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Why Is My Kitchen Faucet Leaking From the Base?

A kitchen faucet leaking from the base is usually a worn o-ring or loose mounting nut. Tighten the nut or replace the o-ring to stop the drip.

Category:Plumbing
Difficulty:Moderate
Time:30 min
Success:50%
Updated:Jun 3, 2026

quick_referenceQuick Answer

For Why Is My Kitchen Faucet Leaking From the Base?, start with "Tighten the mounting nut under the sink": Place a bucket under the sink. Use a basin wrench to reach the mounting nut behind the sink bowl. Turn it clockwise to tighten. Wipe away any water and check for leaks. Stop DIY if the faucet body is cracked or corroded. This is listed as a moderate recovery and usually takes about 30 min.

verifiedGuide Snapshot

Repair areaPlumbing
Estimated time30 min
DifficultyModerate
Stop conditions3

Last updated Jun 3, 2026. Review the stop conditions before continuing.

account_treeRecovery State

DeviceKitchen Faucet
Current stateLeak
Specific stateBase Leak
Failed stepO Ring Wear
Likely failure typeWorn Part
DIY boundaryDIY recovery first
paymentsCost decision

help1. Understand the Problem

Water pooling around the base of a kitchen faucet indicates a seal failure. The o-ring that seals the spout to the faucet body can wear out over time. In some cases, the mounting nut may have loosened, allowing water to seep through.

build_circle2. Try This First

Best First Step
Tighten the mounting nut under the sink

Tighten the mounting nut under the sink

Place a bucket under the sink. Use a basin wrench to reach the mounting nut behind the sink bowl. Turn it clockwise to tighten. Wipe away any water and check for leaks.

visibility3. Visual Guidance

See what's happening and how to try the first recovery step.

1
Remove the handle and spout
Remove the handle and spoutTurn off the water supply. Pry off the handle cap and remove the handle screw. Lift the handle off. Unscrew the spout retaining ring and pull the spout upward.
2
Replace the spout o-ring
Replace the spout o-ringRemove the old o-ring with a pick or small screwdriver. Clean the groove. Lubricate the new o-ring with plumber's grease and press it into place. Reassemble the spout.
3
Test for leaks
Test for leaksTurn the water supply back on. Run the faucet and check the base for any dripping. If it still leaks, the cartridge may need replacement.

autorenew4. If That Doesn't Work

Try the next recovery options.

Tighten the mounting nutAccess the nut under the sink using a basin wrench. Tighten it clockwise to secure the faucet base.
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Replace the spout o-ringRemove the handle and spout. Locate the o-ring and replace it with an identical one from a faucet repair kit.
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Replace the cartridgeIf leaking persists after o-ring replacement, the cartridge may be faulty. Remove and replace with a matching cartridge.
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Frequently Asked Questions

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warning5. Stop DIY If

Don't continue if any of these apply.

reportThe faucet body is cracked or corroded
reportYou cannot reach the mounting nut due to limited space
reportThe leak continues after replacing the o-ring and tightening the nut
Still stuck?Get personalized help with AI Recovery.

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Similar Failure Pattern

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This page provides general DIY guidance.
If you're unsure, it's always best to consult a professional.