Why Low Water Pressure in the Bathroom?


Several reasons account for why water pressure may be low in your bathroom faucet. The reason lies in either the faucet or the bathroom and home plumbing. When the water pressure drops in a faucet, you'll need to check a few issues that evolve over the life of your appliance. Fixing one of these problems returns the higher water pressure to the faucet.

Cartridge Clogged or Damaged

  • A small, tube-shaped cartridge in the faucet's body controls the mixture of hot and cold water. The cartridge has inlets inside of discs that allow water through to the spout of the faucet. If these small inlets clog up with dirt or debris, the water pressure in the faucet drops. To fix this issue, take the handle off the faucet by unscrewing the set screw and then pulling the handle off. Unscrew the bonnet, if applicable, remove the cartridge clip and pull out the cartridge. Either wash it in clean water or replace it with a new one. Assemble the faucet again.

Supply Valves Shut

  • The two supply lines running to the base of the faucet are charged with the duty of carrying water to it. They run from the end of the home's water pipes underneath the sink to the faucet base. Each pipe has a valve to shut the water off. If one or both of these supply valves is closed, or even partially closed, the faucet experiences a reduction in water pressure. Check under the sink and fully open each valve by turning each one clockwise all the way, and then check the water pressure again.

Aerator Clogged or Low Flow

  • Another possibility is a clogged aerator, which is the metal screen on the end of the bathroom faucet spout. When this clogs up with dirt or sediment, the water pressure drops as well. Unscrew the aerator by hand and thoroughly wash it in clean water. Alternatively, replace it with a brand new aerator made for your bathroom faucet. Screw the aerator back on the end of the spout. Some aerators are low flow, meaning they reduce water pressure. If you just installed a new aerator, see if it is a low-flow product and change it if you don't like this new feature.

Environmental Factors and Low-Flow Faucets

  • Manufacturers build low-flow faucets designed to conserve water. Your faucet may be one of these water-saving faucets, and therefore it will have lower water pressure. If you just installed a new bathroom faucet, this may be the case; if the water pressure drop is sudden, then this is not the case. Environmental factors also affect water pressure. If reservoir levels drop during the dry season, lower water pressure occurs throughout the home, for instance. Water main breaks are another exterior factor that reduces water pressure. Water pressure will drop in every faucet in the house if one of these factors is the cause. Contact your city water department, and ask if any issues are currently affecting your water pressure.

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