Fix Low Water Pressure in a Kitchen Faucet

A kitchen faucet that dribbles instead of flows is annoying and makes basic tasks take twice as long. The good news: the fix is almost always simple and costs nothing but your time. The pressure loss happens gradually, so you'll notice it first when washing dishes or filling a pot. Before you call a plumber, check three things in order: the aerator (the screen at the faucet tip), the shut-off valve under the sink, and the valve cartridge inside the faucet body. Nine times out of ten, mineral deposits clogging the aerator are the culprit. Fixing it is faster than making coffee. Water pressure problems feel urgent but they're rarely emergencies. The water is still reaching your faucet—it's just being restricted somewhere between the source and the spout. That restriction is usually deliberate (a partially closed valve) or accidental (sediment or calcium buildup blocking the line). You don't need special tools or plumbing experience to find and fix the problem. This guide walks you through the diagnosis and repair in the order you're most likely to find the issue.

1. Open Valves Fully First. Open the cabinet under your kitchen sink. Look at the pipes coming down from the faucet. You'll see two shut-off valves (one for hot, one for cold) with a small handle or knob on each. Turn both handles counterclockwise until they stop—don't force them. Then turn them back clockwise a quarter turn. If pressure improves, the valve was partially closed and you're done. If not, move to the next step.
2. Spot the Mineral Culprit. Look at the tip of your faucet spout. The aerator is the removable screen that sits at the very end, usually held on with a small collar nut. Unscrew it by turning counterclockwise by hand—it's not tight. Once off, hold it up to the light. You'll see small holes; if they're clogged with white, chalky mineral deposits or gray sediment, you've found your problem. Rinse it under warm water and rub it gently with an old toothbrush or soft cloth to loosen buildup.
3. Dissolve Deposits with Vinegar. If brushing doesn't clear the deposits, fill a small cup with white vinegar and submerge the aerator for 15 to 30 minutes. The vinegar will dissolve mineral buildup. Then rinse it thoroughly under running water and rub again with the toothbrush. Make sure all the small holes are clear by looking through them toward a light source.
4. Reassemble and Verify. Screw the aerator back onto the faucet spout by hand, turning clockwise. Tighten it snug but don't use tools—hand-tight is correct. Turn on both hot and cold water to full pressure and listen for any change in the flow sound. If pressure is now normal, you're finished. If pressure is still low, the problem is inside the faucet body.
5. Purge Sediment From Lines. Turn off both shut-off valves under the sink by turning them clockwise until they stop. Place a bucket under the shut-off valves. Loosen the connection between each shut-off valve and the faucet supply line using an adjustable wrench. Turn the water back on briefly—just for a few seconds—to flush sediment from the lines. You may see rust or sediment spray out. Then turn the water off again, reconnect the supply lines, and turn the shut-off valves back on.
6. Isolate the Weak Outlet. Turn the faucet on at full and test the pressure at different positions. Check the main spout, the pull-down or pull-out spray head if you have one, and any side sprayers. If the main spout has good pressure but the spray head is weak, the problem is in the spray head itself and you can replace just that component. If all outlets are still weak, the issue is likely the valve cartridge inside the faucet.
7. Swap the Internal Cartridge. If all steps above haven't restored pressure, the valve cartridge inside the faucet body is likely clogged or worn. Turn off both shut-off valves. Locate the handle or lever on top of the faucet. Most faucets have a small screw or cap under or behind the handle; remove it to access the cartridge. The cartridge pulls straight out. Take it to the hardware store to match the exact model. Replace it with an identical cartridge and test. This step requires more care but no special skills—the cartridge is a plug-and-play part.