toilet water hammerWater hammer at a toilet is common. Water hammer is caused by a sudden shutting off of the water. This causes a shock wave and can lead to loud noises as the shock wave rumbles around until its energy has dissipated. The shock wave is most commonly caused by an electric valve, such as a washing machine or dishwasher, but someone slamming their hand on a faucet handle can cause it too.

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With a toilet, the refilling and shutting off of the water can lead to noises, but not necessarily water hammer. In a lot of cases, people who think they have water hammer, only have a toilet fill valve that is going bad. It can vibrate as water passes and then make a loud “thud” as the water is shut off. Another common source of noise can be the angle valve. As water passes through it, you can get some vibration that sounds like a whine. You can certainly replace this and the noise should stop.

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If you have true water hammer, you can install a water hammer arrestor near the offending fixture. They attach to the water supply. For a toilet, you would only have one arrestor, but for a washing machine you would have both hot and cold supply locations.

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