PRV Replacement

A pressure reducing valve (PRV) — sometimes called a pressure regulator — is a bell-shaped brass valve installed on the main water line where water enters your home. The utility often delivers water at far higher pressure than your house should ever see; the PRV steps that pressure down and holds it at a safe, steady level. When it wears out, that protection disappears, and pressure can spike, sag, or swing back and forth — quietly stressing every pipe, fixture, and appliance in the house.

If your water pressure has changed, or you've started hearing your plumbing where you never did before, the PRV is one of the first things worth checking — and replacing a failing one protects equipment that costs far more to repair.

Signs your PRV is failing

A PRV rarely fails all at once. More often you'll notice a handful of these symptoms creep in over time:

• Water hammer — a loud bang or thud in the walls when a faucet, toilet, or appliance valve shuts off.
• Banging, knocking, or vibrating pipes, especially when water starts or stops flowing.
• Water pressure that's too high (blasting faucets, showers that sting), too low (weak flow at fixtures), or that fluctuates up and down for no clear reason.
• Running toilets and toilets that refill on their own — high pressure forces water past the fill valve.
• Dripping faucets you can't fully shut off, or new drips appearing across multiple fixtures.
• A relief valve on the water heater or expansion tank that periodically weeps or discharges.
• Short appliance life — water heaters, dishwashers, washing machines, ice makers, and supply hoses failing earlier than they should.
• Leaks that keep coming back even after a fixture or supply line has been repaired.

Why high water pressure is a problem

It's tempting to think more pressure is better — until you see what it does to a home over time. High pressure puts constant strain on everything water touches: it loosens pipe joints and solder, blows out the rubber seals and washers inside faucets and valves, stresses the tank and components of your water heater, and shortens the life of dishwashers, washing machines, and ice makers. The thin braided supply lines behind toilets, sinks, and washers are a frequent failure point — and a burst one can flood a home in minutes.

For that reason, plumbing codes generally call for household water pressure to stay below 80 psi, and most homes are happiest in the 50–70 psi range. The PRV is the single device responsible for keeping you there. When it stops regulating, your home can sit at pressures well above the safe limit without anyone realizing it.

What causes PRVs to fail

PRVs are wear parts — they have moving internals under constant pressure, so failure is a matter of when, not if. The usual causes:

• A worn diaphragm or spring. The rubber diaphragm and spring inside the valve do the actual regulating. Over years of flexing they fatigue and lose their ability to hold a set pressure.
• Sediment and debris. Mineral scale, grit, and pipe debris can collect inside the valve and keep it from sealing properly — a real issue with Central Texas's hard, mineral-heavy water.
• Age. Most PRVs last roughly 7–12 years. If yours is older than that and pressure has started drifting, the valve itself is the likely cause.

How we diagnose it

Guessing at pressure problems wastes money. We confirm the cause before recommending anything:

• We measure your static water pressure with a gauge at an outdoor hose bib, so we know the real number coming into your home — not an estimate.
• We check whether the PRV is holding a steady, in-range pressure or letting it run high, drop low, or wander.
• We look for signs of thermal expansion — a closed system with a failing or missing expansion tank can push pressure up and make a PRV look like the problem when something else is going on.
• We inspect the valve and surrounding connections for leaks, corrosion, and sediment so the fix actually solves the problem the first time.

What replacement involves

If the gauge and inspection confirm the PRV has failed, replacement is usually a same-trip or quick follow-up job. We shut off the water at the main, remove the old valve, and install a new, correctly sized regulator, then set it to a safe target pressure and verify the reading on the gauge before we leave. Where appropriate, we'll also point out related issues — like a waterlogged or missing thermal expansion tank — that can undo a new PRV if they're left unaddressed, so your fix lasts.

Honest, flat-rate pricing

Every visit starts with a flat $150 service call that covers the trip and a full diagnosis. If the PRV needs to be repaired or replaced, the parts and labor are quoted separately and approved by you first — we never start work without your okay, and we don't invent problems to pad a bill. We're a locally owned, licensed and insured company with 20+ years of experience, and our goal is to fix what's actually wrong. See the full price sheet for details.

Serving San Antonio & the Hill Country

We diagnose and replace PRVs throughout San Antonio, Boerne, Bulverde, Spring Branch, New Braunfels, and Canyon Lake. If a hard-water problem turns up while we're checking your pressure, we can also screen your water on-site — a quick hardness, TDS, and chlorine screening (not a certified drinking-water lab test) — and talk through whether a water softener or whole-house filtration would help.

Frequently asked questions

How do I know if I need a new pressure reducing valve?

Watch for water pressure that's too high, too low, or swinging up and down; banging or hammering pipes; faucets and toilets that keep running or dripping; a relief valve that periodically discharges; and appliances that wear out early. The only way to confirm it is to measure your static water pressure with a gauge — which we do on the service visit.

What water pressure is too high for a house?

Most plumbing codes call for household pressure to stay below 80 psi, and many homes are most comfortable in the 50–70 psi range. Anything consistently above 80 psi stresses pipes, fixtures, the water heater, and appliances. A properly set PRV is what keeps you in the safe range.

How long does a pressure reducing valve last?

PRVs are wear parts. Most last roughly 7–12 years before the internal diaphragm and spring wear out or sediment keeps them from sealing. Hard, mineral-heavy Central Texas water can shorten that lifespan, so an older valve is often the cause when pressure starts to drift.

How much does PRV replacement cost?

We charge a flat $150 service call that covers the trip and a full diagnosis. If the PRV needs to be repaired or replaced, the parts and labor are quoted separately and approved by you before any work is done.