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  • Writer's pictureGilad Ifrach

When I turn off the faucet in the shower I hear a noise from the water pipe, what is this coming from?

Updated: May 28

The noise you're hearing from the water pipe when you turn off the faucet in the shower is likely due to a phenomenon known as "water hammer." Water hammer occurs when the flow of water is suddenly stopped, causing a pressure surge or shock wave to travel through the pipes. This can create a loud banging or thumping noise.

Here are a few common causes of water hammer:

  1. Sudden Valve Closure: Quickly turning off the faucet can cause the rapid stopping of water flow, leading to a pressure spike.

  2. High Water Pressure: If the water pressure in your home is too high, it can exacerbate the effects of water hammer.

  3. Loose Pipes: Pipes that are not properly secured can move and bang against walls or other pipes when the water flow is abruptly stopped.

  4. Air Chambers: Some plumbing systems have air chambers designed to absorb the shock of water hammer. Over time, these can become filled with water and lose their effectiveness.

Solutions

  1. Slowly Close Faucets: Try to close the faucet more gradually to reduce the sudden stop in water flow.

  2. Install Water Hammer Arrestors: These devices are designed to absorb the shock wave created by water hammer.

  3. Check Water Pressure: Ensure that the water pressure in your home is within a normal range (usually between 40-60 psi). You can use a pressure gauge to measure this and install a pressure-reducing valve if necessary.

  4. Secure Loose Pipes: Make sure all pipes are properly secured with clamps or straps to prevent movement.

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