High water pressure damages pipes and fixtures faster than normal pressure does

Water pressure above 80 pounds per square inch (psi) wears out washers, seals, and valve seats in your plumbing system. You'll notice it first in a showerhead that sprays unevenly, a toilet that runs constantly, or a washing machine that shuts off mid-cycle. Reducing pressure to 50–75 psi extends the life of your pipes, appliances, and fittings by years.

The fix depends on where the high pressure comes from. If your city's water line delivers pressure that's too high, you install a pressure regulator on the main line where water enters your home. If you have a well and pump system, the problem is usually in the tank or pump settings. Either way, the solution is straightforward and doesn't require replacing pipes.

Key Takeaways

  • Water pressure above 80 psi shortens the life of pipes, washers, and appliance valves; the target range is 50–75 psi.
  • A pressure regulator installed on your main water line (usually near the meter or where the line enters the house) reduces city water pressure to a safe level.
  • If you have a well system, high pressure comes from the pump or tank settings, not the city line, and requires different adjustments.
  • You can measure your current pressure with an inexpensive gauge ($10–20) that screws onto an outdoor faucet.
  • A pressure regulator costs $50–150 for the part and takes 30 minutes to an hour to install if you're comfortable with basic plumbing.

Measure your water pressure before making changes

Buy a water pressure gauge at any hardware store (they cost $10–20 and screw onto a standard outdoor faucet). Turn off all water use in the house—no showers, no laundry, no toilets running—then screw the gauge onto the lowest outdoor faucet you have. Turn the faucet on fully and read the number on the dial. That's your static pressure.

Write down the reading. If it's consistently above 80 psi, a regulator will help. If it's between 50 and 75 psi, your pressure is already in the safe range and you don't need to adjust anything. If it fluctuates wildly (jumping from 40 to 90 psi), the problem may be a faulty regulator that's already installed, or a waterlogged expansion tank on a well system.

Install a pressure regulator on your main water line

A pressure regulator is a brass or plastic valve about the size of a fist that screws onto your main water line. It has an adjustment screw on top. Water flows through it at whatever pressure you set; anything above that setting gets bled off harmlessly into a small drain line.

Locate your main water line where it enters the house—usually in the basement, crawlspace, or garage, near the water meter. The regulator goes on the house side of the meter (after the meter, not before). Turn off the main water valve, unscrew the fitting where you want to install it, and screw the regulator in place using two pipe wrenches (one to hold the fitting, one to turn the regulator). Wrap the threads with plumber's tape first to prevent leaks.

Once it's installed, turn the water back on slowly and check for leaks around the connection. Then adjust the screw on top of the regulator. Turn it clockwise to increase pressure, counterclockwise to decrease it. Make small quarter-turn adjustments and wait 30 seconds between each one, then check your gauge again. Stop when you reach 60–70 psi.

When to call a plumber for pressure regulator installation

If your main water line is soldered copper or uses compression fittings you've never worked with, or if you're not comfortable using two wrenches at once, hire a plumber. The job takes them 30 minutes to an hour and costs $150–300 for labor plus the regulator part. It's worth paying for if you'd rather not risk a leak behind a wall or in your foundation.

Also call a plumber if you can't locate your main water valve, if the valve is stuck or won't turn, or if you find the regulator is already installed but the pressure is still high. That last situation means the existing regulator is failing and needs replacement, which a plumber can diagnose quickly.

Adjust pressure on a well system with a pump and tank

If you have a private well, high pressure usually comes from the pump or the pressure tank (a metal tank that stores water under pressure). The tank has an air valve on top that looks like a tire valve on a car. The pressure inside the tank is what pushes water through your house.

First, measure the air pressure in the tank using a tire gauge (the same kind you'd use on a car). Turn off the pump, then press the gauge onto the air valve. If the reading is more than 2 psi below your water pressure, the tank is waterlogged and needs draining. Turn off the pump, open a faucet to release pressure, then open the drain valve at the bottom of the tank and let it empty completely. Close the drain, turn the pump back on, and check your pressure again.

If the tank is fine but pressure is still too high, the pump itself may be set too high. This requires adjusting the pressure switch on the pump, which has two bolts and two nuts. Turning the lower nut counterclockwise lowers the pressure at which the pump shuts off. Make quarter-turn adjustments and test between each one. If you're not comfortable with this, a well service technician can do it in 30 minutes for $75–150.

Check for a faulty regulator that's already installed

Some homes come with a pressure regulator already on the main line, but it fails silently. If your pressure gauge reads high and you find a regulator already in place, the regulator itself may be broken. The most common failure is a ruptured internal diaphragm, which means water flows through at full city pressure no matter what the adjustment screw says.

Test this by turning the adjustment screw all the way counterclockwise (the direction that should lower pressure the most). Wait a minute, then check your gauge. If the pressure doesn't drop at all, the regulator is failed and needs replacement. Unscrew the old one and screw a new one in its place using the same method described above. This takes 15 minutes and costs $50–100 for the part.

What happens after you reduce water pressure

Within a few days, you'll notice your shower feels softer and your toilet refills more slowly. This is normal. Your water use may drop slightly because less water flows out of each faucet per second, but the difference is usually small—most people don't notice a change in their water bill.

The real benefit shows up over years: your washing machine won't shut off mid-cycle, your toilet won't run constantly, and you won't hear pipes banging when you turn off a faucet. Fixtures last longer, and you avoid the cost of replacing a burst pipe inside a wall.

Frequently Asked Questions

Can high water pressure cause my pipes to burst?

Yes, especially if the pressure stays above 100 psi for months. Pipes fail slowly—a tiny leak develops, then grows—but the damage is real. Pressure above 80 psi also causes water hammer (loud banging when you shut off a faucet), which can crack fittings and seals. Reducing pressure to 60–70 psi prevents both problems.

Will lowering water pressure affect my shower or washing machine?

Your shower will feel softer but still rinse you clean. A washing machine may take a few seconds longer to fill, but it will work normally. Most people don't notice a meaningful difference in daily use. If you have low water pressure to begin with (below 40 psi), don't reduce it further.

What if I adjust the regulator and pressure goes back up?

The regulator may be stuck or failing. Turn the adjustment screw counterclockwise all the way, wait a minute, and check the gauge again. If pressure doesn't drop, the internal diaphragm is likely ruptured and the regulator needs replacement. If pressure does drop but then creeps back up over hours, sediment may be blocking the valve—flush it by opening the drain screw on the regulator for a few seconds.

Do I need a plumber to install a pressure regulator?

Not if you're comfortable with basic plumbing and have two pipe wrenches. The job is straightforward: turn off water, unscrew a fitting, screw in the regulator, turn water back on, and adjust. If you've never done it or your main line is soldered, hiring a plumber ($150–300) is worth the peace of mind and guarantees no leaks.

How often do I need to adjust the regulator?

Once you set it to 60–70 psi, you shouldn't need to touch it again unless you notice pressure creeping up over months. If you do, check the gauge first to confirm, then make a small adjustment. If pressure keeps rising after each adjustment, the regulator is failing and needs replacement.