Kitchen faucet leak troubleshooting
Leaking Kitchen Faucet? Identify the Leak Before Replacing the Faucet
A drip from the spout and water under the sink can come from completely different seals. Dry the area and identify the exact leak path first.
The quick answer
What should you do first?
Dry the faucet, sink deck, cabinet floor, and supply connections, then operate the faucet while watching for the first place water appears. A drip from the spout with the faucet off points toward an internal valve cartridge, washer, or seal depending on the faucet design. Water around a handle or base can involve O-rings or body seals. Water under the sink may come from supply hoses, shutoff valves, faucet shanks, the sprayer hose, or even the drain rather than the faucet valve. Turn off the fixture's water supply before disassembly and replace parts by exact faucet model when possible.
Start with these checks
- 01
Dry everything before testing
Wipe the faucet body, sink deck, supply hoses, shutoff valves, drain connections, and cabinet floor dry. Old moisture makes it difficult to tell where a new leak begins.
- 02
Test the faucet off, then cold, then hot
Watch the spout with the faucet off. Then run cold and hot separately while looking around the handles, base, pull-down hose, supply fittings, and cabinet. Different conditions can expose different seals.
- 03
Separate valve leakage from connection leakage
A spout that drips while shut off is usually an internal faucet-sealing issue. Water on the cabinet floor during operation may be a supply, sprayer-hose, faucet-body, or drain connection instead.
- 04
Shut off water before opening the faucet
EPA WaterSense specifically reminds homeowners to shut off the water line before faucet repair. Confirm the local stops actually hold before removing a cartridge, stem, or supply connection.
- 05
Match the service part to the faucet
Modern faucets use different cartridges, ceramic discs, seals, and proprietary assemblies. Use the model number, manufacturer diagrams, or the removed part to match replacements instead of buying a generic washer kit by default.
A spout drip is not the same failure as water under the sink
EPA WaterSense identifies worn washers and gaskets as frequent faucet leak causes, but modern kitchen faucets can also use cartridges and ceramic-valve assemblies. The useful first distinction is whether the valve fails to shut off internally or water escapes from an external connection.
If the spout stays dry when off but the cabinet gets wet only while water runs, inspect the spray hose, supply connections, faucet mounting area, and drain. Rebuilding the cartridge will not fix a leaking hose under the sink.
One drip per second can waste thousands of gallons a year
EPA reports that a faucet dripping at one drip per second can waste more than 3,000 gallons per year. The agency also identifies dripping faucets, worn toilet flappers, and leaking valves as common household leaks that are often straightforward to correct.
A shutoff valve that does not shut off changes the job
Before disassembling a faucet, close the fixture stops and confirm flow actually stops. If a shutoff valve is seized, leaking, or will not isolate the faucet, the repair boundary moves upstream. Do not remove a pressurized cartridge or supply line while assuming an old stop valve will eventually hold.
Clear answers
Common questions
Why does my kitchen faucet drip after I turn it off?
A continuing spout drip usually means the internal valve is not sealing completely. The service part may be a cartridge, washer, seal, or ceramic-valve component depending on the faucet design.
Why is there water under the sink only when the faucet is running?
Inspect the supply connections, pull-down or side-sprayer hose, faucet shank area, and sink drain. Water below the sink during operation does not automatically mean the faucet cartridge is leaking.
Do I need a whole new faucet for a drip?
Often no. Many faucets have replaceable cartridges, seals, hoses, or other service parts. Replacement makes more sense when the faucet body is damaged, badly corroded, parts are unavailable, or repair cost no longer makes sense.
Related troubleshooting
- 01
Toilet Keeps Running? Find Where the Water Is Going
A running toilet is usually a leak path or a level-control problem. Watch what the tank is doing before replacing a valve.
- 02
Dishwasher Not Draining? Trace the Drain Path Before Replacing the Pump
Standing water can be caused inside the dishwasher or downstream in the sink plumbing. Follow the water path before condemning the drain pump.
- 03
No Hot Water? Separate the Water, Power, and Heat Source
Before replacing a water heater, determine whether the problem is at one fixture, the whole hot-water system, the energy supply, or the heater itself.
Evidence
Sources and method
This guide combines a maintenance troubleshooting approach with current technical guidance from the sources below. Safety rules, manufacturer instructions, and applicable codes take priority over general troubleshooting guidance.