I've had a problem over the last year or so with loudly humming pipes while and after running water anywhere in the house. Interesting thing is, I can go outside and crack the hose spigot slightly and the noise stops. I installed an expansion tank at the water heater last year and it seemed to subside for a while, but it's back again in force. If I shut off the supply to the outdoor faucet (after the regulator), it also stops. I'm sure the problem is with the long run to the outside spigot, but I'm not sure what I need to do to stop it and still have outside water.
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