My first post on here (and hopefully my last).
For several weeks now, we have humming noises in our pipes. Not often, just when a faucet is turned on, the toilet is flushed, or the shower ran for an hour or so after no water has been run.
The noises stop several seconds after the water is on. There are no humming noises at all if water has been run shortly before.
I am not sure where to start. Different people tell me different things, just looking for more opinions.