The problem for the sprinkler contractors is that most plumbing licensing laws require the backflow preventer to be installed by the plumbing contractor. Some laws go even farther - requiring a licensed plumber to install all of the piping up to the backflow preventer.

How much does it cost to install a backflow preventer?

On average, backflow preventer installation costs about $300. Most homeowners pay between $135 and $1,000 depending on the size and type of the system. The device itself ranges from $35 to $600, while professional labor costs between $100 and $400.

Can a plumber install a backflow preventer?

For this reason, you must only entrust the work to licensed professionals. A certified plumber will make certain that the right size of backflow preventer is installed into your plumbing and that it seals correctly so there is no danger of allowing sewage into your freshwater lines.