If there aren t individual shutoff valves.
Valve under kitchen sink leaking.
Twist the valve under your sink to turn off the water supply valve or valves.
A leak coming from the faucet is easy to spot since water often pools up around it when the sink is turned on.
If the water stops leaking the packing nut was the problem.
Replacement of the valve is the only fix in.
If the water continues leaking the packing nut or the valve fixture has been compromised.
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If your water supply valve is leaking you may not need to replace it.
Each time you use the faucet the washer is pressed against the valve seat.
However calling a plumber can be expensive.
Turn on the faucet and leave open allowing the remaining water in the line to empty into the sink.
Alternatively it could leak water under the sink meaning you ll only notice the leak if you look under the counter while the faucet is on.
There s an easy way to fix it and you may want to give it a try.
Don t use any pipe dope or plastic tape on the valve stem s threads.
The constant friction results in the washers wearing out by which time you will start noticing leaks around the spout.
Take the valve to your local home improvement store or go on.
If the valve leak persists turn off the main water shutoff valve then disconnect the valve and replace it.
Required tools for this project.
Avoid gumming up the inside of the shutoff valve.
Some water should come out so be prepared.
Ignoring minor leaks can waste up to three gallons of water every day and can also lead to permanent water stains and rot under your sink.
The shut off valve under a sink can go unattended for years without giving any problems but once it starts leaking it can lead to a mess quickly.
The kitchen faucet leaking under the sink is a fairly common issue.
A worn out washer is among the most common causes of leaking sinks.
Reassemble the shutoff valve turn the main house valve back on and check for leaks.
If you do have to replace the water supply valve under your kitchen sink.
Sink leaks caused by worn out washers can be fixed by simply replacing the washer.