How to Fix a Leaky Kitchen Sink Sprayer

Drips from a kitchen sink sprayer are more than just a minor annoyance; they signal that your plumbing seals have reached the end of their lifespan. A well-functioning sprayer should provide a crisp, clean stream without any leakage at the connection point or the spray head itself. When you see water pooling around the base of the sprayer hose or spraying inconsistently, it is time to intervene before that slow drip creates a bigger moisture issue under your cabinet. Successfully repairing a sprayer requires a methodical approach to dismantling the connection points. Most of the time, the fix is as simple as swapping out an O-ring or clearing debris from the aerator. If the leak persists, the culprit is usually the diverter valve—a small part responsible for switching water flow from the faucet to the sprayer. Keep your workspace dry, have a bucket ready for residual water, and work systematically to ensure every connection is seated properly.

1. Cut Water Before You Start. Locate the shut-off valves under the kitchen sink and turn them clockwise until they are completely closed. Open the faucet and the sprayer handle to relieve any remaining pressure in the lines.
2. Free the Hose Assembly. Use an adjustable wrench to carefully unscrew the hose connection from the sprayer head or the faucet diverter. Pull the hose gently away from the fixture to expose the connection fitting.
3. Swap the Worn Washers. Examine the rubber O-rings or washers located inside the connection nut. If they are cracked, flattened, or brittle, pry them out with a small screwdriver and replace them with new, identical-sized washers.
4. Dissolve the Mineral Buildup. Unscrew the head of the sprayer and soak it in a bowl of white vinegar for an hour to dissolve mineral deposits. Use an old toothbrush to scrub the nozzle holes clean before rinsing it thoroughly.
5. Diagnose the Diverter Valve. If the leak is at the base of the faucet, locate the diverter valve—usually found inside the faucet body where the sprayer hose attaches. Unscrew it and inspect the rubber seals for damage; if they are worn, replace the entire diverter cartridge.
6. Verify the Repair Works. Reattach the hose, ensuring the threads are aligned correctly so they do not cross-thread. Tighten the connection by hand, then add a final quarter-turn with a wrench before turning the water supply back on to check for leaks.