How to Fix Low Water Pressure in One Faucet

Low water pressure in a single faucet is usually caused by a clogged aerator or mineral buildup in the faucet itself, both of which you can fix in under an hour with basic tools.

  1. Start with the simplest fix first. Unscrew the aerator at the tip of your faucet spout by turning it counterclockwise with your fingers or pliers wrapped in a cloth to avoid scratches. Hold it up to the light and look for mineral deposits or debris blocking the tiny holes. If it looks clogged, this is likely your culprit.
  2. Dissolve mineral deposits fast. Soak the aerator in white vinegar for 15-30 minutes to dissolve mineral buildup. Use an old toothbrush to scrub away stubborn deposits, and poke out individual holes with a toothpick or small wire. Rinse with hot water and reassemble any screens or washers in the correct order before screwing it back onto the faucet.
  3. Isolate the problem quickly. Turn on nearby faucets to see if they have normal pressure. If they do, your problem is isolated to this one faucet. If multiple faucets have low pressure, you may have a main water line issue that requires professional attention.
  4. Verify full water flow supply. Look under the sink for two shut-off valves connected to the hot and cold water lines. Turn each valve counterclockwise to ensure they are fully open. Sometimes these valves get partially closed during maintenance or accidentally bumped, restricting water flow.
  5. Deep clean or replace cartridge. If cleaning the aerator didn't work, turn off the water supply and remove the faucet handle and packing nut to access the cartridge. Pull out the cartridge with pliers and check for mineral buildup or damage. Clean it with vinegar and a brush, or replace it entirely if it's cracked or heavily corroded.
  6. Clear hidden debris buildup. With the cartridge removed, turn the water back on briefly to flush out any debris that might be stuck in the faucet body. Place a bucket under the faucet to catch the water. This often clears out small particles that restrict flow.