treatment plants do, including metals like uranium and chromium. The takeaway from Flint is not “we can’t remove uranium from ground water”, but rather “don’t build your water distribution network out of toxic heavy metals like lead”.