Re: NANFA-L-- Precipitate

Jerry Baker (
Thu, 26 Jan 2006 08:36:45 -0800 wrote:
> Hmmmmmmmmmm. Don't know where you got info that "virtually all tap
> water in the U.S. is pH>7.0." In much of the eastern part of the
> country the tap water pH<7.0, which is why lead solder is a problem.
> If pH>7.0, lead will remain in the solder. At lower pH, the lead
> mobilizes, and the tap water contains toxic lead.

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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