[ewmyers]

Hi,

While trying to figure out how 2 people in a small house could use so much water, I discovered that the plumbing in my house loses pressure. If I have no water running in the house, I have 80 pounds of pressure. If I then shut off the main to the house, pressure drops to 40 pounds within a minute or two. None of my faucets drip, and the toilet doesn't run. There is an additional gate valve shutoff at the back of the house that leads to a spigot and 2 sprinkler valves, but there is no leaking there either. I can't find any leaks in the plumbing under the house, which is all copper.

Is there something other than a leak that could cause this, or is this normal? Or is there just definitely a leak that I can't find? How much water would have to be lost through leakage to produce such a drop in pressure? Drops? Teaspoons? Cups? Gallons?

Thanks, this has got me totally stumped.
Eric