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Question DetailsAsked on 5/13/2014

How much would it typically cost to install a backflow preventer for irrigation system?

I am considering installing a yard irrigation system as a DIY project. I believe I can do everything except the installation of a backflow preventor. This is most likely going to require a professional plumber to do this part. I live in Falls Church / Arlington VA area. Does anyone know how much it would typically cost for such an installation?

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Backflow preventer is about $50-100 depending on type required by your local code - just one more device you put in line, in the water line that feeds the irrigation system. No reason you can't do it yourself - just pay attention to direction of flow, and some have to be oriented in a certain direction - usually on a vertical pipe with outflow to the top, but not always, and you can buy ones designed to go in horizontally. Local plumbing supply shop (not box store) should be able to tell you what you need for your design flow rate and pressure, and to meet local code.

Here is a picture of a typical one - can get in solder or threaded configurations -

Answered 6 years ago by LCD

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