more on risks of copper pipe used in residential plumbing,
notice the second bullet below
(2) Lead in Water. The greatest risks seem to occur when the house water
supply is "highly acidic" (see Chapter 7 - Force 5) or is allowed to sit in
the pipes for a long period of time. Lead in the house domestic water system
comes primarily from two sources:
a.. Lead water supply pipes were used in houses until the 1920's. In some
areas, they were used until the 1950's (see Chapter 7 - 7.1).
b.. A 50% lead based solder was used to connect copper water supply pipes
Soldered copper water supply piping may allow lead to leach into water
supply. Check with Poison Control to see whether such a condition is
believed to represent a problem in your area (S, A).
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