Start with the shower head and aerator
The fastest fix for low shower pressure is cleaning or replacing the aerator—the screen inside the shower head where water comes out. Mineral buildup, rust, and debris collect there over time and restrict flow. You can often restore full pressure in five minutes with tools you already have.
Unscrew the shower head by hand (turn counterclockwise). If it is stuck, wrap the connection with a cloth and use a wrench or pliers to grip it without scratching the finish. Once it is off, look inside the opening and at the aerator screen itself. If you see white, chalky deposits or discoloration, that is mineral scale.
Soak the aerator in white vinegar for 30 minutes to an hour. Use an old toothbrush to scrub away the deposits, paying attention to the small holes. Rinse thoroughly under running water. Screw the head back on and test the pressure. If the aerator is cracked or still clogged after cleaning, buy a replacement aerator (they cost $3 to $8) and install it the same way.
Key Takeaways
- A clogged aerator or shower head screen is the most common cause of low pressure and can usually be fixed by soaking in vinegar and scrubbing with a brush.
- The shut-off valve under the sink or behind the wall controls water flow to the entire bathroom and may have been partially closed during repairs or maintenance.
- Pressure-limiting devices built into some shower heads intentionally reduce flow to save water, and removing or replacing the head will restore higher pressure.
- If pressure is low throughout your home, the issue is likely in the main water line or meter, and you should contact your water utility to check for leaks or pressure problems.
Check the shut-off valve under your sink
Every sink has a shut-off valve underneath it—usually two valves, one for hot water and one for cold. These valves control how much water flows to that sink. If someone turned one partially closed during a repair or by accident, it will reduce pressure to your shower.
Look under the sink in your bathroom. You will see two small knobs or handles on the pipes coming from the wall. Turn both of them all the way counterclockwise (lefty-loosey). They should spin freely and stop when fully open. If one is only halfway open, that is your problem.
After opening both valves fully, go back to the shower and test the pressure. If it improved, you have found the issue. If pressure is still low, move on to the next step.
Look for a pressure-limiting device in the shower head
Many shower heads sold in the last 20 years include a flow restrictor or pressure-limiting device inside them. These are designed to reduce water use and meet federal conservation standards. They work, but they also reduce the pressure you feel.
Unscrew your shower head again and look inside the opening where water enters. You may see a small plastic or metal insert—often a disc with a hole in the center, or a cartridge that looks like a small cylinder. This is the flow restrictor.
Remove it carefully (it may just pull out, or you may need to twist it). Rinse it and set it aside. Screw the head back on and test the pressure. You should feel a noticeable increase. If you want to keep the restrictor but still have higher pressure, you can buy a shower head without one built in (look for models labeled "high-flow" or "unrestricted," typically $15 to $40).
Check the main water shut-off valve
If pressure is low in your shower but also low everywhere else in your home—kitchen sink, toilet, outdoor hose—the problem is not in the shower itself. The issue is in your main water line or at your meter.
Locate your main shut-off valve. In most homes, it is in the basement near where the water line enters the house, or outside in a box at the street. The valve looks like a knob or lever on a large pipe. Turn it counterclockwise to open it fully (if it is a lever, it should point along the pipe, not across it).
If the valve was partially closed, opening it may restore pressure throughout your home. If pressure is still low everywhere, contact your water utility. Low pressure across the entire system usually means a problem with the main line, a leak somewhere in your home's plumbing, or an issue at the meter or street connection. The utility can check for leaks and pressure problems at no cost.
Replace the shower head if pressure is still low
If you have cleaned the aerator, opened all the shut-off valves, and removed any flow restrictor, but pressure is still weak, the shower head itself may be damaged or defective. Buy a replacement head rated for high flow (at least 2.5 gallons per minute, though many older homes can handle higher).
Unscrew the old head, wrap the threads with plumber's tape (also called Teflon tape) to prevent leaks, and screw on the new one by hand. Tighten it with a wrench if needed, but do not over-tighten or you may crack the fitting. Turn on the water and check for leaks at the connection. If you see drips, turn off the water, unscrew the head, add another layer of tape, and try again.
A basic high-flow shower head costs $10 to $25. If you want features like a rain setting or massage jets, expect to pay $30 to $60. Test the new head before leaving the store if you can, or check the return policy in case the pressure still does not meet your needs.
Inspect the mixing valve if you have low hot water pressure only
If your cold water pressure is normal but hot water pressure is weak, the problem is in the hot water line or the mixing valve that blends hot and cold water. This is different from a whole-shower pressure problem.
First, check the shut-off valve for hot water under the sink (the one on the left side of the pair). Open it fully as described earlier. If that does not help, the issue is likely inside the mixing valve itself or in the hot water line from your water heater.
Mixing valves can develop mineral buildup or internal damage over time. If you are comfortable with basic plumbing, you can try to clean it, but this often requires turning off water to the whole house and may need a plumber. Call a licensed plumber if you want to pursue this—they can diagnose whether the valve needs cleaning or replacement, which typically costs $150 to $300 in labor plus parts.
Frequently Asked Questions
Why did my shower pressure suddenly drop?
Sudden pressure loss usually means the aerator got clogged or a shut-off valve was accidentally turned partway closed. Less often, a pipe burst or the water utility had a main line break in your area. Start by cleaning the aerator and checking the shut-off valves under the sink. If those do not fix it and pressure is low everywhere in your home, call your water utility.
Can I remove the flow restrictor from my shower head permanently?
Yes. The flow restrictor is removable on most modern shower heads. Once you take it out, it stays out. Keep it in case you need to reinstall it later, but there is no harm in leaving it off if you prefer higher pressure. Some states have regulations about maximum flow rates, but most allow homeowners to modify their own fixtures.
Will a new shower head really make a difference?
Only if your current head is damaged, has a built-in restrictor you have not removed, or is very old. If you have already cleaned the aerator and removed any restrictor, a new head will not increase pressure further. The pressure you get depends on your water supply, not the head itself.
Is low water pressure a sign of a serious plumbing problem?
Not always. Low pressure in one shower usually means a clogged aerator or closed valve. Low pressure everywhere in your home could mean a leak, a problem at the meter, or an issue with the main line—call your water utility to check. If pressure drops suddenly after you hear a loud bang in the pipes, you may have a burst line, and you should turn off the main valve and call a plumber.
How much does it cost to fix low water pressure?
If the problem is a clogged aerator or closed valve, it costs nothing—you can fix it yourself in minutes. A replacement shower head costs $10 to $60. If a plumber needs to repair or replace a mixing valve or diagnose a problem in the main line, expect to pay $150 to $400 depending on what they find and your location.