Pressure Reducing Valves: Protecting Your Home From the Inside Out

High water pressure is one of the most common — and most overlooked — threats to your home’s plumbing system. A pressure reducing valve keeps your pressure at a safe level and prevents the kind of damage that leads to expensive repairs.

PRV BASICS

What Is a Pressure Reducing Valve?

Municipal water systems push water through miles of underground pipes to reach your home — and to make that journey, the pressure has to be high. The water entering many Highlands Ranch and South Denver homes arrives at 80, 100, or even 150 psi. That kind of pressure is great for fire hydrants, but it’s far too much for the pipes, fixtures, and appliances inside your home.

A pressure reducing valve (PRV) installs on your main water line, usually near where it enters the house, and automatically reduces incoming pressure to a safe, consistent level — typically around 60 psi. Think of it as a gatekeeper that protects everything downstream: your water heater, your washing machine connections, your toilet fill valves, your faucets, and every joint and fitting in between.

Without a functioning PRV, your plumbing system is under constant strain. The damage doesn’t happen all at once — it happens gradually, silently shortening the life of every fixture in your home until something finally fails. And when a pressurized fitting fails, it can flood your home in minutes.

120+ 

Street Pressure (PSI)

Too High for Home

Your PRV reduces dangerously high street pressure to a safe 60 psi before it reaches a single fixture in your home.

60

After PRV (PSI)

Safe for Home

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IMPORTANCE OF THE PRV

Comprehensive Pressure Reducing Valve Services

  • Prevents Catastrophic Flooding
  • Extends the Life of Every Fixture
  • Reduces Water Waste
  • Protects Your Water Heater
  • Eliminates Water Hammer
  • Required by Code in Many Areas

WARNING SIGNS

Signs Your Pressure Reducing Valve Is Failing

PRVs don’t last forever. When yours starts to fail, your plumbing will let you know. Watch for these symptoms.

Water Hammer (Banging Pipes)

A loud bang or thud when you turn off a faucet or an appliance shuts off is called water hammer. When a PRV fails in the open position, it allows high-pressure surges through your pipes. The sudden stop of fast-moving water creates a shockwave that slams through your plumbing — and you hear it as a bang. Left unaddressed, water hammer can loosen joints and damage fittings.

Low Water Pressure Throughout the House

A PRV can also fail in the closed or restricted position, dramatically reducing water pressure to your entire home. If every fixture has weak flow — not just one faucet — the PRV is the most likely culprit. You may also notice you can’t run two fixtures at the same time without one losing pressure.

Uneven Pressure Between Fixtures

If the kitchen faucet has strong flow but the upstairs bathroom is barely a trickle — or vice versa — a failing PRV may not be regulating evenly. Internal components wear unevenly and can create erratic pressure distribution throughout the house.

Fluctuating Pressure

If your water pressure randomly changes throughout the day — strong one moment, weak the next — the PRV’s internal spring or diaphragm may be wearing out. Pressure should remain consistent at every fixture. Fluctuations are a clear sign the valve is no longer doing its job.

Noisy or Humming Pipes

A high-pitched whine, humming, or vibration in your pipes — especially when water is running — can indicate a PRV that’s partially obstructed or failing. Sediment buildup and mineral deposits from Colorado’s hard water can cause the valve to vibrate as water forces its way through a restricted opening.

Leaking From the PRV Itself

If you see water dripping or pooling around the valve body, it’s a definitive sign that the internal seals have failed. A leaking PRV should be replaced promptly — the leak will only get worse, and in the meantime the valve isn’t properly regulating pressure to your home.

Pressure Reducing Valve FAQ

A pressure reducing valve is a plumbing device installed on your main water line that reduces incoming municipal water pressure to a safe level for your home — typically around 60 psi. Without a PRV, street pressure can exceed 80 to 150 psi, which damages pipes, fixtures, water heaters, and appliance connections over time.

High water pressure causes toilets to run constantly, compression fittings and supply lines to fail and potentially flood your home, faucets to drip, water hammer (banging pipes), premature wear on water heaters and appliances, and significantly reduced lifespan for all plumbing fixtures. It’s one of the most common — and most preventable — causes of plumbing failure in residential homes.

Common signs of a failing PRV include banging or hammering pipes, noticeably low water pressure throughout the house, uneven pressure between fixtures, fluctuating pressure that changes without explanation, dripping faucets, humming pipes, and toilets that run intermittently. If you’re experiencing any of these symptoms, have your PRV tested by a licensed plumber — it’s a quick test with a pressure gauge.

A pressure reducing valve typically lasts 7 to 12 years, depending on water quality and usage. Hard water and sediment — common in the Highlands Ranch and South Denver area — can shorten a PRV’s lifespan. We recommend having your PRV tested during routine plumbing inspections and replacing it proactively before it fails completely and leaves your home unprotected.

Most plumbing professionals and local water districts recommend residential water pressure between 50 and 70 psi, with 60 psi being the ideal target. Anything above 80 psi is considered too high and puts your plumbing system at risk of damage. You can test your pressure with an inexpensive gauge from a hardware store that threads onto a hose bibb — or we can test it during a service visit.

While high pressure alone may not burst a healthy pipe, it accelerates wear on joints, fittings, and older pipes — making them far more likely to fail. High pressure is especially dangerous for compression fittings, braided supply lines, and solder joints, which can blow under sustained excessive pressure. When these fail, they can flood your home within minutes. A properly functioning PRV eliminates this risk.

Concerned About Your Water Pressure?

Schedule with Southside Plumbing today.