Why Do I Hear Knocking Noise When I Turn On the Water in My Home?

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Do you hear a knocking sound every time you turn on the water in your home? If so, you're not alone. This is a common problem that many homeowners face, and it can be caused by several different factors. Understanding the cause of this noise can help you determine the best course of action for fixing it.

high water pressure

Water Hammer

Water hammer is a term used to describe the knocking sound that occurs when you turn off a faucet or valve quickly. This sound is caused by a sudden change in water pressure, which creates a shockwave in the pipes. To fix this issue, you can install a water hammer arrestor, which is a device that helps absorb the shock and reduce the noise.

Loose Pipes

If your pipes are not securely fastened, they can rattle and make a knocking sound when water is flowing through them. This is especially common in older homes with galvanized steel pipes. To fix this issue, you'll need to have a plumber tighten the pipes and secure them in place.

High Water Pressure

High water pressure can also cause knocking sounds in your pipes. If the water pressure in your home is too high, it can put too much stress on your pipes and cause them to rattle. To fix this issue, you'll need to have a plumber install a pressure reducing valve to lower the water pressure.

Air in the Pipes

Air trapped in your pipes can cause knocking sounds when the water is turned on. This is because the air creates pockets of turbulence that can make your pipes vibrate. To fix this issue, you'll need to have a plumber bleed the air from your pipes to eliminate the turbulence.

Unwanted House Guest

Here in the Houston region it could actually be a four legged friend in your attic. If the unwanted animal is near plumbing pipes the water being turned on might cause them to stir and could cause noises.





If you're not sure what's causing the problem, it's best to contact a professional plumber for an inspection and diagnosis. They will be able to determine the cause of the knocking sound and recommend the best course of action for fixing it.