Yes, you can increase water pressure, but the fix depends on what's causing it to drop

Low water pressure usually comes from one of three places: a problem inside your home that you can fix yourself, a problem with your meter or main line that the water company handles, or a pressure regulator that's set too low. If pressure is low everywhere in the house, start by checking whether your water company is doing work in your area—call their customer service line to ask. If not, the issue is almost certainly your pressure regulator, a valve usually located where the main water line enters your home, often in the basement or crawl space. A plumber can adjust or replace it in an hour.

If pressure is low in only one room or one fixture, the problem is almost always a clogged aerator, a mineral buildup inside the pipe, or a partially closed shut-off valve. These you can often fix yourself without calling anyone.

Key Takeaways

  • Low pressure everywhere in the house usually means your pressure regulator needs adjustment, which a plumber can do in under an hour.
  • Low pressure in one fixture often comes from a clogged aerator or mineral buildup, both fixable without professional help.
  • Check with your water company first to confirm they are not doing maintenance work that is temporarily reducing pressure.
  • Water pressure regulators typically keep pressure between 40 and 80 pounds per square inch; most homes run best at 60 to 70.
  • If you have a well instead of city water, low pressure usually means a problem with the pump or tank, which requires a well specialist.

Locating and adjusting your pressure regulator

The pressure regulator is a bell-shaped or cylindrical valve bolted to the main water line as it enters your home. Look for it in the basement, crawl space, or utility room—it will be near where the water meter sits. If you cannot find it, check your home inspection report or call your water company to ask where it was installed.

The regulator has a screw on top or a bolt on the side. Before you touch anything, buy a water pressure gauge (they cost $10 to $20 at any hardware store) and screw it onto a hose bib or the washing machine inlet to measure your current pressure. Write down the number. If it is below 40 pounds per square inch, your regulator is set too low. If it is above 80, it is set too high and you should not adjust it yourself—call a plumber, because high pressure damages pipes and fixtures.

To raise pressure between 40 and 80, turn the adjustment screw clockwise a quarter turn, then check the gauge again. Wait a few seconds for the system to settle. Turn the screw in quarter-turn increments until you reach 60 to 70 pounds per square inch. Most homes work best in that range. Do not exceed 80, because sustained high pressure will shorten the life of your water heater, washing machine, and dishwasher.

Clearing a clogged aerator on a single faucet

If only one faucet has low pressure, unscrew the aerator—the small screen at the tip of the faucet—by turning it counterclockwise by hand. Rinse it under running water and look for white or tan mineral deposits. If you see buildup, soak the aerator in white vinegar for 30 minutes, then scrub it with an old toothbrush and rinse it thoroughly.

Screw the aerator back on and test the pressure. If it is still low, the clog is inside the faucet body itself, not in the aerator. In that case, you can repeat the vinegar soak with the aerator removed, letting vinegar run through the faucet for a minute or two. If that does not work, the faucet cartridge or valve seat needs professional cleaning or replacement.

Checking for mineral buildup in pipes

In areas with hard water, minerals can accumulate inside pipes over years and narrow the opening water flows through. This happens most often in older homes and shows up as low pressure in multiple fixtures but not everywhere. If you have low pressure only in the kitchen sink and the bathroom sink, but good pressure in the shower, mineral buildup in those supply lines is a likely cause.

You can try the same vinegar soak approach: turn off the shut-off valve under the sink, disconnect the supply line, and let vinegar soak through it for an hour. Reconnect and test. If pressure does not improve, the buildup is too thick to clear without replacing the pipe section, which is a job for a plumber. They can also install a water softener if hard water is a recurring problem in your area.

Making sure shut-off valves are fully open

Every fixture has a shut-off valve underneath or behind it. Check the valve under the sink, behind the toilet, or at the washing machine inlet. The handle should point in the same direction as the pipe—if it is perpendicular to the pipe, it is partially closed. Turn it to align with the pipe direction and test the pressure.

Also check the main shut-off valve where the water line enters your home. It should be fully open. If someone has partially closed it, opening it fully may restore pressure throughout the house.

What to do if you have a well instead of city water

Well systems have a pressure tank and a pump instead of a regulator. Low pressure usually means the pump is failing, the tank is waterlogged, or the check valve is stuck. These are not fixes you can do yourself—call a well specialist or pump contractor. They can test the tank pressure (it should be about 2 pounds per square inch below your system's cut-in pressure) and replace the pump or tank if needed.

If pressure drops suddenly and you hear the pump running constantly, the tank is likely waterlogged and needs draining. A well specialist can do this in an hour, and it usually costs $150 to $300.

When to call a plumber instead of adjusting yourself

Call a plumber if your pressure is above 80 pounds per square inch, if adjusting the regulator does not help, if pressure is low everywhere and you do not have a regulator, or if you cannot locate the regulator. Also call if you have a well system with low pressure—that is not a homeowner repair.

A plumber can diagnose the problem in 30 minutes to an hour. Regulator adjustment or replacement usually costs $150 to $300. If the problem is a clogged main line or a failed check valve, the cost will be higher, but a plumber can tell you the price before starting work.

Frequently Asked Questions

Can high water pressure damage my pipes?

Yes. Pressure above 80 pounds per square inch puts stress on joints, seals, and fixtures. Over time it can cause leaks in the walls, burst hoses, and premature failure of your water heater and appliances. If your gauge reads above 80, have a plumber check your regulator.

Will increasing water pressure increase my water bill?

Slightly, because higher pressure means water flows faster and you use more in the same amount of time. The increase is usually small—a few dollars a month—but it is real. Keeping pressure between 60 and 70 pounds per square inch balances comfort with efficiency.

What if my pressure regulator is broken?

A broken regulator cannot be adjusted and must be replaced. A plumber can install a new one in about an hour for $150 to $300 total. Until it is replaced, your pressure will either be too high or too low depending on how it failed.

Why is my water pressure low only in the morning?

This usually means the water company is doing maintenance work early in the day, or your neighborhood's demand is highest in the morning and the system cannot keep up. Call your water company to ask. If they are not doing work, low morning pressure is normal in many areas and usually improves by mid-morning.

Can I install a pressure booster pump myself?

A pressure booster pump is a last resort when the water company cannot provide adequate pressure and a regulator adjustment does not help. Installation requires plumbing work and electrical hookup, so hire a plumber. Booster pumps cost $800 to $2,000 installed and are rarely necessary in homes served by municipal water.