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Question DetailsAsked on 7/1/2017

Sprinkler line is making a buzzing sound between heads . No evidence of leak but no pressure beyond sound. Ideas?

One sprinkler line buzzes between heads 1 & 2 with low pressure past head 1. Line passes under some bushes, trees, and flagstone. Have dug near the buzzing/humming sound (not a hiss) and can find no obvious leak. No evidence of leaking in the yard by way of wet spots, sinking flagstone etc.. Could this be a clogged line? Or pinched by a tree root or something? I don't want to dig up the whole line if it is something easier to fix. Amy thoughts you might have would be welcome.

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1 Answer


Sounds like a very small leak or an obstruction causing cavitation - so creating a lot of gas bubbles (the buzzing) and letting just a bit of water through - could be a root obstruction if a flexible line, otherwise maybe a junk piece of plastic was in the line and broke free and clogged it. OR could be a blockage at the sprinkler head #1 and for some reason the sound just comes up better at mayhbe a very shallow point in between.

I would follow along the line with a stethoscope, or listening at a piece of pipe or metal rod held tight to the ground, or even crawling along and holding ear to the ground, to track down the exact location. Then dig down to it (should be less than a foot deep) and locate the exact spot causing the noise - obviously if a leak you will get flooding (if that zone is on) - but mark the spot, then turn off system. Then either get a Lawn Irrigation contractor (your search the List category) to fix it , or cut the line and fix it yourself.

Answered 3 years ago by LCD

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