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Some plumbers call this hammerback. The pipes in the walls and slab will move if not properly secured, insulated, or are just plain old and weak. But this is only one possible cause of a groaning water system.
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Another possibility is a loose washer on a shutoff valve that is vibrating in the flow of the water.
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How about a noisy ballcock. This is the fill valve, which may allow a vibration in the valve, not unlike the vibration when blowing a wind instrument. We have run into ballcocks so loud that a next door neighbor could hear it with both houses closed up. It can make noise throughout the house, so that you cannot localize its origin. Some have thought their water heater was about to blow up. A test that may prove this is to let the tank fill, then gently bob the float up and down to allow varying amounts of flow through the valve. You may be able to "duplicate" the problem it as this.
First answer by ID0000000000. Last edit by Mhickson. Contributor trust: 69 [recommend contributor]. Question popularity: 209 [recommend question]
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