How to Fix a Dripping Faucet

A dripping faucet wastes water, stains the sink, and makes a small sound that seems designed to keep you awake. Most drips come from a worn cartridge, seat, or O-ring, and many can be fixed with a few basic tools and the right replacement part.

The hardest part is usually identifying your faucet model. Take a photo before you take anything apart, bring the old part to the hardware store, and match it exactly. If the valve body is corroded or the faucet is very old, replacing the faucet may be simpler than repairing it.

Know when to call a plumber

If the shutoff valve will not close, if water is leaking inside a wall, or if the faucet body is cracked, stop and call a licensed plumber. A small repair should not turn into a water-damage job.

Things you'll need

• Screwdrivers (Phillips and flathead)
• Adjustable wrench and hex keys
• Replacement cartridge, seat, or O-rings for your model
• Silicone plumber's grease
• Towel, bucket, and a rag
• White vinegar for mineral buildup

Step-by-step

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Step 1: Identify the faucet type

A single-handle faucet usually has a cartridge or ball valve inside. A two-handle faucet typically uses compression stems or ceramic cartridges. Look for a brand name or model number under the handle or on the base.

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Step 2: Shut off the water

Close the hot and cold shutoff valves under the sink. Turn the faucet on to release pressure and confirm the water is off. If there are no shutoff valves, close the main water valve and open a low faucet elsewhere to drain the line.

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Step 3: Plug the drain and protect the sink

Put the drain plug in so small screws cannot fall in. Lay a towel in the sink and set out a small container for parts. Take a photo at each stage so reassembly is easier.

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Step 4: Remove the handle

Pop off the decorative cap if there is one, then remove the screw or hex bolt underneath. Pull the handle straight up. If it is stuck, wiggle gently rather than forcing it.

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Step 5: Inspect the cartridge or stem

Remove the retaining nut and pull out the cartridge or stem. Look for cracks, worn rubber, or mineral buildup. For two-handle faucets, check the seat and spring as well. Clean metal parts with vinegar if they are scaled.

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Step 6: Replace the worn parts

Install the exact replacement cartridge, seat, or O-rings. Coat rubber parts with a thin layer of silicone grease. Do not substitute a "close enough" part — a mismatched cartridge will leak or fail quickly.

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Step 7: Reassemble and test

Reinstall the handle and cap, then open the shutoff valves slowly. Run hot and cold water, watch for leaks around the base and under the sink, and check the aerator. Tighten gently if needed.

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Step 8: If it still drips

Recheck the model number and the direction the cartridge was installed. Sediment can also damage a new seat. If the leak continues or the valve body is damaged, replace the faucet or call a plumber.

Tips

• Photograph each disassembly step with your phone.
• Bring the old cartridge to the store to match it exactly.
• Soak mineral-covered parts in white vinegar for 30 minutes.
• Replace the supply hoses if they look brittle or bulging.
• Keep a towel under the work area to catch drips.

Warnings

• Always shut off the water before disassembling a faucet.
• If water is near electrical outlets or appliances, turn off the breaker first.
• Do not force a corroded valve; a broken valve can cause flooding.
• If you rent, get permission from your landlord before making repairs.

Frequently asked questions

Why does my single-handle faucet drip?

Most often the cartridge or its O-rings are worn. Replacing the cartridge usually fixes it. Match the exact model from the brand.

Why does my two-handle faucet still drip after replacing the washer?

The valve seat may be worn or sediment may be trapped. Replace the seat or clean it, and check that the stem threads are not damaged.

How much water does a drip waste?

A steady drip can waste many gallons per day, and a small stream wastes far more. Fixing it quickly saves water and money.