Yes, you can increase water pressure, but the method depends on what is causing it to be low
Low water pressure usually comes from one of three sources: a problem at the meter or main line (which you cannot fix yourself), a clogged or undersized pipe inside your house (which you can), or a pressure regulator set too low (which you can adjust). Before you call a plumber, check whether the problem is everywhere in the house or only at certain fixtures — that tells you which fix will work.
If low pressure is only at one sink or shower, the issue is almost always a clogged aerator or showerhead. If it is everywhere, you are dealing with either a regulator adjustment, mineral buildup in your main line, or a problem with your water supply itself. A few of these fixes cost nothing. Others require a plumber and run between $300 and $1,500 depending on what needs replacing.
Key Takeaways
- Low pressure at a single fixture usually means the aerator or showerhead is clogged with mineral deposits, and unscrewing and cleaning it takes ten minutes.
- Low pressure everywhere in the house points to a pressure regulator that may be set below 50 psi, which you can adjust yourself if you have the right wrench.
- If your house has galvanized steel pipes and is more than 40 years old, mineral buildup inside the pipes may require replacing them, a job that costs $1,000 to $3,000.
- A water pressure gauge costs $10 to $20 and tells you whether your pressure is actually low or whether the problem is something else entirely.
- If pressure is low only when you use hot water, the issue is in your water heater, not your main line.
Check your water pressure with a gauge before you do anything else
A water pressure gauge screws onto any outdoor faucet or hose bib in under a minute. You can buy one at any hardware store for $10 to $20. Normal household water pressure is between 40 and 80 psi (pounds per square inch). If your gauge reads below 40 psi, you genuinely have low pressure. If it reads 50 psi or higher, the problem may be something else — a single clogged fixture, a water heater issue, or a perception problem.
Write down the reading and note whether it changes when you turn on other fixtures. If pressure drops sharply when you run the washing machine or shower, your main line may be undersized for your household's peak demand. If it stays steady, the problem is more likely a regulator or a single clogged fixture.
Clean the aerator or showerhead if pressure is low at only one fixture
An aerator is the small screen at the tip of a faucet. A showerhead is essentially the same thing. Both collect mineral deposits over time, especially in areas with hard water, and restrict flow. Unscrewing and cleaning one takes five minutes and costs nothing.
For a faucet aerator: unscrew it by hand or with a wrench, soak it in white vinegar for 30 minutes to an hour, scrub the screen with an old toothbrush, rinse it, and screw it back on. For a showerhead: unscrew it the same way, soak it in vinegar in a plastic bag (you can tie the bag around the showerhead if it is not removable), scrub, rinse, and reinstall. If the aerator or screen is corroded or damaged, replace it — they cost $3 to $15.
Adjust your pressure regulator if low pressure is everywhere in the house
Most homes have a pressure regulator near the water meter, usually on the main line where water enters the house. It looks like a brass cylinder about the size of a soda can, often with a screw or bolt on top. This device prevents pressure spikes that can damage pipes and appliances. If it is set too low, your whole house will have weak pressure.
You can adjust it yourself with a wrench if you are comfortable doing so. Locate the adjustment screw on top, turn it clockwise to increase pressure, and check your gauge after each quarter-turn. Increase pressure in small steps — do not jump from 30 psi to 80 psi at once. Stop when you reach 50 to 60 psi. If you are not confident, a plumber can do this in 15 minutes for $75 to $150.
If your house does not have a regulator and pressure is low, a plumber can install one. This usually costs $300 to $500 but is necessary if your municipal water pressure is very high and you want to protect your pipes.
Replace galvanized steel pipes if your house is old and pressure is low everywhere
Galvanized steel pipes, common in houses built before 1980, corrode from the inside over decades. Mineral buildup narrows the pipe opening and reduces pressure throughout the house. This is not something you can fix with an adjustment or cleaning — the pipes themselves have to be replaced.
Replacing all the galvanized pipes in a house is a major job. It typically costs $1,000 to $3,000 for a small house and more for larger ones, depending on how many pipes need replacing and how accessible they are. Some plumbers will replace only the main line and the most-used branches, which costs less but does not solve the problem everywhere. Before you commit to this, have a plumber inspect your pipes to confirm that buildup is the issue.
Check your water heater if pressure is low only for hot water
If cold water pressure is normal but hot water pressure is weak, the problem is in your water heater, not your main line. The most common cause is mineral buildup inside the tank, which narrows the outlet. Flushing the tank can help, though the fix is temporary if you have hard water.
To flush a water heater: turn off the power (for electric) or gas (for gas), let it cool, attach a garden hose to the drain valve at the bottom, run the hose to a drain or outside, open the valve, and let water run until it runs clear. This takes 30 minutes to an hour. If flushing does not restore pressure, the tank may need replacing, which costs $800 to $1,500 installed.
Install a pressure booster pump if you need higher pressure than your supply allows
If your municipal water pressure is genuinely low (below 40 psi) and adjusting the regulator or cleaning aerators does not help, a pressure booster pump can increase flow. These pumps sit on your main line and use a small motor to push water through your house at higher pressure. They cost $300 to $800 installed and use a small amount of electricity.
Booster pumps are most useful in rural areas with low municipal pressure or in houses on hills where gravity reduces pressure. They are less common in cities where municipal pressure is usually adequate. A plumber can assess whether one would help in your situation and install it if needed.
Frequently Asked Questions
How much does it cost to fix low water pressure?
Cleaning an aerator costs nothing. Adjusting a regulator costs $75 to $150 if a plumber does it. Installing a new regulator costs $300 to $500. Replacing galvanized pipes costs $1,000 to $3,000. A pressure booster pump costs $300 to $800 installed. Start with the free and cheap fixes — cleaning aerators and checking the regulator — before paying for major work.
Can low water pressure damage my pipes or appliances?
Low pressure itself does not damage pipes. High pressure does. If your pressure is below 40 psi, it may mean your water supply is weak, but it will not harm anything. However, if you install a booster pump and raise pressure above 80 psi without a regulator, that can damage pipes, water heaters, and washing machines over time.
Why is my water pressure low only in the morning?
Low pressure in the morning often means your municipal water system is under heavy demand before work hours. Pressure usually rises later in the day. If it happens every morning and never improves, the problem is more likely a regulator set too low or a clogged main line. Check your pressure gauge at different times to see the pattern.
Does a water softener help with low pressure?
A water softener does not increase pressure, but it can prevent future mineral buildup that would reduce pressure over time. If you already have low pressure from existing buildup, a softener will not fix it. It may help if you install a booster pump or replace pipes — it will keep the new system cleaner longer.
What if my landlord will not fix low water pressure?
In most places, landlords are required to provide water pressure adequate for normal use. Contact your local housing authority or tenant rights organization to learn what the standard is in your area and what steps you can take if the landlord does not respond to a written request.