Start with the showerhead itself

The fastest fix is often the simplest: your showerhead may be clogged with mineral deposits or debris. Hard water leaves calcium and lime buildup inside the nozzles, which narrows the openings and reduces flow. Before you replace anything, unscrew the showerhead from the arm and soak it in white vinegar for 30 minutes to an hour. Use an old toothbrush to scrub the face and the threads where it connects to the pipe.

While the showerhead soaks, check the inlet screen—a small mesh filter inside the connection where the showerhead meets the arm. Unscrew the showerhead, look into the opening, and you may see a flat screen or strainer. If it's clogged, remove it carefully (it may be glued in place) and rinse it under running water. If cleaning doesn't restore pressure, the screen may need replacement; hardware stores sell inlet screens for a few dollars.

After cleaning, reinstall the showerhead and test. If pressure improves, you've solved it. If not, move to the next step.

Key Takeaways

  • Mineral buildup inside the showerhead is the most common cause of low pressure and can be cleared by soaking in vinegar and scrubbing with a brush.
  • The inlet screen where the showerhead connects to the arm often traps debris and can be removed and rinsed or replaced for under ten dollars.
  • If cleaning the showerhead doesn't work, check the shut-off valve under the sink to make sure it is fully open.
  • Low pressure in only one shower usually points to a clogged line or valve; low pressure everywhere in the house suggests a main water supply issue that requires a plumber.
  • Pressure-boosting showerheads can help if your home's water pressure is genuinely low, but they cannot fix a clogged line.

Check the shut-off valve under your sink

Every sink has a shut-off valve underneath, usually two of them—one for hot water and one for cold. These valves are ball valves (shaped like a lever) or gate valves (shaped like a knob). If someone turned one partially closed during a repair or cleaning, it will reduce flow to that fixture. Look under the sink and trace the supply lines coming from the wall to the faucet. The valve should be fully open: a lever should point in line with the pipe, and a knob should turn counterclockwise until it stops.

Open both valves fully, then run the shower again. If pressure jumps back to normal, the valve was the culprit. If pressure is still low, the problem lies deeper in the line.

Look for a clogged supply line

If only one shower has low pressure, the supply line feeding that shower may be blocked. Sediment, rust, or mineral deposits can accumulate inside the pipe over time, especially in older homes with galvanized steel pipes. This is harder to diagnose without opening walls, but you can test by turning on other fixtures in the house—the kitchen sink, another bathroom, the washing machine. If they all have normal pressure, the problem is isolated to that shower's line.

At this point, you have two options. You can try flushing the line by turning off the water at the main shut-off valve, opening all fixtures in the house to release pressure, then turning the main back on. This sometimes dislodges sediment. If that doesn't work, or if you suspect rust or mineral buildup, a plumber can inspect the line with a camera or replace the affected section. Galvanized pipes in particular corrode from the inside and often need replacement in homes over 40 years old.

Check your home's main water pressure

If low pressure affects multiple showers and fixtures throughout the house, the problem is your home's incoming water supply, not the shower itself. You can measure this with a water pressure gauge, a straightforward tool that screws onto an outdoor faucet or a hose bib. They cost $10 to $20 at hardware stores. Turn off all water use in the house, screw the gauge onto the outdoor faucet, and turn it on. A reading between 40 and 80 pounds per square inch (PSI) is normal. Below 40 PSI will feel weak; above 80 PSI can damage fixtures.

If your reading is below 40 PSI, contact your water utility to report low pressure. They can check the main line and meter. Low pressure from the utility is rare but does happen during main breaks or high-demand periods. If the utility confirms normal pressure at the meter, the problem is between the meter and your home—usually a clogged main shut-off valve or a failing pressure regulator. Both require a plumber.

Install a pressure-boosting showerhead

If your home's water pressure is genuinely low (below 40 PSI) and you've ruled out clogs and valve problems, a pressure-boosting showerhead can help. These showerheads use a smaller nozzle opening to concentrate flow and create the sensation of higher pressure. They don't actually increase pressure—they can't—but they make the water feel stronger. Brands like Kohler, Moen, and Delta make them, and they cost $30 to $80.

A pressure-boosting showerhead works best when your home's pressure is low but stable. It will not help if the problem is a clogged line, because the blockage prevents water from reaching the showerhead in the first place. Install one by unscrewing your old showerhead and screwing the new one on by hand—no tools needed. Wrap the threads with plumber's tape first to prevent leaks.

When to call a plumber

Call a plumber if low pressure affects multiple fixtures throughout your home and your pressure gauge reads below 40 PSI. They can test the main shut-off valve, inspect the pressure regulator (a bell-shaped device usually near the meter), and check for leaks in the main line. If the regulator is failing, replacement typically costs $300 to $500. If the main line is corroded or blocked, the cost depends on how much pipe needs replacement.

Also call a plumber if low pressure is isolated to one shower and cleaning the showerhead and checking the valve didn't help. They can use a camera to inspect the supply line and determine whether it's clogged or corroded. Clearing a clogged line costs less than replacing it, but a corroded galvanized line often needs full replacement.

Frequently Asked Questions

Can I use a water pressure gauge on an indoor faucet?

Yes, but an outdoor faucet is easier. Screw the gauge onto any hose bib or faucet with a threaded outlet. If you use an indoor sink, turn off the shut-off valve under the sink first, then disconnect the supply line and attach the gauge. This is messier and requires a bucket to catch water.

What if my pressure is high, not low?

Water pressure above 80 PSI can damage fixtures and cause leaks. If your gauge reads above 80 PSI, your home likely has a failing pressure regulator. A plumber can replace it or install a new one if you don't have one. This is a safety issue and should not be ignored.

Does vinegar really remove mineral buildup?

Yes. White vinegar is acidic and dissolves calcium and lime deposits. Soak the showerhead for at least 30 minutes; overnight works better for heavy buildup. For stubborn deposits, use a small brush or old toothbrush to scrub while it soaks. Rinse thoroughly with clean water before reinstalling.

Will a new showerhead fix low pressure if the line is clogged?

No. A pressure-boosting showerhead concentrates existing flow but cannot overcome a blockage in the supply line. If the line is clogged, water cannot reach the showerhead in sufficient volume. You must clear or replace the line first.

How often should I clean my showerhead?

In areas with hard water, clean it every three to six months. In soft-water areas, once a year is usually enough. If you notice pressure dropping gradually, that's a sign mineral buildup is starting and it's time to soak and scrub.