My house is about 20 yrs old so not new new but not super old either.
The problem I'm noticing now is the water pipes seem to be making a banging sound even though no one is using anything that requires water. For example, if I flush the toilet, there will be a short bang after the tank fills. While the washing machine or dishwasher is running and it goes thru its cycles, there will be banging after the tub fills up.
I'm noticing late at night when everyone is asleep, there is banging but when I check, no one is up and/or no appliances are running. I thought someone might be stealing water in the dead of night (yes, very lame thought) but I took the metal handle off and there's still banging.
I've shut off the water to the toilets to see if one of the flaps were leaking but that's not the case. I've also checked if any faucets were leaking, which they weren't. I also checked the water heater to make sure it's not leaking either, which it isn't. I also thought about a leak to the back sprinkler system but I shut it off for 2 months but it also isn't leaking.
The water usage according to my water bill has been consistent the last year and it seems to be par with my neighbors when we calculate the units used per person. Don't quote me but I think 1 unit = 600 gallons of water so about 2000 gallons per person per month seems reasonable.
So back to the original question, is there a leak somewhere I'm not aware or is this how homes are and I shouldn't worry about it?