Start with the simplest fixes first
Low shower pressure usually comes from one of three places: a clogged showerhead, a closed valve, or a problem with your home's main water supply. Before you call a plumber, check whether the issue is only in your shower or everywhere in the house. Run water from a sink faucet in the same bathroom. If that pressure is normal, the problem is isolated to your shower line. If pressure is low throughout the house, skip ahead to the section on main shutoff valves and supply issues.
The fastest fix is often the cheapest one. A showerhead clogged with mineral deposits can feel like a pressure problem when it is really just a blockage. Cleaning or replacing it takes minutes and costs nothing to a few dollars.
Key Takeaways
- Check whether low pressure is only in your shower or throughout the house, because the cause and fix are different for each.
- A clogged showerhead from mineral buildup is the most common cause and can be cleaned by soaking in vinegar or replaced for under ten dollars.
- A partially closed valve on the shower line itself or on your home's main water supply can cut pressure without shutting water off completely.
- If cleaning the showerhead and checking valves does not restore pressure, the problem is likely in your home's supply line or water meter, and you should call a plumber.
Clean or replace a clogged showerhead
Mineral deposits from hard water build up inside showerhead holes over time, narrowing the openings and reducing flow. You can see this as white or tan crusty buildup on the showerhead face or around the holes.
To clean it, unscrew the showerhead by hand (turn counterclockwise). Fill a bowl or cup with white vinegar and submerge the showerhead for one to two hours. Use an old toothbrush to scrub away the deposits, then use a thin object like a straightened paperclip or needle to poke out any remaining mineral inside each hole. Rinse thoroughly and screw it back on. Run water for a few seconds to flush out loose debris.
If cleaning does not restore pressure or the showerhead is damaged, replacement is inexpensive. A basic showerhead costs two to eight dollars at any hardware store. Unscrew the old one, wrap the threads of the new one with plumber's tape (also called thread seal tape) to prevent leaks, and screw it on hand-tight. Do not use a wrench unless you cannot tighten it by hand—over-tightening can crack the fitting.
Check the shower valve for partial blockage
Behind your shower wall is a valve that controls water flow to the showerhead. If this valve is partially closed, pressure will drop even though water is reaching the line. This valve has a handle you can access—either the knob or lever you use to turn the shower on and off, or sometimes a separate adjustment screw.
Turn the handle or knob all the way to the fully open position. If you have a screw-type adjustment (often found on older valves), turn it counterclockwise until it stops, then back it off one-quarter turn. Do not force it. If the valve is stuck or will not turn, do not explore excessive force—call a plumber, because forcing a stuck valve can break it inside the wall.
Some shower valves have a pressure-balancing cartridge inside that can become partially blocked by debris. If pressure is still low after opening the valve fully, and the showerhead is clean, the cartridge may need replacement. This is a job for a plumber, because the cartridge sits inside the wall valve and requires special tools to access.
Check your home's main water shutoff valve
Your home has a main shutoff valve where water enters from the street. This valve controls water to your entire house. If it is partially closed, pressure will be low everywhere, including your shower.
Locate your main shutoff valve. It is usually in the basement, crawlspace, or utility room near where the water line enters the house. It may also be outside in a box at ground level near the street. The valve handle is either a lever (turn it perpendicular to the pipe to close, parallel to open) or a round knob (turn counterclockwise to open).
Make sure the handle is in the fully open position. If you find it partially closed, open it slowly and check your shower pressure. If pressure improves, someone may have partially closed it by accident. If the valve is stuck or will not turn, do not force it—call a plumber to avoid damaging the valve.
Look for leaks in visible supply lines
If pressure is low only in your shower and the showerhead is clean, water may be leaking from the supply line behind the wall or under the floor. You cannot see most of this line, but you can sometimes spot signs of a problem.
Check under the sink in the bathroom below or adjacent to your shower. Look for water stains, soft spots in the ceiling, or active dripping. Check your basement or crawlspace directly below the shower for wet spots on the floor or walls. If you see any of these signs, there is likely a leak in the supply line, and you need a plumber to locate and repair it.
A leak in the line reduces the water pressure reaching your showerhead because some water is escaping before it gets there. The longer the leak goes unrepaired, the more water and money you waste, and the greater the risk of mold or structural damage.
Understand when to call a plumber
Call a plumber if cleaning the showerhead, opening the shower valve fully, and opening the main shutoff valve do not restore pressure. You should also call if you suspect a leak in the supply line, if the valve is stuck or damaged, or if pressure is low throughout your entire house and the main shutoff valve is already fully open.
A plumber can use a pressure gauge to measure the actual water pressure entering your home. Normal household pressure is between 40 and 80 pounds per square inch (psi). If your pressure is below 40 psi, the problem may be with the water meter, the main line from the street, or your water supplier. The plumber can determine which and advise you on next steps.
If low pressure is a new problem that started suddenly, it is more likely to be a leak or valve issue. If pressure has always been low, the problem may be with your water meter or supply line, and your water supplier should be notified so they can check their side of the connection.
Prevent future pressure problems
Clean your showerhead every six months if you have hard water, or once a year if you have soft water. This prevents mineral buildup from reducing flow over time. You can also install a whole-house water softener if hard water is a persistent problem, though this is a larger investment.
Check your main shutoff valve once a year to make sure it moves freely and is in the fully open position. Turn it slowly—do not jerk it. If it is stuck, call a plumber to have it serviced before it becomes a problem during an emergency.
If you notice pressure dropping gradually over weeks or months, address it sooner rather than later. Gradual pressure loss often signals a slow leak or mineral accumulation, and catching it early prevents bigger problems.
Frequently Asked Questions
Why is my shower pressure low but my sink pressure is normal?
The problem is isolated to your shower line. Start by cleaning the showerhead and checking whether the shower valve is fully open. If pressure is still low, the supply line to your shower may have a leak or blockage inside the wall, and you need a plumber to investigate.
Can I fix low pressure by adjusting the temperature knob?
No. The temperature knob controls the mix of hot and cold water, not the pressure. If pressure drops when you adjust temperature, the problem is likely a stuck or partially closed valve, and you should check that the valve handle is in the fully open position.
What if only the hot water pressure is low?
The problem is in your hot water line, not your cold water line. Check whether low pressure is also happening at other hot water faucets in your home. If it is, the issue may be with your water heater or the hot water supply line. If it is only in the shower, the shower valve or supply line to the shower may be the problem. Call a plumber to diagnose.
Is low water pressure a sign of a serious problem?
Not always. A clogged showerhead is the most common cause and is harmless. However, if low pressure is new and sudden, or if you see signs of water damage or leaking, call a plumber. A leak in the supply line wastes water and can damage your home if left unrepaired.
Can I increase my water pressure myself?
You can restore normal pressure by cleaning the showerhead and opening any partially closed valves. You cannot increase pressure beyond what your water supplier provides. If pressure is low throughout your home and all valves are open, your water supplier may be able to adjust the pressure at the meter, but this is rare and requires their involvement.