How to Fix a Dripping Faucet
A dripping faucet wastes more than 3,000 gallons of water per year and can add $20 or more to your monthly water bill. The fix is almost always a worn cartridge, washer, or O-ring — parts that cost under $10 and take 20-30 minutes to replace with basic tools.
What You'll Need
🛠 Tools
📦 Materials
Step-by-Step Instructions
Identify Your Faucet Type
Before disassembling anything, determine which of the four faucet types you have: ball-type (single handle that moves over a rounded ball), cartridge (single or double handle with a cylindrical cartridge inside), ceramic disc (single lever over a wide cylindrical body), or compression (two separate handles that tighten down to close). The faucet type determines which internal parts you'll replace. Check the manufacturer name printed on the faucet body or spout — you'll need it to buy the correct replacement parts.
If you can't find the brand name on the faucet, check under the sink for a label on the supply lines, or take a photo and show it to the hardware store staff.
Shut Off the Water Supply
Locate the shut-off valves beneath the sink — there should be one for hot and one for cold. Turn both valves fully clockwise until they stop. If your sink doesn't have dedicated shut-off valves, turn off the main water supply for the house. Open the faucet handles to release any remaining water pressure and drain the lines completely.
Place a towel or rag in the sink basin to cover the drain. This prevents small screws, O-rings, and clips from falling down the pipe during disassembly.
Remove the Faucet Handle
Most handles have a decorative cap on top — pry it off gently with a flat-head screwdriver to reveal the handle screw underneath. Remove the screw (Phillips-head or Allen key, depending on the brand) and pull the handle straight up. If the handle is stuck from mineral buildup, wrap it with a vinegar-soaked cloth for 15 minutes to dissolve deposits, then try again with gentle wiggling.
Take a photo of each stage as you disassemble. The reassembly order matters, and a quick reference photo saves guesswork.
Expose and Remove the Cartridge or Stem
With the handle off, you'll see the internal mechanism. For cartridge faucets, use needle-nose pliers to pull out the retaining clip (a small brass or plastic C-clip), then grip the cartridge and pull straight up with firm, even pressure. For compression faucets, use an adjustable wrench to unscrew the packing nut counterclockwise, then unthread the stem. Note the exact orientation of the cartridge before removal — the tabs or notches must go back the same way.
If the cartridge feels frozen in place, do not force it with pliers. Use a cartridge puller tool ($10-15 at hardware stores) to avoid cracking the cartridge body or damaging the brass valve seat — a much more expensive repair.
Inspect and Identify Worn Parts
Examine the removed cartridge, washers, and O-rings closely. Look for flattening, cracking, tears, or visible indentation on rubber washers. O-rings that feel stiff, cracked, or compressed have lost their seal. For ball-type faucets, inspect the rubber valve seats and springs inside the faucet body — these are the most common failure points. Clean any mineral buildup from the valve seat inside the faucet body using white vinegar and a soft cloth.
Buy the Correct Replacement Parts
Take the old cartridge or worn parts to the hardware store for an exact match. Most major brands (Moen, Delta, Kohler, American Standard) sell branded replacement cartridges and repair kits. Search for the faucet brand plus model number printed on the faucet body. For ball-type faucets, buy a complete repair kit that includes the ball, springs, seats, and O-rings — it's only a few dollars more than individual parts and ensures everything is fresh.
Having a photo of the old cartridge on your phone saves enormous time at the hardware store. Generic "universal" parts often don't fit precisely — brand-specific replacements are worth the extra dollar or two.
Install New Parts
Apply a thin coat of silicone-based plumber's grease to all new O-rings and the outside of the new cartridge. For cartridge faucets, align the tabs with the notches in the faucet body and press the cartridge firmly downward until fully seated, then reinstall the retaining clip. For compression faucets, place the new washer on the stem, tighten the brass screw to hold it, and thread the stem back in. Wrap any threaded connections with one or two turns of Teflon tape.
Never use petroleum jelly (Vaseline) on plumbing O-rings — it degrades rubber over time. Always use silicone-based plumber's grease, which is safe for rubber and plastic.
Reassemble the Faucet
Replace the handle by sliding it back onto the stem and tightening the handle screw snugly — firm but not overtightened, as excessive torque can crack the handle or strip the screw. Snap or press the decorative cap back into place. Tighten all connections hand-tight plus a quarter turn with a wrench. Wrap your wrench jaws with a cloth or painter's tape to avoid scratching the faucet finish.
Restore Water and Test
Slowly open the shut-off valves — turn them gradually over 10-15 seconds to prevent water hammer (a sudden banging in the pipes). Let water run for 30 seconds to flush any debris. Turn the faucet fully off and watch the spout for 60 seconds. Zero drips means success. Check under the sink around the supply line connections for any moisture.
If there's still a slight drip after replacing the cartridge, the valve seat inside the faucet body may be pitted or worn. A valve seat wrench ($8) can resurface it in minutes, or a replacement seat runs about $5.
Frequently Asked Questions
How long does it take to fix a dripping faucet?
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This project typically takes about 30 min. The guide includes 9 steps with detailed instructions for each.
What tools do I need?
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You will need: Adjustable wrench, Phillips-head screwdriver, Flat-head screwdriver, Needle-nose pliers, Allen key set (hex wrenches), Utility knife. Materials include: Replacement cartridge or washer (match to your faucet brand and model), O-rings (assorted sizes or faucet-specific kit), Silicone-based plumber's grease, Teflon tape, White vinegar (for mineral deposits), Clean rags or towels.
Is this a good project for beginners?
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Yes! This is rated as an easy project that most homeowners can complete with basic tools and no prior experience.
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Sources & further reading
- Fix a Leak Week — U.S. EPA WaterSense
- Plumbing Repairs & How-Tos — This Old House
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