Start with the water meter shutoff valve

The fastest fix for low water pressure is often the simplest: your main shutoff valve may be partially closed. This valve sits where the water line enters your house, usually in the basement, crawl space, or outside in a meter box. It looks like a handle or a round knob on the pipe coming from the street.

Turn the handle counterclockwise (or the knob left) until it stops. If it was already fully open, you have ruled out the most common cause. If it was partially closed, you may have just solved the problem. Check your pressure at a sink or shower within a few minutes—it often improves when ready.

Key Takeaways

  • The main shutoff valve at your water meter is the first thing to check; a partially closed valve cuts pressure throughout your whole house.
  • Sediment buildup in aerators (the screens on faucet tips) causes low pressure at single fixtures and takes five minutes to clean.
  • Mineral deposits in your pipes reduce flow over years, especially in hard water areas, and may require professional flushing or pipe replacement.
  • A failing pressure regulator (if your house has one) will drop pressure to all fixtures and needs replacement by a plumber.
  • Low pressure from your water company is not something you can fix at home, but your utility can confirm whether the problem is on their side.

Clean the aerators on your faucets and showerheads

If only one sink, shower, or faucet has low pressure, the problem is almost always sediment trapped in the aerator—the small screen at the tip of the faucet or the holes in your showerhead. Sediment from the water line or from inside your pipes collects there and blocks flow.

Unscrew the aerator by hand (turn it counterclockwise) or use a wrench if it is stuck. Rinse it under running water and use an old toothbrush to scrub away any white, tan, or rust-colored buildup. If the screen is badly clogged, soak it in white vinegar for 30 minutes, then scrub again. Screw it back on and test the pressure.

For showerheads, unscrew the entire head from the arm, soak it in vinegar if needed, and clean the holes with a toothpick or small brush. This same method works on outdoor faucets and garden hose connections.

Check for leaks that reduce pressure

A leak anywhere in your water line—even a small one you cannot see—will lower pressure throughout your house. The leak may be inside a wall, under the foundation, or in the crawl space.

Look for soft spots in your yard, unusually green patches of grass, or water stains on basement walls or ceilings. Listen for running water sounds when all fixtures are off. Check your water meter: turn off every faucet and appliance, wait 10 minutes, and look at the meter again. If the number has changed, you have a leak. A plumber can locate it using a listening device or by pressure testing the line.

Understand what a pressure regulator does and when it fails

Some homes have a pressure regulator—a bell-shaped device on the main water line, usually near the shutoff valve. It keeps incoming pressure from the street (which can be 80 to 100 pounds per square inch) at a safe level for your pipes and fixtures (usually 40 to 60 psi).

If your regulator fails, pressure drops to all fixtures at once. You will notice it suddenly, not gradually. A plumber can test the regulator with a gauge and replace it if it is faulty. Replacement typically takes under an hour. If you do not have a regulator and pressure from the street is very high, a plumber may recommend installing one to protect your pipes.

Flush your water lines if pressure has dropped gradually

Sediment and mineral buildup inside your pipes reduce flow over months or years, especially in areas with hard water. This is different from a clogged aerator—it affects the whole house and happens slowly.

A plumber can flush your lines by opening a low-point drain valve (usually in the basement) and letting water run until it runs clear. This removes loose sediment but cannot dissolve mineral deposits that have hardened to the pipe walls. If flushing does not help, the deposits may be too thick, and the plumber may recommend replacing the affected section of pipe or installing a water softener if hard water is the root cause.

Rule out problems on your water company's side

If pressure is low at all fixtures and you have ruled out your shutoff valve, regulator, and leaks, the problem may be with the water main or your meter on the street side. Call your water utility and report the low pressure. They can check the main line and meter for free and tell you whether the issue is in your house or theirs.

If the utility finds a problem on their side, they will repair it at no cost to you. If they confirm the problem is in your house, you know to call a plumber. Some utilities also have a pressure test kit you can borrow to measure your incoming pressure yourself.

Consider upgrading your water pump if you have a well

If your home uses a private well, low pressure usually means the pump is failing or undersized for your household's demand. Well pumps typically last 8 to 15 years. A plumber or well contractor can test the pump and replace it if needed. This is not a DIY job—it requires specialized equipment and knowledge of your well system.

If you have recently added bathrooms or fixtures and pressure dropped after that, your pump may straightforward be too small for the new load. A contractor can install a larger pump or add a pressure tank to improve flow.

Frequently Asked Questions

Why is my water pressure low only in the morning?

Morning low pressure often means your water company is doing maintenance or flushing the main line. It usually returns to normal within a few hours. If it happens every morning, call your utility to ask whether they are doing scheduled work. If not, you may have a small leak that drains pressure overnight.

Can I increase water pressure myself without calling a plumber?

Yes, if the problem is a closed shutoff valve or a clogged aerator—both are five-minute fixes. If pressure is low throughout your house and those are not the cause, you will need a plumber to test your regulator, check for leaks, or flush your lines.

What water pressure should I have?

Normal household pressure is 40 to 60 pounds per square inch (psi). You can measure it with a pressure gauge (available at hardware stores for under $15) screwed onto an outdoor faucet. If your pressure is below 40 psi, it is worth investigating. Above 80 psi, a regulator can protect your pipes.

Does a water softener increase pressure?

No. A water softener removes minerals but does not change pressure. However, if mineral buildup is blocking your pipes and reducing pressure, softening the water going forward will prevent the problem from getting worse. A plumber can flush existing deposits separately.

How much does it cost to fix low water pressure?

Cleaning an aerator is free. A plumber's visit to test pressure, check the regulator, or locate a leak typically costs $100 to $200 for the service call. Replacing a regulator runs $300 to $500 installed. Flushing lines or repairing a leak varies widely depending on where the problem is.