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Thread: Drop in Water Pressure?

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  1. #1
    DIY Junior Member bperillo's Avatar
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    Default Drop in Water Pressure?

    Hi all,

    I am new to the forum. Over the last couple of weeks, I am noticing a dramatic decrease in my water pressure when another source is used. If someone turns on a faucet or flushes the toilet while the shower is running, I get a dramatic decrease in the flow. It slows to almost a trickle. This will last for several minutes even after the other source is turned off.

    This same pressure happens to the sinks. If the dishwasher is on, the kitchen sink pressure goes.

    This is a new development and I am not sure what it could be. Can anyone help with some suggestions?

    Thanks!

  2. #2
    Homeowner Thatguy's Avatar
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    Quote Originally Posted by bperillo View Post
    It slows to almost a trickle. This will last for several minutes even after the other source is turned off.
    Are you on a well?
    Is there a recall on your water heater for diptube problems?
    Copper pipes or iron?

  3. #3
    Moderator & Master Plumber hj's Avatar
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    The most likely problem, unless it is an old, old house with galvanized steel piping, is that you have a pressure reducing valve on your incoming line and it is failing.

  4. #4
    Homeowner Thatguy's Avatar
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    And the PRV service life seems to depend on the "cavitation index"; if you have one how old is it?
    http://www.google.com/images?client=...w=1474&bih=805
    Last edited by Thatguy; 09-18-2010 at 09:50 AM.

  5. #5
    DIY Junior Member bperillo's Avatar
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    Thanks, all.

    House was built in 1986. Copper pipes. No well.

    Where would I find that PRV? How do I tell if it needs to be replaced?

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    IF you have a PRV, it is likely near where the water comes into the house. Many companies make them, but they all look similar. You might check www.watts.com for an example.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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