Pressure Reducing Valves: When Home Water Pressure Is Too High

This short guide relies on one source, the City of Tustin, California, page on high water pressure. A second source (Moen press room) was fetched but contained no PRV information.

What the city says

A PRV may be needed when pressure exceeds 80 psi (the page also says "80 psi or greater", so the exact threshold wording is inconsistent).
Under the Uniform Plumbing Code, the owner installs and maintains the PRV when static pressure is above 80 psi.
A PRV lowers pressure but cannot raise it.
Most plumbing professionals suggest a setting between 35 and 60 psi.
Sustained pressure above 80 psi can damage plumbing and fixtures.
It goes on the customer's side of the water meter, often near the water heater or inlet line.
The city recommends a licensed plumber for adjustment and service.

Not verified: whether your jurisdiction adopts the Uniform Plumbing Code, PRV lifespan, and any link to thermal expansion (see our expansion tank article).

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General information only. Not plumbing, legal or code advice. Confirm with a licensed plumber and your local building department.