"DAVID ALEXANDER" wrote in message news:950f6$45533fc9
6. I've turned off everything possible inside the house (toilets), and
the water still runs.


Do you have hot water baseboard heat? Is there an automatic fill valve on
it?


I just hope it doesn't require tearing into the slab to try to determine
where the leak is.

This is what made me think of hte baseboard leaking. I had a similar
problem, but it was a mere trickle. Took a couple of days to finally find
th eleak as it was not visible.