Heathcliff wrote:

I am curious about that too. I am thinking that there is a very small
amount of surface area of solder exposed to the water, and that prior
to 1990 or whenever they banned leaded solder, every copper water pipe
in the country was soldered with tin-lead solder, without much in the
way of bad effects. Also if your water is like ours, it tends to line
the inside of the pipes with minerals anyway. But, then why did they
ban leaded solder?

Because the "WE'RE ALL GONNA DIE!" crowd are very loud.