High water pressure outside; low inside house

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by cepperson3, Sep 4, 2010.

  1. cepperson3

    cepperson3 New Member

    Messages:
    4
    Location:
    Charlotte, NC
    I have been searching for an answer to my unique problem and I hope someone can help. I have extremely high water pressure on the outside front hose bib (115 PSI). I've already had to replace part of the water pipe coming in from the street probably because of the high pressure. The plumber who did this could not figure out why the pressure is so high outside but so low everywhere inside. He said if I put a pressure regulator valve on that it would probably reduce the inside pressure even more. Anyone have any ideas? Thanks!
  2. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    My first thought was that your pressure regulator is defective. Your symptoms are classic for that. But you seem to indicate there isn't one. I would look for one somewhere, because otherwise you need to call in Dick Tracy!
  3. Ian Gills

    Ian Gills Senior Robin Hood Guy

    Messages:
    2,780
    Location:
    USA
    Is the pressure low or the flow low inside? Don't confuse the two.

    Did he measure the pressure inside as well?

    Low flow can be caused by pipes that are narrow.
  4. cepperson3

    cepperson3 New Member

    Messages:
    4
    Location:
    Charlotte, NC
    I don't remember if he measured the pressure inside, so I guess the flow is low.
  5. cepperson3

    cepperson3 New Member

    Messages:
    4
    Location:
    Charlotte, NC
    The plumber did not see a pressure regulator installed. I'm thinking of calling another plumber for a second opinion. Thanks.
  6. cepperson3

    cepperson3 New Member

    Messages:
    4
    Location:
    Charlotte, NC
    I don't remember if he measured the pressure inside, so I guess the flow is low.
  7. Terry

    Terry Administrator Staff Member

    Messages:
    14,782
    Location:
    Bothell, Washington
    The PRV may not include the hosebib. That can happen. I would trace the lines back and see if I could spot an old PRV, which may need replacement.
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