How to Fix a Leaking Kitchen Faucet at Home: Complete DIY Guide
Drip. Drip. Drip. That tiny drop of water falling from your kitchen faucet every few seconds does not sound like much — until you calculate how much that leak is costing you on your water bill every single month.
TL;DR
A leaking kitchen faucet is almost always caused by a worn-out rubber seal, O-ring, or cartridge inside the handle. You can fix most leaks yourself in under an hour with basic tools — an adjustable wrench, screwdriver, and a replacement part that costs $5 to $30. Turn off the water supply valves under the sink first. Take the old part to the hardware store to match it exactly. The most common leak types are a steady drip from the spout (bad cartridge), water pooling around the handle base (bad O-ring), or leaking from where the faucet meets the sink (loose mounting nuts).
Key Takeaways
- A dripping faucet wastes about 3,000 gallons of water per year — that is 180 showers worth of water down the drain.
- Most faucets use one of four designs: cartridge, ceramic disk, ball-type, or compression. Identifying yours is the first step.
- The fix usually costs under $30 and takes less than an hour. A plumber would charge $150 to $300 for the same job.
- Always turn off the water supply valves under the sink before starting. If they are stuck or broken, turn off the main water valve to your house.
- Take photos as you disassemble — they are your roadmap for putting everything back together.
What That Drip Is Costing You
That slow, steady drip might seem harmless. It is not.
| Drips Per Minute | Gallons Wasted Per Day | Gallons Wasted Per Year | Extra Cost Per Year* |
|---|---|---|---|
| 10 drips | 1.4 gallons | 511 gallons | $6-8 |
| 30 drips (one every 2 seconds) | 4.2 gallons | 1,533 gallons | $18-24 |
| 60 drips (one per second) | 8.4 gallons | 3,066 gallons | $37-46 |
| Steady slow stream | 20+ gallons | 7,300+ gallons | $88+ |
*Based on average US water rates. Costs are higher in areas with expensive water.
Beyond the cost, a leaking faucet can cause:
- Mineral stains in your sink
- Corrosion on the faucet itself
- Water damage inside your cabinet if the leak is underneath
- Mold growth in damp cabinet spaces
“A leaky faucet is not a cosmetic problem. It is a small plumbing emergency that gets more expensive the longer you ignore it.”
Know Your Faucet: Four Common Types
Before you buy any parts, you need to know what kind of faucet you have. Look at the handle or spout design.
1. Cartridge Faucet (Most Common)
- Looks like: One or two handles that turn smoothly with no hard stop. Single-handle faucets that move left to right for temperature are usually cartridge type.
- How it works: A plastic or brass cartridge with rubber seals moves up and down and side to side to control water flow and temperature.
- Leak sign: Drip from spout. Water leaks from around the handle.
- Fix cost: $10 to $30 for a new cartridge.
2. Ceramic Disk Faucet (High-End Models)
- Looks like: Single, wide handle that moves smoothly. Often found on expensive faucets (Kohler, Grohe, Hansgrohe).
- How it works: Two ceramic disks slide against each other. Almost no rubber parts.
- Leak sign: Drip from spout. Usually means the ceramic disks are cracked or debris is between them.
- Fix cost: $25 to $60 for a replacement disk or cartridge.
3. Ball-Type Faucet (Older Single-Handle)
- Looks like: Single handle that moves in a dome shape. The spout often has a metal cap with holes visible underneath.
- How it works: A hollow metal ball with rubber seats and springs controls water flow.
- Leak sign: Drip from spout. Handle feels loose or wobbly.
- Fix cost: $10 to $20 for a repair kit (springs, seals, and ball).
4. Compression Faucet (Older Two-Handle)
- Looks like: Two separate handles (one hot, one cold) that require multiple turns to open and close. Common in older homes.
- How it works: A rubber washer presses against a metal seat to stop water flow. Over time, the washer wears out.
- Leak sign: Drip from spout. Handle may feel like it is not tightening fully.
- Fix cost: $3 to $10 for replacement washers.
| Faucet Type | Typical Age | Difficulty of DIY Fix | Part Cost |
|---|---|---|---|
| Cartridge | 1990s-present | Easy to moderate | $10-30 |
| Ceramic disk | 2000s-present | Moderate | $25-60 |
| Ball-type | 1970s-1990s | Moderate | $10-20 |
| Compression | Pre-1990s | Easy | $3-10 |
Step-by-Step Fix: Leaking from the Spout (Dripping Water)
This is the most common leak — water dripping from the end of the faucet where it comes out. It means the internal sealing parts are worn and letting water pass even when the faucet is “off.”
What You Will Need
- Adjustable wrench
- Phillips and flathead screwdrivers
- Allen wrench set (hex keys) — many faucet handles use a small set screw
- Replacement cartridge or washer kit (buy after identifying your faucet)
- Plumber’s grease (silicone-based, not petroleum)
- Towels and a bucket
- Flashlight
- Phone to take photos
Step 1: Turn Off the Water
Always turn off the water supply before disassembling any faucet.
