How often should you replace a pressure-reducing valve?
Updated July 2026
A pressure-reducing valve lasts 7 to 15 years, and you replace it the moment house pressure starts creeping past 80 psi even after you adjust it. The PRV sits where the city main enters the house and steps that high, variable street pressure down to a safe, steady level. Inside it, a spring and a rubber-seated diaphragm do the work, and both wear out, so a valve that once held a firm 55 psi slowly loses its grip and lets pressure rise. Since code caps a home at 80 psi and the ideal is 50 to 60 psi, a $10-15 gauge tells you when the PRV is done.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Pressure reads over 80 psi | Adjust, then replace if it will not hold | Code caps a home at 80 psi for good reason |
| PRV is 10+ years old | Plan replacement | Seats and springs wear out with age and cycling |
| High or fluctuating city pressure | Expect 7-10 years | Harder duty wears the internals faster |
| Water hammer or banging pipes | Test pressure, suspect the PRV | A failed valve often shows up as noise first |
| Pressure will not hold after adjusting | Replace it | Worn internals can no longer regulate |
| No PRV but pressure is 80+ psi | Add one | Protect the whole system from street pressure |
The cost of skipping it
What skipping it costs: sustained high pressure is a slow wrecking ball. It voids many water-heater warranties, batters faucet cartridges and toilet fill valves, and it is the classic cause of a burst washing-machine or toilet supply hose ($10-20 parts) whose failure floods a house, one of the most common large homeowner insurance claims at $5,000-70,000. Running past 80 psi also stresses the water heater's relief valve. A new PRV installed is $250-450, far less than one flooded floor. Confirm the problem first by learning how often to check home water pressure.
How to do it ($10 gauge to test · $250-450 to replace)
- Screw a $10-15 pressure gauge onto an outside hose bib or the laundry tap and read the static pressure.
- If it reads over 80 psi, try the PRV first: loosen the lock nut and turn the adjustment bolt counterclockwise to lower pressure.
- Retest after each small turn; aim to settle the house at 50-60 psi.
- If it will not come down or hold, shut the main, unthread the old PRV (union fittings make this far easier), and install the new one.
- Re-pressurize, set it to 50-60 psi, and on a closed system confirm there is a working thermal expansion tank.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing PRV replacements schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
How do I know if my PRV is failing?
The clearest sign is pressure that climbs past 80 psi and no longer responds to the adjustment screw. Other tells: water hammer or banging pipes when a faucet shuts, toilets that run or hiss, a water-heater relief valve that periodically drips, and pressure that swings wildly between day and night. Confirm with a gauge on a hose bib rather than guessing. If the reading is high and adjusting the bolt does nothing, the diaphragm inside has worn out and the valve needs replacing, not repair.
What pressure should my house actually be set to?
Aim for 50 to 60 psi, which is comfortable at the fixtures and easy on the plumbing. Code allows up to 80 psi as an absolute ceiling, but living near that limit accelerates wear on everything, from cartridges and hoses to the water heater. Below about 40 psi, showers and simultaneous fixtures feel weak. Setting the PRV in the 50-60 range is the sweet spot, so after any adjustment or replacement, verify it with a gauge rather than eyeballing the flow.
Can I replace a PRV myself?
It is a moderate DIY job if the valve has union fittings and you are comfortable shutting the main and sweating or threading a connection. The part alone is roughly $150-250, versus $250-450 for a plumber to supply and install. The catches: some PRVs are soldered inline with no unions, which is much harder, and if you have a closed system you also need a working thermal expansion tank. If any of that is unfamiliar, the plumber's rate is money well spent.
Does a PRV mean I also need an expansion tank?
On a closed plumbing system, yes. A PRV (and many modern meters with a check valve) blocks water from flowing back into the city main, so when the water heater warms up and the water expands, it has nowhere to go and pressure spikes. A thermal expansion tank gives that expansion a cushion. If you have a PRV and no expansion tank and see the relief valve on the water heater weeping, that is the missing piece, and it should be added.