Not necessarily, as many minor water hammer issues can be resolved with simple DIY fixes. If banging noises occur when turning off specific faucets, you can often fix the issue by draining your home's entire plumbing system to recharge the air chambers, or by securing loose supply pipes with cushioned pipe straps. However, if the water hammer is severe, stems from high municipal pressure exceeding 80 psi, or requires installing specialized piston-type water hammer arrestors behind walls, hiring a licensed plumber is recommended. Verification: Check incoming water pressure using a gauge attached to an outdoor spigot.
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