Turn down water pressure at the main shutoff valve or pressure regulator

The fastest way to reduce water pressure is to adjust the main water shutoff valve where the water line enters your home. This valve has a handle or knob; turning it clockwise (to the right) restricts flow and lowers pressure. You will feel resistance as you turn — stop when the pressure feels right. This method works when ready but affects every fixture in your house.

If your home has a pressure regulator — a bell-shaped or cylindrical device usually mounted on the main water line near the shutoff valve — you can adjust it instead. A screw on top of the regulator controls the pressure setting. Turn the screw counterclockwise to lower pressure. Most regulators have a gauge showing the current pressure in pounds per square inch (PSI); aim for 40 to 60 PSI for household use. Turning the screw takes a few full rotations to make a noticeable difference.

If you do not see a regulator and your water pressure is consistently high (above 80 PSI), you may want to have a plumber install one. High pressure damages fixtures, wastes water, and shortens the life of appliances. A regulator costs between $100 and $300 installed and pays for itself in reduced repairs and lower water bills.

Key Takeaways

  • The main shutoff valve controls pressure for your entire home; turn the handle clockwise to reduce flow.
  • If you have a pressure regulator, turn the adjustment screw counterclockwise to lower the PSI reading.
  • Household water pressure should stay between 40 and 60 PSI; anything above 80 PSI can damage pipes and appliances.
  • Reducing pressure at the source is more effective than installing individual pressure-reducing valves on each fixture.

Locate your main shutoff valve and pressure regulator

The main shutoff valve is usually in the basement, crawlspace, or utility room where the water line enters the house from the street. Follow the water meter — the valve is typically within a few feet of it. In warm climates, it may be in a box buried in the yard or mounted on an exterior wall. The valve handle is either a wheel (turn it like a steering wheel) or a lever (turn it like a door handle).

The pressure regulator, if present, looks like a small metal bell or cylinder with a screw on top. It sits on the main water line just downstream of the shutoff valve. Not all homes have one; older homes and homes on municipal water systems with already-low pressure often do not. If you cannot find one, your water pressure is likely controlled by the city or county water department, and you may need to contact them about high pressure in your area.

Adjust the shutoff valve in small increments

Do not turn the main shutoff valve all the way closed — that will cut off water to your entire home. Instead, turn it slowly and stop every quarter turn to test the pressure at a sink or shower. You want to feel a noticeable reduction, not a trickle. Most people find the right setting between a quarter and half turn from fully open.

After you adjust the valve, wait a minute for the pressure to stabilize throughout the house. Then turn on a faucet upstairs and downstairs to check that pressure is even. If one area feels much weaker than another, the valve may not be the problem — you may have a leak or a clogged aerator instead.

Adjust a pressure regulator with the adjustment screw

Locate the adjustment screw on top of the regulator — it usually has a plastic cap or nut. Use an adjustable wrench or pliers to turn the screw counterclockwise (to the left). Each full turn lowers the pressure by roughly 10 to 15 PSI, though this varies by regulator model. Turn slowly and check the gauge after each half turn.

If the regulator does not have a gauge, turn on a faucet and adjust the screw until the pressure feels right. You can always turn it back if you go too far. If you cannot turn the screw — it is stuck or corroded — do not force it; call a plumber instead. Forcing a stuck screw can damage the regulator and cause a leak.

Install a pressure-reducing valve on individual fixtures

If you want to lower pressure only at certain fixtures — say, the shower or outdoor hose — you can install a pressure-reducing valve on that line instead of adjusting the main valve. These valves screw onto the supply line and cost $10 to $30. They are useful if high pressure bothers you only in one area or if you rent and cannot modify the main valve.

To install one, turn off the water at the shutoff valve, unscrew the old supply line, screw on the pressure-reducing valve, and reattach the supply line. Most valves come with instructions and require only a wrench. This method does not affect water pressure elsewhere in the house, so it is a good option if your overall pressure is fine but one fixture is too strong.

Check your water pressure before and after adjustment

You can measure water pressure with an inexpensive pressure gauge, which screws onto any outdoor faucet or hose bib. These cost $8 to $15 at hardware stores. Screw the gauge on, turn on the water, and read the PSI. Write down the number before you adjust anything so you know how much you have changed.

After adjustment, check the pressure again at the same faucet. Ideal household pressure is 40 to 60 PSI. Below 40 PSI, showers feel weak and dishwashers may not clean well. Above 80 PSI, you risk leaks in pipes and damage to water heaters, washing machines, and toilets. If your pressure is still too high after adjusting the main valve or regulator, contact your water provider — the problem may be on their side of the meter.

Frequently Asked Questions

Will lowering water pressure reduce my water bill?

Yes, slightly. Lower pressure means less water flows out of each faucet per minute, so you use less overall. The savings are modest — usually $5 to $15 per month — but they add up over time. The bigger benefit is avoiding damage to pipes and appliances, which costs far more to repair.

Can I adjust the pressure regulator myself, or do I need a plumber?

You can adjust it yourself if you have an adjustable wrench and the screw turns freely. If the screw is stuck, corroded, or you are unsure which direction to turn it, call a plumber. A service call costs $100 to $200, but it is cheaper than damaging the regulator or causing a leak.

What if I turn the main valve and nothing changes?

The valve may be stuck or partially blocked. Try turning it slowly back and forth a few times to loosen it, then try again. If it still does not work, the valve may need replacement. You can also check whether a pressure regulator is already installed — if one is, adjusting the main valve will not help.

Is low water pressure a sign of a leak?

Not always. Low pressure can mean a clogged aerator, a failing pressure regulator, or a problem with the municipal water supply. A leak usually shows up as wet spots in the yard or basement, higher water bills, or pressure that drops suddenly. If you suspect a leak, contact a plumber to locate it.

How often should I check my water pressure?

Check it once a year or whenever you notice a change in water flow. Pressure can shift with the seasons, changes in your neighborhood's water demand, or aging pipes. If pressure creeps back up after you adjust it, the regulator may be wearing out and need replacement.