loud low humming noise associated with outside irrigation systems

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by GregGB, Sep 25, 2006.

  1. GregGB

    GregGB New Member

    Sep 25, 2006
    I hope someone can point me in the right directon. Every time the irrigation system comes on we get a low loud humming noise in our house. After we turn off the system the sound remains. It is not constant, it will start softly and gradually, reach its peak noise level and then subside, continuing for some time.

    Also, at the same time, I can turn on our first floor bath faucet and replicate the sound immediately. I can only replicate the sound if the the humming noise took place within the same general time period from the irrigation system.

    Tonight, I turned on the sprinkler system and turned on the bath faucet at the same time. I then turned off the sprinkler system and then turned off the bath fauet and got the sound in a louder version. Every time I turned on the bath faucet the sound subsided somewhat and when I turned it back off the sound got louder. After doing this routine about 4 times the sound dissappeared entirely.

    We are also beginning to get a low much quieter humming noise from the water line to our fridge. It is not constant at all and no indicator of why it comes and goes.

    Any help is appreciated.

  2. Cass

    Cass Plumber

    Nov 12, 2005
    Sounds like it may be a bad PRV (pressure reducing valve). Have someone create the sound and see if the valve is making the sound. It should be located within the first 10' of where the water comes in your house.
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  4. Verdeboy

    Verdeboy In the Trades

    Jun 12, 2006
    Your problem is most likely due to low water pressure. If you have a pressure regulator (PRV), you can try adjusting that. If you don't have one, or adjusting it doesn't work, you can try watering at different times to find a time period when your neighbors aren't using a lot of water. The middle of the night might be the best time to have your sprinklers go on.

    Another possibility is that you have a loose washer somewhere in the system. A loose washer will vibrate rapidly and cause a humming sound. It could be in one of the sprinkler valves, shutoff valves, or even one of the toilet fill valves. It could also be in your PRV, as Cass suggested.

    Here's a link to info about PRV's:

    Last edited: Sep 26, 2006
  5. GregGB

    GregGB New Member

    Sep 25, 2006
    low humming noise

    Thanks so much for responding. I really appreciate the help. I will have a plumber out and make the suggestions you guys made! Thanks again!!
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