Incompetence and/or corruption, my opinion.
I used to work at a large Summer retreat in the N. C. mountains.
One day I happened upon the guy responsible for the water while he was testing a well. I helped him do something small and asked him about a small stream which came out of the mountains next to the rec area. I asked him if he had ever had the creek water tested.
He said he had and that it contained bacteria tho not so much that it was particularly dangerous. He said he would not drink it tho except in an emergency.
I asked him about the wells and he said there had always been zero bacteria or anything else dangerous in the wells. He said they treated it anyway just to be sure.
Democrats, Urban Democrats.