Hope this is the right place for this question. Older house,built
1950, copper plumbing, city water.
Over night, air seems to build up in faucets and toilets, so when you
turn them on they hiss until the air is gone. Toilet makes a
banging/clunking noise, then flushes.
Can anyone tell me where the air is coming from, or why this is
Overnight, city pressure drops enough (momentarily) to pull
a vacuum and air is drawn into the system.
Maybe ask a few neighbors if they experience anything similar.
Then call the utility to see if they will help.
You could put a pressure gauge on but if the event is short-lived
and random you may not catch it.
It may also be possible that there is some content to the water
which is "gassing" and creates bubbles overnight. Utility would know.
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