Why Your Faucet Makes a Knock Noise When It’s Turned On

Have you ever wondered why your faucet makes a knock noise when it’s turned on? Well, it turns out that the sound is actually a safety feature. The noise your faucet makes when turned on lets you know that the water pressure in your sink is strong enough to prevent any accidental scalds and accidents. It also helps prevent the faucet from being turned on accidentally due to vibrations, which can cause damage to the water system in your home. So, if you hear a loud knock when you turn on your faucet, that’s good news! It means that you can use your faucet without causing problems for yourself or anyone else.


What Causes the Noise?

Why Plumbing Pipes Make Noise and How To Stop the Hammering or Whistling Sound

The sound your faucet makes also called water hammer when it’s turned on is actually a function of the water pressure. The noise is most likely caused by the movement of water in the system. As the water moves, the sound will become louder and then decrease as the water flow slows down.

There are two common causes for this noise:

  1. If your faucet has been turned off for an extended period of time and then turned on again, it may make a knocking noise or clanging sound because there is a chance that air bubbles get trapped in the pipe system.
  2. If you’re using your sink to fill a large bucket or pitcher, the clang or knock may be attributed to vibrations from someone moving around nearby or from outside sources such as airplanes flying nearby.

If you hear the knocking sound, there are a few things that you can do:

  1. Turn off the faucet, remove the aerator (if applicable), and run cold water for a few minutes to flush out any trapped air.
  2. If your sound is coming from inside your home, then try turning off your water main valve nearby. This will cut off the water pressure and allow it to flow through the pipes slowly.  If this is not possible, call a plumber to patch up any leaks in your pipes or replace them with new piping.
  3. If you’re using a pitcher or bucket to fill up with water, then make sure that you don’t have anything blocking the pipe so that the water can flow freely.

If you continue to hear the clanging sound and it’s not coming from the sink faucet, then it’s time to take action.


Why Is the Knocking Noise Important?

The knock noise your faucet makes when turned on is important because it’s a safety feature. The sound lets you know that the water pressure in your sink is strong enough to prevent any accidental scalds and accidents. It also prevents the faucet from being turned on accidentally due to vibrations, which can cause damage to the water system in your home.


What Can You Do to Prevent Scalds?

The most important thing you can do to prevent scalds is to make sure that your faucet has a strong enough water pressure. If your faucet doesn’t have strong enough water pressure, it can cause accidents. For example, if you’re filling a pitcher with water and you accidentally turn the faucet on, the water pressure can be strong enough to cause you to lose control of your pitcher and it may even bounce off of the countertop.

If you’re trying to fill anything larger than a small cup or bowl with your faucet turned off, make sure that the faucet has enough pressure in it. To check how strong your current water pressure is, use a kitchen water pressure tester.


Why Doesn’t Your Faucet Make a Knocking Noise When It’s Turned Off?

If your faucet makes a knocking noise when it is turned on, this is because the sound is actually a safety feature. The noise your faucet makes tells you that the water pressure in your sink is strong enough to prevent any accidental scalds and accidents. It also helps prevent the faucet from being turned on accidentally due to vibrations, which can cause damage to the water system in your home.


Conclusion

The majority of faucets are made from metal and can be easily turned on or off. If you notice that your faucet is making a different sound when you turn it off or on, it may be the sound of an old faucet. You can easily tell if this is the case by turning the water back on and listening for any knocking noises that occur when you turn the faucet handle. If you don’t hear any knocking noises, then your current faucet is probably not made from metal.

If you hear knocking noises while your faucet is turned off, this may indicate that there’s a problem with the water system in your home (see above). This usually means that there’s a leak in your home’s water pipes and that you should call a plumber.