A sudden onset of banging sounds in your water pipes is typically caused by one of several mechanical changes in your plumbing system. Common triggers include a failed or waterlogged air chamber, a newly installed high-speed appliance (such as an automatic washing machine or dishwasher with fast-acting solenoid valves), a failing pressure-reducing valve (PRV) causing your home's water pressure to spike above 80 psi, or loosened pipe hangers allowing supply lines to vibrate violently against wooden studs. Verification: Test your incoming water pressure with a gauge attached to an outdoor spigot.
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