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Backflow preventers

Backflow preventers for homes and businesses

A backflow preventer keeps water from running backward into the clean supply. CR Plumbing installs and replaces them for homes and commercial properties.

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Se habla español. Licensed plumbing contractor, CSLB #1138178.

“Honest and thorough and a good price! Will use again.”

Gustavo R., Jun 2026, on Yelp
A brass backflow preventer with green handles mounted on a wall
A backflow preventer, mounted

A backflow preventer, mounted

A backflow preventer keeps water from running backward into the clean supply. This one sits on a wall with its valves on the line.

Signs it is time

  • A new commercial property or kitchen that needs one
  • A preventer that leaks or has failed
  • An irrigation or fire line that calls for one
  • A property you are upgrading that has none

How the job goes

  1. What does it protect?

    The line it guards and where it sits decide which preventer goes in.

  2. Mount and connect

    Set on the wall and tied into the supply, like the one in the photo above.

  3. Homes and businesses

    Gustavo R. wrote that CR Plumbing was honest and thorough on a backflow preventer for a commercial property.

Good to know

Do you work on commercial backflow preventers?

Yes. One customer wrote that they needed a backflow preventer for a commercial property and found CR Plumbing honest and thorough, at a good price.

Call CR Plumbing.

Describe what you see. CR Plumbing will tell you what it thinks is wrong, and what to do about it.