Exactly the reason, along with the infrastructure costs associated with
deteriorating pipes caused by acidic water. I know there are utilities
that haven't figured out yet that a few cents worth of lime can protect
the population from lead poisoning as well as help keep maintenance
costs down, but it's fairly widespread. Unless a water utility is bent
on poisoning its customers and spending more money on repairing mains, I
can't imagine why they would deliver acidic tap water. It costs almost
nothing to add some lime.
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