Look under your sink. You will see two small valves — one for hot water (usually left) and one for cold (usually right). Turn them clockwise until they stop.
If the valves are stuck or do not turn, turn off the main water valve for your house (usually near your water meter or where the main line enters the basement or crawl space).
After turning off the valves, open the faucet handle to release any remaining water pressure and drain water from the lines.
Always unplug appliances near the sink before working with water. A dripping faucet or loose hose can spray water into electrical outlets or appliances.
Step 2: Remove the Faucet Handle
This step varies by faucet type, but the general approach is the same.
For a handle with a visible screw:
- Look for a small screw on the top or side of the handle.
- Remove the screw with a screwdriver.
- Lift the handle straight up and off.
For a handle with a hidden set screw:
- Look for a small hole on the back or side of the handle.
- Shine a flashlight inside. You will see a small hex screw (Allen screw).
- Use an Allen wrench (hex key) to loosen the screw. Turn counterclockwise.
- Pull the handle upward to remove it.
For a cap-covered screw:
- Some faucets have a decorative cap (often with a hot/cold indicator).
- Pry the cap off gently with a flathead screwdriver.
- Remove the screw underneath.
Take a photo of how the parts come off. This helps during reassembly.
Step 3: Remove the Retaining Nut or Sleeve
Under the handle, you will see a metal nut or a decorative sleeve.
- If it is a nut, use your adjustable wrench to turn it counterclockwise. If it is tight, spray a little penetrating oil (WD-40) and wait five minutes.
- If it is a sleeve (smooth metal cylinder), it may unscrew by hand or require a special tool called a cartridge puller (some hardware stores loan these).
Take another photo of the exposed cartridge or valve before removing it.
Step 4: Remove the Old Cartridge or Washer
For cartridge and ceramic disk faucets:
- The cartridge is the plastic or brass cylinder inside the faucet body.
- Some cartridges pull straight out with pliers. Others require a cartridge puller tool.
- If it is stuck, gently rock it side to side while pulling upward.
- Do not use excessive force. You can break the faucet body.
For ball-type faucets:
- Remove the metal cap (often has holes in it) with pliers or a special tool.
- Inside, you will find a rubber ball with springs and rubber seats underneath.
- Lift out the ball. Remove the springs and rubber seats with a small screwdriver.
For compression faucets:
- Under the handle, you will see a brass stem.
- Unscrew the packing nut (the larger nut) with a wrench.
- Lift out the stem. At the bottom of the stem is a rubber washer held by a small brass screw.
- Remove the screw and replace the rubber washer.
Step 5: Match and Replace the Part
This is the most important step. Do not guess which part you need.
- Take the old cartridge, ball, or washer to a hardware store or home center.
- Show it to the plumbing associate. They can match it exactly.
- For cartridge faucets, write down your faucet brand and model number (often stamped on a metal plate under the spout or on the back of the faucet body).
Buy a repair kit that includes: The cartridge or washer, any rubber seals or O-rings, and silicone plumber’s grease.
Step 6: Lubricate and Install the New Part
Do not install dry rubber parts. They will tear or fail quickly.
- Apply a thin layer of silicone plumber’s grease to all rubber seals, O-rings, and moving parts.
- Insert the new cartridge or ball into the faucet body. Make sure it is oriented exactly like the old one (cartridges have a specific front/back alignment).
- For cartridges with alignment tabs, line them up with the grooves in the faucet body.
- Press the cartridge firmly into place until it bottoms out.
Never use petroleum jelly or plumber’s putty on rubber seals. Petroleum products dissolve rubber over time. Use only silicone-based grease.
Step 7: Reassemble and Test
- Replace the retaining nut or sleeve. Tighten firmly but not crushing tight — hand-tight plus a quarter turn with a wrench is usually enough.
- Reinstall the handle and tighten the screw or set screw.
- Turn the water supply valves back on slowly (counterclockwise).
- Check for leaks around the handle and the spout.
- Run the water for one minute to flush out any debris.
If the faucet still drips: The cartridge or seat may be damaged, or debris may be blocking the new seal. Turn the water off, remove the cartridge, clean the inside of the faucet body with a cloth, and try again.
Fix: Leaking from the Base of the Handle
Water pooling around the handle (not dripping from the spout) means a bad O-ring or worn packing nut.
What causes this:
- The O-ring that seals the handle stem has dried out and cracked.
- The packing nut (the nut around the stem) has loosened.
How to fix:
- Turn off the water supply.
- Remove the handle (same steps as above).
- Look for a rubber O-ring around the stem or cartridge.
- If the O-ring is cracked, flattened, or feels hard, replace it.
- Take the old O-ring to the hardware store to match size.
- Lubricate the new O-ring with silicone grease.
- If there is no O-ring, tighten the packing nut gently (1/8 to 1/4 turn) with a wrench.
- Reassemble and test.
Fix: Leaking from Under the Faucet (Base of Spout)
Water dripping from where the faucet meets the sink means the mounting nuts underneath are loose or the rubber gasket has failed.
What causes this:
- The faucet has worked loose over time.
