Probably a leak i imagine, any advise on finding this type of leak? Thanks in advance.



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Most sprinkler installations are done in zones. So figure out which zone has the leak, that will narrow down the area. You can determine this by watching which zone is operating when the house loses water pressure. Then walk around after that zone has been operating, look for mushy ground where the water has saturated. The sprinkler piping generally runs from one sprinkler head to the next, with a pipe from the zone control valve running to the closest head. You could have a broken pipe from winter freeze or a tree root bending it too much and it cracked, or a damaged sprinkler head. Also check the sprinkler heads in that zone, sometimes they come loose from the buried water pipe.



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We need to know if there is a flaw in your thinking......Why do you believe it is a leak? What do you base that on?

If the systems were not properly sized then you will notice quite a pressure drop when the sprinklers come on.

IT would have to be a tremendous leak to affect the house pressure, and if so there should be a "pond of water" wherever the leak is.