Water Pressure Regulator (PRV) Installation in San Diego
A water pressure regulator, also called a pressure reducing valve or PRV, is a bell-shaped brass valve on your main water line. It takes whatever pressure the street delivers and holds the house at a safe, steady level. Courtesy Plumbing handles water pressure regulator installation in San Diego for homes that have never had one and for homes where the old one has worn out. We work weekdays, 8 AM to 5 PM. Below: how to test your pressure, what the code requires, and what belongs in a proper install.
Does Your House Need One?
California’s plumbing code is direct about it. Where static water pressure is above 80 psi, an approved regulator has to be installed and the pressure brought down to 80 or less. The City of San Diego repeats the rule on its website and adds that the regulator is the property owner’s responsibility.
Pressure isn’t the same across the city. The City says it varies with location and demand and normally swings about 10 psi up or down through the day. If you suspect a problem in your area, you can ask the City to check. Call 619-515-3525 and a Public Utilities crew will test the pressure at the fire hydrant nearest your home and report back. The City’s meter and water pressure page explains the process.
Test It Yourself in Five Minutes
- Buy a water pressure gauge with a hose thread. Hardware stores carry them.
- Make sure no water is running anywhere in the house, including sprinklers, the washer and the ice maker.
- Screw the gauge onto an outdoor faucet and open the faucet all the way.
- Read the dial. That’s your static pressure.
A reading above 80 on a faucet that is fed through the regulator means the regulator is missing or has failed. Keep in mind that some front hose faucets branch off before the regulator, so test a faucet at the back or side of the house too. If the two readings differ, the front one is showing street pressure.
Already have a regulator and not sure it’s the problem? Our pressure regulator repair page explains how to tell a worn regulator from the things that imitate one.
What High Pressure Does Over Time
- Toilet fill valves that hiss or never quite shut off.
- Banging pipes when a valve closes quickly.
- Dripping from the relief valve on the water heater.
- Supply hoses and appliance connections that fail early.
- Faucets that spit or splash when first opened.
None of these proves high pressure, but two or three together are a good reason to put a gauge on the house.
What a Proper Installation Includes
Part of the job | What we do | Why |
Location | On the main line after the house shutoff valve, above ground and easy to reach. | Code requires the regulator to be accessible, and it has to protect every outlet in the building. |
Size | Match the regulator to the main line, most often 3/4 inch or 1 inch. | An undersized valve chokes flow when several fixtures run at once. |
Strainer | A regulator with a built-in strainer, or a separate one ahead of it, that can be cleaned in place. | Code calls for a strainer on regulators smaller than 1 1/2 inches. Grit is what ruins the seat. |
Valves and unions | A full-flow ball valve and union connections at the regulator. | The next service or replacement takes minutes, with no cutting. |
Expansion tank | Check for one at the water heater, and add it if it is missing. | A regulator stops heated water from pushing back toward the street, so code requires an expansion tank. |
Setting | Set the pressure with a gauge on the house, then recheck it with water running and after the heater cycles. | The number on the box is only a starting point. |
The expansion tank is the item most often skipped. When a regulator goes in without one, pressure climbs every time the water heater fires, and the relief valve on the heater starts to drip. People then blame the new regulator. Our water heater installation page shows how the tank fits in.
New Install or Replacement
Replacing an existing regulator is the simpler job, because the piping is already laid out for it. Our crews have swapped a reducing valve and the shutoff next to it in about an hour. It’s also the moment to fix what the last installer left awkward. On one replacement, with no rush on the job, our plumber reworked the piping at the water inlet so the next service would be easier.
A first-time install takes more planning. We find where the main enters, check that every branch will sit behind the regulator, and decide with you whether the irrigation line should be regulated too. Sprinkler systems are often left on street pressure on purpose, but that choice should be made deliberately.
We prefer all-brass regulators. A customer who asked for a quote by phone got that same price on site, for an all-brass valve. The regulator sits outdoors for years, and brass is what holds up.
Permit
In the City of San Diego, a domestic pressure regulator is on the list of work covered by the Simple No-Plan plumbing permit. When a permit applies to your job, we take care of it and the inspection.
After It’s In
A regulator has a spring and a rubber diaphragm inside, and both wear. Check the house pressure with your gauge once a year. If the reading creeps up, or pressure drops off when two fixtures run together, the valve needs attention. If the whole house feels weak instead, start with our low water pressure diagnosis page, because a regulator is only one of several causes.
To have your pressure tested or a regulator installed, call (858) 567-0544 during business hours, or send your gauge reading through the Contact Us form. Master plumber Tony Misleh opened Courtesy Plumbing in 2007, and we work under California contractor license CSLB #910268.
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