Yes, you can improve water pressure with fixes ranging from straightforward cleaning to plumbing changes

Low water pressure usually comes from one of three sources: mineral buildup in aerators and showerheads, a partially closed valve somewhere in your line, or a leak between the street and your house. The first two you can fix yourself in under an hour. The third requires a plumber, but you can diagnose it before you call. Start by checking whether the problem is everywhere in your home or only at one fixture—that tells you exactly where to look.

Water pressure is measured in pounds per square inch, or PSI. Most homes receive 40 to 60 PSI from the municipal supply. Anything below 40 PSI will feel weak at the shower and slow at the sink. If your pressure dropped suddenly rather than being low all along, a valve or leak is the culprit. If it has always been low, mineral deposits or distance from the main line are more likely.

Key Takeaways

  • Clean the aerator on your faucet or the screen on your showerhead first—mineral buildup is the most common cause and takes five minutes to fix.
  • Check the main shut-off valve and any isolation valves under sinks to make sure they are fully open, since a partially closed valve cuts pressure throughout that line.
  • If pressure is low at only one fixture, the problem is local to that fixture; if it is low everywhere, the issue is in the main line or supply.
  • A sudden drop in pressure across the whole house suggests a leak between your meter and your home, which requires a plumber to locate and repair.
  • If cleaning and valve checks do not help, a pressure regulator may be set too low, or you may need a booster pump if your home is far from the main line.

Clean the aerator or showerhead screen

The aerator is the small screen at the tip of your faucet. The showerhead has a similar screen. Both collect mineral deposits over time, especially in areas with hard water, and these deposits restrict flow. This is the first and easiest thing to check.

Unscrew the aerator by hand or with a wrench if it is tight. Rinse it under warm water and use an old toothbrush to scrub away any white or tan buildup. If the buildup is heavy, soak the aerator in white vinegar for 30 minutes, then scrub again. Rinse thoroughly and screw it back on. Do the same for your showerhead—most unscrew by hand from the shower arm. Test the pressure when ready after reinstalling.

If you see sediment or debris in the aerator itself, your water line may have a larger problem downstream. Note this and mention it to a plumber if you end up calling one.

Check that all valves are fully open

Every sink has an isolation valve underneath—a small knob or lever on the hot and cold lines. The main shut-off valve for your whole house is usually in the basement, crawl space, or near the water meter. If any of these are partially closed, they will reduce pressure on that line or throughout the house.

Turn each isolation valve counterclockwise until it stops—do not force it. If it is a lever handle, it should point in line with the pipe when fully open. If it is a round knob, turn it all the way left. Check the main shut-off valve the same way. If a valve is stiff, do not break it; call a plumber to have it serviced. After opening any valve, wait a minute and test your pressure again.

If you find a valve that was partially closed and you open it, the pressure should improve when ready. If it does not, move on to the next step.

Identify whether the problem is at one fixture or everywhere

Turn on the kitchen sink, then the bathroom sink, then the shower. Is the pressure low at all three, or only at one or two? This tells you where the problem lives.

If pressure is low at only one fixture, the aerator or valve at that fixture is the issue—go back and clean the aerator more thoroughly, or check whether that fixture has its own shut-off valve that is partially closed. If pressure is low everywhere in the house, the problem is in the main line or the pressure regulator. If pressure is low in only the hot water, the issue is in your water heater or the hot water line, not the main supply.

Check for leaks in the main line

If pressure dropped suddenly across the whole house and cleaning aerators and opening valves did not help, you may have a leak between your meter and your home. Look for wet spots in the basement, crawl space, or yard. Listen near the meter for a hissing sound. Check your water meter reading, wait two hours without using water, and check again—if it has moved, water is leaking somewhere.

A leak in the main line requires a plumber to locate and repair. Call a licensed plumber and describe what you have already checked. They can use a pressure gauge to confirm the leak and pinpoint its location. Do not delay on this—a leak wastes water and can damage your foundation.

Adjust or replace the pressure regulator

Many homes have a pressure regulator—a bell-shaped device on the main line just after the meter. It keeps incoming pressure from damaging your pipes. If it is set too low, your whole house will have weak pressure. If it is broken, pressure may be erratic.

A pressure regulator has a bolt on top. You can test the current pressure with a cheap pressure gauge (available at any hardware store for under $15). Attach it to an outdoor faucet or a test port on the regulator itself. If the reading is below 40 PSI, the regulator may need adjustment. Turning the bolt clockwise increases pressure; counterclockwise decreases it. Make small quarter-turn adjustments and test after each one. If the regulator is old or adjustment does not help, it may need replacement—this is a job for a plumber.

Install a booster pump if your home is far from the main line

If your home is at the end of a long line from the municipal main, or if you are on a hill above the main line, pressure may be naturally low even though nothing is broken. A booster pump can increase pressure by 20 to 40 PSI. These are installed on the main line after the meter and regulator.

Booster pumps range from $300 to $800 installed, depending on size and your plumber's rates. They require electricity and occasional maintenance. Before investing in one, have a plumber confirm that low pressure is due to distance or elevation, not a leak or regulator problem. A booster pump is a permanent solution but not the first thing to try.

Frequently Asked Questions

Why is my water pressure low only in the morning?

Morning pressure dips often happen because the whole neighborhood is using water at the same time. If pressure returns to normal by mid-morning, this is normal and not a problem with your home. If it stays low all day, the issue is in your line or fixtures.

Can I increase pressure by adjusting my water heater?

No. Your water heater does not control incoming pressure. If only hot water is weak, the problem is in the hot water line, the heater's inlet valve, or sediment inside the heater. A plumber can check the inlet valve and flush the heater if needed.

What PSI should my home have?

Most homes should have 40 to 60 PSI. Anything below 40 feels noticeably weak. Above 80 can damage pipes and appliances over time. If your pressure is consistently above 80, a regulator adjustment or replacement is needed.

Will cleaning my aerator really make a difference?

Yes. Mineral buildup is the single most common cause of low pressure at one fixture. Cleaning takes five minutes and costs nothing. If you have hard water, plan to clean aerators and showerheads once or twice a year.

Do I need a plumber to check for leaks?

You can do a basic check yourself by reading your meter before and after two hours of no water use. If the meter moves, a leak exists. A plumber has equipment to find exactly where it is and repair it. Do not wait on this—leaks waste water and money.