What causes a kitchen faucet handle to drip?

Most drips originate from a worn cartridge, deteriorated O-rings, or a corroded valve seat. Single-handle faucets typically use a cartridge; two-handle faucets use cartridges or ceramic disc valves. The fix is the same in each case: replace the worn internal part.

Do I need to turn off the main water supply to fix a faucet?

No, in most cases. Turn off the shutoff valves under the sink — one for hot, one for cold. Twist them clockwise until they stop. If the under-sink valves are seized or absent, then shut off the main supply to the house.

How do I know if I need a new cartridge or just new O-rings?

If the faucet drips from the spout when the handle is off, the cartridge or valve seat is worn. If water leaks from around the base of the handle, O-rings are the likely culprit. Often replacing the full cartridge is easier than sourcing individual O-rings.

How do I find the right replacement cartridge for my faucet brand?

Look for the brand name stamped on the faucet body or the original packaging. Take the old cartridge to a hardware store for matching, or search the brand name plus the word cartridge on Amazon. Moen, Delta, and Kohler all sell brand-specific replacement cartridges.

Can a dripping faucet increase my water bill significantly?

Yes. A faucet dripping once per second wastes around 3,000 gallons of water per year. At average US water rates, that adds roughly $20 to $40 annually — more in high-rate municipalities. Fixing it pays back the cost of parts within months.

What if the faucet still drips after I replace the cartridge?

Check that the cartridge is fully seated and oriented correctly — many cartridges have tabs that must align with notches in the valve body. Also inspect the valve seat inside the faucet body for pitting or corrosion. A corroded seat can be resurfaced with a seat wrench and seat grinder tool, or the faucet can be replaced.

How to Fix a Dripping Kitchen Faucet Handle: Step-by-Step Guide

A dripping kitchen faucet is one of the most common plumbing complaints in any home, and it is almost always fixable without a plumber.

A dripping kitchen faucet is one of the most common plumbing complaints in any home, and it is almost always fixable without a plumber. The internal cartridge or O-rings wear out over years of use, and replacing them costs $10 to $30 in parts versus $150 or more for a service call.

Identifying Your Faucet Type

Kitchen faucets fall into three main categories, each with a slightly different repair approach:

Single-handle cartridge faucet: One lever controls both temperature and flow. This is the most common type. Repair involves replacing the cartridge.
Two-handle faucet: Separate hot and cold handles, each with its own cartridge or ceramic disc. Determine which handle is dripping — usually the hot side — and replace only that cartridge.
Ball faucet: A single ball-shaped cap sits inside the handle. These have more parts (springs, seats, O-rings, the ball itself) and are slightly more involved to repair. A ball faucet repair kit contains everything in one package.

What You Will Need

Adjustable wrench or channel-lock pliers
Phillips and flathead screwdrivers
Allen wrench set (hex keys)
Replacement cartridge or repair kit matching your faucet brand
Plumber’s grease (silicone-based)
Clean rag and bucket

A faucet cartridge puller tool makes removal easier on stubborn cartridges, though needle-nose pliers work in most cases.

Step 1: Shut Off the Water Supply

Locate the shutoff valves under the sink and turn them clockwise until fully closed. Open the faucet handle to release any remaining pressure and drain the lines. Place a rag or small bucket under the sink to catch drips.

Step 2: Remove the Handle

Look for a decorative cap on top of the handle — this often covers a Phillips screw. Pry the cap off with a flathead screwdriver, remove the screw, and pull the handle straight up. Some handles use a set screw on the side or back secured with an Allen wrench (typically 1/8 inch or 3/32 inch). Remove the set screw and lift the handle off.

Step 3: Access the Cartridge

With the handle off, you will see the cartridge assembly. There may be a retaining clip, nut, or collar holding the cartridge in place:

Retaining clip: A U-shaped metal clip that slides straight up and out with needle-nose pliers.
Packing nut: Unscrew counterclockwise with a wrench.

Photograph the cartridge orientation before removing it — the notches and flat side must go back in the same direction.

Step 4: Remove the Old Cartridge

Grip the top of the cartridge with pliers (wrap the jaws with tape to avoid scratching) and pull straight up firmly. Some cartridges require a cartridge puller for leverage. Wiggle gently side to side if it resists — do not pry at an angle.

Step 5: Install the New Cartridge

Apply a thin coat of silicone-based plumber’s grease to the outside of the new cartridge before insertion. This helps it seat fully and extend its service life. Align the cartridge so the hot side faces the hot side of the faucet — there is usually a tab or flat edge that registers into a slot in the valve body. Press firmly until the cartridge seats completely, then reinstall the retaining clip or packing nut.

Step 6: Reassemble and Test

Reverse the disassembly steps: reinstall the handle collar if present, set the handle in place, tighten the handle screw, and replace the decorative cap. Slowly open the shutoff valves under the sink. Turn the faucet on to flush out any debris loosened during the repair, then turn it off and watch the spout. A correctly installed cartridge stops the drip immediately.

If the handle feels stiff, back out the packing nut slightly (one-eighth of a turn) — it may be overtightened.

When to Replace the Whole Faucet

Cartridge replacement fixes most drips. However, if the valve body is cracked, severely corroded, or the faucet is more than 20 years old, a full faucet replacement is often more economical. A quality mid-range kitchen faucet costs $80 to $200 and will last another 15 to 20 years.

Maintenance Tips

Inspect under-sink valves annually to confirm they still turn freely.
Avoid over-tightening the faucet handle — it accelerates cartridge wear.
Replace cartridges proactively if you notice the handle becoming stiff or water temperature hard to dial in, rather than waiting for a full drip.

Fixing a dripping faucet handle is one of the highest-return DIY repairs in the house — a $15 cartridge and 90 minutes of work saves thousands of gallons of water and a plumber bill.

⏰ PT2H 💰 $10–$30 🔧 SharkBite push-to-connect fittings, PEX or copper pipe, Pipe cutter, Teflon tape, Channel-lock pliers

Shut Off the Water Supply
Locate the shutoff valves under the sink and turn them clockwise until fully closed. Open the faucet handle to release any remaining pressure and drain the lines. Place a rag or small bucket under the sink to catch drips.
Remove the Handle
Look for a decorative cap on top of the handle — this often covers a Phillips screw. Pry the cap off with a flathead screwdriver, remove the screw, and pull the handle straight up.
Access the Cartridge
With the handle off, you will see the cartridge assembly. There may be a retaining clip, nut, or collar holding the cartridge in place:
Remove the Old Cartridge
Grip the top of the cartridge with pliers (wrap the jaws with tape to avoid scratching) and pull straight up firmly. Some cartridges require a cartridge puller for leverage. Wiggle gently side to side if it resists — do not pry at an angle.
Install the New Cartridge
Apply a thin coat of silicone-based plumber's grease to the outside of the new cartridge before insertion. This helps it seat fully and extend its service life.
Reassemble and Test
Reverse the disassembly steps: reinstall the handle collar if present, set the handle in place, tighten the handle screw, and replace the decorative cap. Slowly open the shutoff valves under the sink.