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High Water Pressure and Leaks: Is Your Pressure Regulator Failing?

By the Murrieta Leak Pros team ·

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Murrieta is built on hills, so street water pressure changes a lot from one neighborhood to the next. Most homes have a pressure regulator, or PRV, near the main shut-off to bring it down to a safe level. When that valve wears out, pressure climbs and starts to stress every pipe, hose and fitting in the house. This guide explains the signs of high water pressure, a simple gauge test and why it leads to leaks. Our water leak detection team answers 24/7 at (951) 299-3473.

What water pressure is too high for a home?

Most homes work best between about 50 and 70 psi. Plumbing codes in California set 80 psi as the upper limit inside the home, and a regulator is required when street pressure is higher. Above 80 psi, faucets, toilet fill valves, water heaters and appliance hoses wear out much faster and leak sooner.

Homes lower in the valley and homes near the bottom of a long slope often see the highest street pressure. That is why the regulator matters more in some Murrieta tracts than others.

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Technician testing for a hidden leak with detection equipment at floor level
Technician testing for a hidden leak with detection equipment at floor level

What are the signs of high water pressure?

Common signs are banging pipes when a tap closes, faucets that spray hard or splash, toilets that run or refill on their own, a water heater relief valve that drips, short life on hoses and faucet parts, and repeat leaks at fittings. If you see two or more of these, test the pressure.

  1. Banging or knocking pipes (water hammer) when the washer or dishwasher valve shuts.
  2. Running toilet that hisses or refills with no one using it. See our toilet leak test.
  3. Dripping relief valve on the water heater. Our water heater leak guide covers this valve.
  4. Burst or bulging hoses on the washer or under sinks.
  5. Faucets that drip soon after new washers or cartridges.
  6. Repeat pinhole leaks in copper lines.

How do I test my home's water pressure?

Buy a simple pressure gauge that screws onto a hose bib, which costs about $10 to $15 at a hardware store. Turn off all water in the house, screw the gauge onto the outdoor faucet nearest the regulator, and open the faucet. Read the gauge, then check it again overnight. A reading above 80 psi, or a needle that creeps up over time, means the regulator needs attention.

  1. Turn off all taps, sprinklers and appliances.
  2. Screw the gauge onto a hose bib after the regulator.
  3. Open the faucet fully and read the pressure.
  4. Leave the gauge on overnight if it has a max needle.
  5. Compare day and night readings.

Pressure that rises at night can mean the street pressure goes up when demand drops, or that the water heater is pushing pressure up as it heats. A thermal expansion tank on the heater helps with the second problem.

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Why does high water pressure cause leaks?

Every pipe joint, valve seat and rubber seal is built for a pressure range. Above that range they are under constant stress, and each sudden shut-off sends a spike through the lines. Over time that wears thin spots in copper, splits braided hoses, and loosens fittings. The leak often shows up far from the regulator, inside a wall or under the slab.

High pressure is one of the causes behind copper pinhole leaks and slab leaks in Murrieta. If you have had more than one leak in a few years, test the pressure before you repair the next one. Low pressure can point to a leak too, as explained in our low water pressure guide.

What should I do if my pressure is too high?

If the regulator can be adjusted, a plumber can turn it down to about 60 psi. If it is worn, crusted or over 10 to 15 years old, it is usually replaced. After the pressure is fixed, check for leaks the high pressure may already have caused, since a fitting that was weeping may keep leaking even at normal pressure.

A leak check after a pressure problem looks at the meter, the water heater, toilets, hoses and hidden lines. Here are approximate costs for the leak side of the job.

Approx. costs in Murrieta (estimates for planning only)
ServiceApprox. cost
Hidden water leak detection visit$200 to $550
Slab leak detection (typical home)$250 to $650
Spot repair on an accessible pipe$300 to $1,500

We serve Los Alamos Hills, Bear Creek, Copper Canyon and every Murrieta neighborhood. Our leak repair crew gives you the price before any work starts.

Frequently asked questions

What is normal water pressure for a house in Murrieta?

Most homes do best at about 50 to 70 psi. Pressure over 80 psi inside the home is above the plumbing code limit and should be lowered.

Where is the pressure regulator in my house?

In most Murrieta homes it is a bell-shaped brass valve on the main line, near the front hose bib or main shut-off where the line enters the house.

How long does a pressure regulator last?

Many last about 10 to 15 years. Hard water can shorten that by building crust inside the valve.

Can high water pressure cause a slab leak?

It can add to the risk. Constant high pressure and pressure spikes stress copper lines under the slab, along with hard water and age.

Prices are approximate estimates for planning. Your final price depends on your property and is confirmed before work begins.

Where can I get help with this in Murrieta?

Murrieta Leak Pros offers Water Leak Detection, Leak Repair & Trenchless Pipe Repair. We serve every Murrieta neighborhood:

We also serve Temecula, Menifee, Wildomar, Lake Elsinore, Winchester, French Valley, Canyon Lake, Hemet and Sun City. See all service areas →

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