How to Fix a Leaking Kitchen Sink Sprayer

Dripping or spraying water from the base of your kitchen sink sprayer is a common annoyance that usually signals a failed seal rather than a major plumbing catastrophe. Most side-sprayers operate under simple pressure; when the rubber gaskets inside harden or the plastic housing develops a hairline crack, water follows the path of least resistance and starts leaking underneath the sink or directly at the sprayer head. Fixing this is a straightforward maintenance task that requires no special tools beyond a pair of pliers and some plumber's tape. When done well, the sprayer will operate smoothly without any residual dripping or loss of pressure. Focus on identifying the exact location of the leak first, as that determines whether you are performing a simple repair or a full component swap.

1. Kill the Pressure First. Locate the shut-off valves under the kitchen sink and turn them clockwise until they stop. Open the sprayer handle to release any remaining pressure in the line.
2. Unthread the Hose. Reach behind the sink and unscrew the sprayer hose from the diverter valve, which is usually located on the faucet's underside. Use pliers only if the connection is too tight to turn by hand.
3. Find the Culprit. Unscrew the spray head from the hose end. Inspect the rubber O-ring inside the connection point for debris, mineral buildup, or obvious signs of cracking.
4. Swap the Seal. If the O-ring is damaged, replace it with a matching size from your hardware store. If the plastic casing of the sprayer head shows a hairline crack, replace the entire head assembly.
5. Reconnect with Care. Thread the hose back onto the diverter valve, ensuring you include a fresh rubber washer if the old one is compressed or worn. Hand-tighten the nut firmly, then give it a final quarter-turn with pliers.
6. Verify the Fix Works. Slowly turn the water valves back on under the sink. Operate the faucet and engage the sprayer repeatedly to check for any moisture at the connection points.