Overview
A pressure reducing valve sits where the water line enters the house and drops street pressure to a level fixtures can handle. Over years, the internal spring and diaphragm wear, and scale from hard water makes them stick. When it fails, pressure can climb well over 80 psi, which stresses every fitting, valve and appliance.
We screw a gauge onto a hose bib and read the number. If the regulator is not holding a steady pressure, we replace it and set the new one in a safe range. Since higher pressure affects the water heater too, we check whether an expansion tank is needed.
How we handle it
Read the pressure
Gauge test at an outdoor spigot.
Replace the valve
New regulator at the main, set in a safe range.
Check the heater
Expansion tank added if needed.
What it costs
Most regulator swaps are a set price. A regulator buried in the yard or boxed in a wall takes longer. Adding an expansion tank at the water heater is a small extra that we often recommend at the same time.
Good to know
- Buy a cheap hose bib pressure gauge and check pressure once a year.
- If your heater relief valve drips, check pressure before replacing the valve.
- Know where the regulator is, usually near the main shut-off.
Pressure across the northwest side varies with elevation. Lower lots near creeks can see noticeably higher pressure than homes up on the ridges.
Pressure regulator replacement questions
What is a good water pressure?
Most homes do well between 50 and 70 psi.
Can high pressure cause leaks?
Yes. It is one of the top reasons fittings and toilets fail early.
Can I adjust it myself?
Many regulators have an adjustment screw, but a failed one will not hold its setting.
Will lowering pressure weaken my shower?
Not noticeably at a normal setting. Most fixtures are designed for 50 to 70 psi.