Disposal causes a low-frequency humming or buzzing noise in nearby plumbing even when not running.

Safety First: Ensure power is OFF before working near the disposal. This issue is usually plumbing-related, not electrical.

• Step 1 – Isolate source: Turn the disposal OFF and run only water. Shut the faucet quickly and listen for noise.
• Step 2 – Secure pipes: Add or tighten pipe clamps and supports on hot and cold water lines under the sink.
• Step 3 – Use soft mounts: If the disposal shares a bracket with other equipment, add rubber isolation pads to reduce transmitted vibration.
• Step 4 – Consider water hammer arrestor: If hammer is severe, have a plumber install a water hammer arrestor on the supply line.