A sudden onset of water hammer in a previously quiet plumbing system is usually triggered by one of several specific mechanical changes. Common causes include a failed or waterlogged air chamber, a newly installed high-speed appliance (like a modern washing machine or dishwasher with electronic solenoid valves), a failing pressure-reducing valve (PRV) causing municipal water pressure to spike above 80 psi, or newly loosened pipe straps that allow supply lines to vibrate violently against wooden framing studs. Verification: Check your household water pressure with a gauge attached to an outdoor spigot.
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