How to Fix a Leaky Utility Sink Faucet

Faucets in utility sinks take a beating. Unlike the delicate fixtures in your kitchen or bathroom, these workhorses are often subjected to grit, heavy use, and debris, which eventually causes the internal seals to fail. A steady drip isn't just an annoyance; it wastes water and can lead to mineral buildup that makes a simple repair much harder down the road. Fixing this is a classic DIY job that requires only a few standard tools and a bit of patience. When done well, the handle turns smoothly, the seal is airtight, and you regain control over your water flow. Focus on identifying whether you have a compression faucet with rubber washers or a cartridge-style unit, as the internals differ significantly.

Stop the Water Flow. Locate the shut-off valves under the sink and turn them clockwise until tight. Open the faucet handles fully to drain any remaining water from the lines.
Pop Off the Handle. Pry off the decorative cap on top of the handle using a flathead screwdriver. Use a screwdriver to remove the screw underneath, then pull the handle straight up and off.
Remove the Stem. Use an adjustable wrench to loosen the packing nut by turning it counter-clockwise. Once the nut is loose, pull the stem or cartridge assembly straight out of the faucet body.
Swap in New Seals. Examine the rubber washer at the base of the stem or the O-rings on the cartridge. Replace any damaged or flattened rubber components with exact matches.
Scrub the Valve Seat. Look down into the faucet body where the stem was seated. Use a clean cloth or a small wire brush to remove any mineral scale or sediment buildup on the seat.
Put It Back Together. Insert the stem or cartridge back into the faucet body and tighten the packing nut snugly. Reattach the handle, secure the screw, and replace the decorative cap.
Verify It Works. Turn the water supply back on slowly and check for leaks at the base of the handle. Operate the faucet through its full range of motion to ensure it functions properly.