Water Hammer and Hot Faucet Noise: Causes and Fixes

Water hammer (hydraulic shock) causes banging pipes when flow stops abruptly (faucet closure, appliance valve shutoff).

Common Causes & Solutions

1. Water Hammer: Install water hammer arrestors or pressure-balance valves at fixture.
2. Excessive Water Pressure: >80 psi stresses pipes. Install pressure-reducing valve (PRV) at main supply.
3. Worn Faucet Parts: Failed washers/O-rings cause sputtering. Replace cartridge or seals.

Diagnose by noting when noise occurs (valve closure vs. continuous). A plumber can measure pressure and install appropriate devices.