Why your water pressure might be too high

High water pressure—anything above 80 pounds per square inch (psi)—can damage fixtures, waste water, and shorten the life of your appliances. Most homes work best between 40 and 60 psi. If your water comes from a municipal supply, the pressure entering your home is set by the city or county, and it's often higher than necessary for household use. If you have a well, a pressure tank that's lost its air charge or a malfunctioning regulator can push pressure too high.

You can check your pressure with an inexpensive pressure gauge, available at any hardware store. Screw it onto an outdoor faucet or a laundry sink connection, turn the valve fully open, and read the number. If it's consistently above 80 psi, lowering it will reduce wear on your pipes, fittings, and water heater.

Key Takeaways

  • A pressure-reducing valve installed where water enters your home is the most common and effective way to lower water pressure from a municipal supply.
  • You can test your current pressure with a straightforward gauge screwed onto any outdoor faucet, and pressure above 80 psi is considered high.
  • If you have a well system, the problem is usually a waterlogged pressure tank or a failed regulator, both of which require professional service.
  • A pressure-reducing valve costs between $50 and $150 for the part itself, but installation by a plumber is recommended if you're not comfortable working with your main water line.

Installing a pressure-reducing valve on a municipal water line

A pressure-reducing valve (PRV) is a spring-loaded device that sits on your main water line, usually near where water enters your home from the street. It automatically restricts flow to bring pressure down to whatever level you set—typically 50 to 60 psi. Most homes with municipal water have one already, but if yours doesn't, or if the existing valve has failed, a new one is the standard fix.

The valve itself costs $50 to $150 depending on the brand and size. Installation requires cutting into your main water line, soldering or using compression fittings, and mounting the valve in an accessible location. If you have plumbing experience and the right tools, you can do this yourself. If not, a plumber will charge $200 to $400 for the job, including the valve. Either way, the valve should have a small adjustment screw on top that lets you fine-tune the pressure after installation.

After installation, test the pressure again at an outdoor faucet. You may need to adjust the screw a few times to find the sweet spot—high enough that showers have decent flow, low enough that you stop hearing pipes bang when you turn off a faucet suddenly.

Adjusting an existing pressure-reducing valve

If you already have a PRV and your pressure is still too high, the valve may have drifted out of adjustment or developed an internal leak. Before replacing it, try adjusting the screw on top. Most valves have a locknut you'll need to loosen first, then turn the adjustment screw counterclockwise to lower the pressure. Turn it slowly—a quarter turn at a time—and test the pressure after each adjustment.

If adjusting doesn't work, the valve may be clogged with mineral deposits or debris. Turn off the main water supply, unscrew the small cap at the bottom of the valve (have a bucket ready), and flush out any sediment. Screw the cap back on, turn the water back on, and test again. If pressure is still high after cleaning and adjusting, the valve's internal spring or diaphragm has likely failed and the valve needs replacement.

Lowering pressure on a well system

If your water comes from a private well, the pressure is controlled by a pressure tank and a pressure switch, not a municipal regulator. High pressure on a well system usually means the pressure tank has lost its air charge—the tank contains both water and compressed air, and when the air leaks out, the system can't regulate pressure properly. You may also hear the pump running more often than usual.

To check the tank's air charge, turn off the pump and drain some water from the system using an outdoor faucet. Then use a tire pressure gauge on the air valve at the top of the tank (it looks like a car tire valve). The reading should be about 2 psi below your system's cut-in pressure—usually around 28 to 30 psi for a system set to 40 to 60 psi. If it reads zero or very low, the tank's bladder has failed and the tank needs replacement. This is a job for a well service professional.

If the air charge is correct, the problem may be a pressure switch that's stuck or a regulator valve that's failed. Both require professional diagnosis and repair.

When to call a plumber

Install a new pressure-reducing valve yourself only if you're comfortable soldering copper pipe or using compression fittings, and you know where your main water shutoff is. If you're unsure about any of these steps, call a plumber. The cost of a professional installation is worth avoiding a leak in your main line.

If you have a well system, any work on the pressure tank, pump, or pressure switch should be done by a licensed well service technician. These systems are pressurized and contain both water and air—mistakes can be dangerous and expensive. If you've installed or adjusted a PRV and pressure is still above 80 psi, or if it fluctuates wildly, call a plumber to inspect the valve and the main line for leaks or blockages.

What happens if you ignore high water pressure

High pressure puts constant stress on pipes, solder joints, and rubber seals. Over time, this leads to pinhole leaks in copper pipe, failed connections at fixtures, and premature wear on water heaters and washing machines. You'll also use more water than necessary, which shows up on your bill.

Lowering pressure to 50 to 60 psi can extend the life of your plumbing by years and reduce water waste. The small investment in a pressure-reducing valve or a professional adjustment pays for itself through lower water bills and fewer emergency repairs.

Frequently Asked Questions

Can high water pressure cause my pipes to burst?

Not usually in a single moment, but sustained high pressure causes small leaks and joint failures over months or years. The damage is gradual—pinhole leaks in copper pipe, failed compression fittings, and cracks in rubber washers. Lowering pressure prevents this slow deterioration.

What if I lower the pressure too much and my shower is weak?

Start with 60 psi and test your showers and outdoor faucets. If flow is too low, turn the adjustment screw clockwise a quarter turn at a time until you find the balance. Most homes are comfortable between 50 and 70 psi.

Do I need a plumber to install a pressure-reducing valve?

Not necessarily, but you do need to be comfortable cutting and soldering or fitting your main water line, and you need to know where your shutoff is. If you've never done this work, hiring a plumber is safer and faster than learning on your main line.

Why does my pressure regulator keep failing?

Sediment and mineral buildup inside the valve can damage the internal spring and diaphragm. If your water is hard or your pipes are old, flush the valve regularly and consider replacing it every 10 to 15 years as preventive maintenance.

Can I lower water pressure without a pressure-reducing valve?

You can partially restrict flow by closing the main shutoff valve slightly, but this is not a permanent solution and makes it harder to shut off water in an emergency. A pressure-reducing valve is the proper fix.