Start with the simplest fixes first

Low shower pressure usually comes from one of three places: a clogged showerhead, a closed or partially closed valve, or sediment in the pipes. Before you call a plumber, check these three things in order. Most of the time, one of them solves the problem in under an hour.

The fastest fix is cleaning your showerhead. Mineral deposits from hard water build up inside the holes and restrict flow. Unscrew the showerhead from the arm, soak it in white vinegar for two to four hours, then use an old toothbrush to scrub the holes. Rinse it thoroughly and screw it back on. If pressure returns to normal, you are done.

If the showerhead was not the problem, check the shut-off valve under the sink or behind the wall where the water line enters your shower. It should be fully open — the handle should point in the same direction as the pipe. If it is perpendicular to the pipe, turn it to match. A partially closed valve cuts pressure significantly.

Key Takeaways

  • Clean your showerhead by soaking it in white vinegar and scrubbing the holes with a toothbrush, which removes mineral buildup that blocks water flow.
  • Check the shut-off valve under the sink or behind the wall — it should be fully open, with the handle pointing in the same direction as the pipe.
  • If only your shower has low pressure but other fixtures work normally, the problem is in the shower line itself, not your whole house supply.
  • Sediment in old pipes can restrict flow; flushing the line by opening the valve fully for 30 seconds may dislodge it.
  • If pressure is low everywhere in your house, contact your water company to check the main line before paying for a plumber visit.

Tell the difference between a shower problem and a house-wide problem

Before you spend money on repairs, determine whether low pressure is only in your shower or throughout your home. Turn on the kitchen sink, bathroom sink, and toilet fill valve. If those all have normal pressure, the problem is isolated to your shower line. If pressure is low everywhere, the issue is your main water supply or the line coming into your house.

If the problem is house-wide, call your water company first. Low pressure on the street side of your meter is their responsibility, not yours. They can check for main line breaks or pressure problems in the neighborhood at no cost. If they confirm pressure is normal at the meter, the problem is in your home's internal plumbing, and you will need a plumber.

Check for a clogged cartridge or mixing valve

If your showerhead is clean and the shut-off valve is open, the problem may be inside the wall. Most modern showers have a cartridge or mixing valve that controls temperature and flow. These can get clogged with sediment or mineral deposits.

To test this, turn off the shut-off valve, unscrew the showerhead, and turn the valve back on. If water flows freely from the pipe without the showerhead attached, the cartridge is likely clogged. You can try flushing it by turning the valve fully open for 30 seconds, then closing it again. If that does not work, the cartridge may need to be replaced — a plumber can do this in 30 minutes to an hour.

If water does not flow freely even without the showerhead, the problem is deeper in the line or in your main supply. At this point, a plumber's inspection is the next step.

Look for leaks or damage in visible pipes

Walk around your home and look at any exposed water pipes, especially near the shower. Check under sinks, in basements, and in crawl spaces. A small leak upstream of your shower can reduce pressure significantly, even if you do not see water pooling.

Look for water stains, corrosion, or pinhole leaks in copper or galvanized steel pipes. If you find a leak, turn off the main water shut-off valve when ready and call a plumber. Do not attempt to patch it yourself — temporary fixes often fail and cause water damage.

Understand when to call a plumber

Call a plumber if you have cleaned the showerhead, confirmed the shut-off valve is open, and pressure is still low. Also call if you see visible leaks, if pressure is low throughout your house, or if you suspect the cartridge is clogged and flushing did not help.

A plumber can use a pressure gauge to measure your water pressure at different points in the line. Normal household pressure is 40 to 60 pounds per square inch (PSI). If your pressure is below 40 PSI, the plumber can identify whether the problem is in the main line, the branch line to your shower, or the fixture itself. This diagnosis usually costs $100 to $200 and takes 30 to 45 minutes.

Prevent future pressure problems

Clean your showerhead every three to six months if you have hard water. This prevents mineral buildup from restricting flow over time. If you notice pressure dropping gradually, cleaning the showerhead early can stop the problem before it becomes severe.

If you have very hard water, consider installing a whole-house water softener or a point-of-use filter on your shower line. These reduce mineral deposits in pipes and fixtures. A water softener costs $500 to $2,500 installed, while a shower filter costs $30 to $100 and lasts six to twelve months.

Frequently Asked Questions

Why is my shower pressure low but my kitchen sink is normal?

The problem is in the shower line itself, not your main supply. The most common cause is a clogged showerhead or cartridge. Clean the showerhead first. If that does not work, the cartridge inside the wall may need flushing or replacement by a plumber.

Can I fix low water pressure without turning off the main valve?

You can clean the showerhead and check the shut-off valve without touching the main. If you need to work on the cartridge or pipes, you must turn off the water first to avoid flooding. The main shut-off is usually near the water meter or where the line enters your house.

How long does it take a plumber to fix low shower pressure?

If the problem is a clogged cartridge, 30 to 60 minutes. If the plumber must replace the cartridge or repair a leak, add another 30 to 60 minutes. A diagnostic visit to measure pressure and identify the problem usually takes 30 to 45 minutes and costs $100 to $200.

Will a new showerhead increase my water pressure?

A new showerhead will not increase pressure if the problem is upstream — a clogged cartridge, closed valve, or main line issue. However, some showerheads are designed to feel more forceful by concentrating water into fewer, larger streams. These can make low pressure feel more noticeable.

What is normal water pressure for a shower?

Most homes have 40 to 60 PSI at the meter. A shower should feel comfortable at 50 PSI. Below 40 PSI, most people notice weak flow. A plumber can measure your pressure with a gauge to confirm whether your supply is the problem.