- The rubber or foam gasket between faucet and sink has compressed or cracked.
How to fix:
- Clear everything out from under the sink.
- Use a flashlight to look up at the underside of the faucet.
- You will see large plastic or brass nuts holding the faucet to the sink.
- Tighten these nuts by hand, then give them a gentle quarter turn with a wrench (basin wrench is ideal, but pliers can work).
- If tightening does not stop the leak, the gasket has failed.
- You will need to remove the faucet completely and replace the gasket or apply a bead of plumber’s putty (for metal sinks only — not for granite or quartz).
For granite or quartz sinks: Use clear silicone caulk, not plumber’s putty. Putty can stain natural stone.
Comparison: DIY Fix vs. Call a Plumber
| Leak Type | DIY Time | DIY Cost | Plumber Cost | Should You DIY? |
|---|---|---|---|---|
| Dripping spout (cartridge) | 30-45 min | $10-30 | $150-250 | Yes |
| Dripping spout (compression) | 20-30 min | $3-10 | $150-250 | Yes |
| Leaking handle base | 15-20 min | $2-5 (O-ring) | $150-200 | Yes |
| Leaking under faucet | 30-60 min | $5-15 (gasket or putty) | $150-300 | Yes |
| Cracked faucet body | N/A | N/A | $300-600 (new faucet + install) | No — replace faucet |
| Frozen or broken supply valve | 60+ min | $10-20 (valve) | $200-400 | Maybe (moderate skill) |
What If the Water Supply Valves Are Stuck?
You turn the valve under the sink, and nothing moves. It is frozen from years of not being used.
Do not force it. You can break the valve, causing a geyser of water under your sink.
What to do instead:
- Turn off the main water valve for your house.
- Open the faucet to drain remaining water.
- Fix the faucet leak as described above.
- After reassembly, turn the main water valve back on.
- Plan to replace the stuck supply valves soon (or call a plumber for this job).
To prevent stuck valves: Turn them off and on once every six months, even if you do not have a leak. This keeps them moving freely.
Preventing Future Leaks
A little maintenance goes a long way.
Every 6 Months
- Turn the water supply valves off and on a few times to keep them moving.
- Look under the sink for any signs of moisture or drips.
- Check the aerator (the screw-on tip of the spout) for mineral buildup.
Every 2-3 Years
- Replace the rubber washers in compression faucets before they fail.
- Clean mineral deposits from the aerator (unscrew, soak in vinegar overnight).
What Shortens Faucet Life
| Habit | Why It Is Bad |
|---|---|
| Using excessive force to turn handles | Strips internal parts, cracks cartridges |
| Ignoring small drips | Mineral deposits build up and damage seals |
| Using abrasive cleaners on faucet | Wears away protective finish, leads to corrosion |
| High water pressure (above 80 psi) | Puts constant strain on all seals and cartridges |
FAQ: Leaky Kitchen Faucet Questions
Why is my brand new faucet already leaking?
A new faucet should not leak. Either it was installed incorrectly (cross-threaded or overtightened), a part was defective, or your water pressure is too high (above 80 psi). Check the installation first.
Can I use Teflon tape on faucet threads?
Teflon tape is for threaded pipe connections (like shower arms or supply lines). Do not use it on cartridge seals, O-rings, or washers. Use silicone plumber’s grease instead.
Why does my faucet leak only when I turn it on, not when it is off?
That is not a leak — it is a loose spout or aerator. Tighten the spout collar or the aerator at the tip of the faucet by hand.
How do I know if I need a new faucet instead of a repair?
Replace the entire faucet if the body is cracked, the finish is corroded beyond cleaning, or replacement parts are no longer available (common for faucets over 15-20 years old).
Is it safe to leave a dripping faucet for a few days?
It is safe but wasteful. A fast drip can waste 50+ gallons per day. Place a bucket under the drip to catch water and use it for plants if you cannot fix it immediately.
Why is water leaking from the handle when I turn the faucet on?
The O-ring or packing nut has failed. Water is escaping around the stem instead of going through the spout. Follow the “Leaking from the base of the handle” fix above.
What is the weird mineral buildup on my faucet tip?
That is limescale or calcium deposits from hard water. Unscrew the aerator (the tip of the spout), soak it in white vinegar overnight, scrub with an old toothbrush, and screw it back on.
Putting It All Together
A leaking kitchen faucet is one of the easiest home repairs you can do yourself. Start by identifying your faucet type — cartridge, ceramic disk, ball-type, or compression. Then turn off the water, remove the handle, pull out the old internal parts, and replace them with matching new parts.
Always turn off the water supply before disassembling any faucet. Test for leaks before walking away.
The whole job takes less than an hour and costs under $30 for most faucets. You will save money on your water bill, avoid water damage to your cabinets, and feel a real sense of accomplishment every time you turn on your now-dry faucet.
The hardest part is usually getting the handle off. Take your time. Take photos. And if you get stuck, your local hardware store plumbing department can almost always help you identify the right part.
Which kitchen problem do you want solved next? Share your thoughts in the comments.
References:
