Start by checking whether the problem is only in your shower
Low shower pressure can come from a problem inside your shower alone, or from a problem in your whole house's water supply. The fastest way to know is to turn on a sink faucet in the same bathroom—or in a different room—and see whether the water comes out at normal pressure. If other faucets work fine, the issue is in your shower line or showerhead. If water pressure is low everywhere in your house, you have a different problem that needs a plumber to check your main water valve or supply line.
This guide focuses on shower-only pressure problems, which you can often fix yourself in under an hour. If pressure is low throughout your house, contact a licensed plumber in your area.
Key Takeaways
- Test other faucets first to know whether low pressure is only in your shower or throughout your house.
- A clogged showerhead is the most common cause and takes five minutes to clean with vinegar and a toothbrush.
- The shut-off valve under your sink or behind your shower wall may be partially closed—turning it fully open can restore pressure when ready.
- Mineral buildup in old pipes or a failing pressure-balancing cartridge inside the valve requires either descaling or cartridge replacement by a plumber.
- Water-saving showerheads have built-in restrictors that limit flow; replacing them with an unrestricted model increases pressure.
Clean the showerhead first—it's the most common culprit
Mineral deposits and sediment clog showerheads more often than any other cause. Hard water leaves calcium and lime buildup that narrows the holes where water comes out. You can clean this yourself in minutes without tools.
Unscrew the showerhead by turning it counterclockwise by hand. If it is stuck, wrap a cloth around it and use a wrench, but do not force it. Fill a cup or bowl with white vinegar and soak the showerhead for 30 minutes to 2 hours, depending on how much buildup you see. Use an old toothbrush to scrub the face of the showerhead and poke a toothpick or needle through each hole to clear blockages. Rinse it under running water and screw it back on. Turn on the shower and check the pressure.
If pressure improves but is still low, soak it longer—overnight in vinegar works for heavy buildup. If pressure does not improve at all, move to the next step.
Check the shut-off valve behind or under your shower
Every shower has a shut-off valve that controls water flow to that line. If someone partially closed it, pressure will drop. The valve is usually located under the sink in the cabinet below, or behind the wall where the shower connects to the supply line. If it is behind the wall, you may see a small access panel or the valve may be visible in an adjacent closet or basement.
The valve handle should point in the same direction as the pipe (parallel to the water line). If the handle is perpendicular to the pipe, it is partially or fully closed. Turn the handle so it points the same direction as the pipe—this is the fully open position. Turn on the shower and check whether pressure returns to normal.
If you cannot find the valve or it is stuck, do not force it. A stuck valve can break and cause a leak. Call a plumber instead.
Look for a pressure-balancing cartridge that may have failed
Modern shower valves contain a pressure-balancing cartridge that keeps hot and cold water mixed at a safe temperature. Over time, mineral buildup inside this cartridge can restrict water flow. The cartridge sits inside the valve body behind your shower wall, so you cannot see it directly.
Signs of a failing cartridge include pressure that drops suddenly when someone else in the house uses hot water, or pressure that is low only when you use hot water. If you notice either pattern, the cartridge likely needs cleaning or replacement.
Cleaning a cartridge requires turning off the water to your house, removing the cartridge, and soaking it in vinegar for several hours, then flushing it with clean water. Replacement means buying a new cartridge (usually $20 to $60) and installing it in the valve. Both tasks are easier for a plumber, but a homeowner with basic plumbing knowledge can do either one. If you are not comfortable working inside your valve, call a plumber.
Check whether your showerhead has a flow restrictor
Many showerheads sold in the last 20 years have a built-in flow restrictor—a small disk or ring inside the showerhead that limits water flow to meet federal water-conservation standards. These restrictors reduce flow to 2.0 gallons per minute. If your showerhead has one and you want higher pressure, you can remove it or replace the showerhead with an unrestricted model.
To check for a restrictor, unscrew the showerhead and look inside. You may see a small plastic or rubber disk, or a ring-shaped piece. If you see one, you can remove it by hand or with tweezers. Screw the showerhead back on and test the pressure. Removing the restrictor will increase flow, but it will also increase your water bill and hot-water use.
If you prefer not to remove the restrictor, you can buy a high-flow showerhead (usually $15 to $40) that has no restrictor or a less restrictive design. Check the product description to confirm it is rated for higher flow.
Descale the shower line if buildup is severe
If your home has very hard water and the showerhead cleaning did not help, mineral buildup may be inside the pipes that feed your shower. This is more common in older homes with galvanized steel pipes. Descaling means running a chemical solution through the line to dissolve the buildup.
You can rent or buy a descaling kit from a hardware store, but the process involves shutting off water to your shower, connecting the kit to the line, and running the solution through for several hours. It is messy and requires some plumbing knowledge. Most homeowners hire a plumber for this job, which usually costs $150 to $400 depending on how much of the line needs treatment.
Before you pay for descaling, confirm that the problem is not something simpler. Make sure the shut-off valve is fully open, the showerhead is clean, and the restrictor (if any) has been removed. If pressure is still low after all three checks, descaling may be your next step.
When to call a plumber instead of fixing it yourself
Call a plumber if the shut-off valve is stuck or broken, if you cannot find the valve, if pressure is low throughout your entire house, or if you are not comfortable working inside your shower valve. You should also call a plumber if low pressure started suddenly after a repair or renovation—something may have been damaged or disconnected during the work.
A plumber can diagnose the problem in one visit and often fix it the same day. Costs vary by region and the complexity of the repair, but a service call and straightforward fix (like cartridge replacement) typically runs $150 to $300. More involved work like descaling or replacing supply lines costs more.
Frequently Asked Questions
Why is my shower pressure low only when the water is hot?
The pressure-balancing cartridge inside your valve may be failing, or mineral buildup may be blocking the hot-water side of the line. Try cleaning the showerhead first. If only hot water is weak, the problem is likely in the cartridge or the hot-water supply line, and a plumber should inspect it.
Can I remove the flow restrictor from my showerhead?
Yes. Look inside the showerhead for a small plastic or rubber disk and remove it by hand or with tweezers. This will increase water flow, but it will also increase your water and heating bills. Check your local water codes first—some areas require restrictors by law.
What if I cleaned the showerhead and the pressure is still low?
Check the shut-off valve next to make sure it is fully open. If the valve is open and pressure is still low, the problem is likely inside the shower valve or the supply line, and you should call a plumber to inspect it.
Is low shower pressure a sign of a bigger plumbing problem?
Not always. If pressure is low only in your shower, the problem is almost certainly in the showerhead, the shut-off valve, or the shower valve itself. If pressure is low throughout your house, you may have a problem with your main water supply or pressure regulator, and a plumber should check it.
How much does it cost to fix low shower pressure?
If you clean the showerhead yourself, it costs nothing. If you need a plumber, a service call and straightforward repair like cartridge replacement usually costs $150 to $300. Descaling or replacing supply lines costs more. Always ask for an estimate before work begins.