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dpb

wrote:
during two recent below 20 degree nights, an icicle has formed on one
of the outdoor water faucets. there is no apparent leak, and no
problem is visible

there was one time in the summer where it appeared to leak at the point
where the faucet attaches to the pipe, but there has been nothing since.

That's not true (unless the water dripped from somewhere else and just
happened to land on the pipe/faucet). There is obviously a slow leak
that was slow enough to evaporate in warmer weather, but not in cold.
You have a slow leak w/o question.