If you have a faucet with 2 handles for hot and cold remove each handle remove the nut with a wrench pull out the stem and replace the seat washer to fix the leak.
Bathroom water leak sink.
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To fix your leaking faucet turn the pipes below the sink to turn off the water and plug the drain with a rag.
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Insert a sink stopper or cover the sink opening with a towel to prevent any tools from falling down the drain as you make your repairs.
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3 the nut may not be tight enough and water is simply coming through.
Investigate appliances and fixtures.
Step 1 inspect the leaks.
If the water meter test indicates a leak inside your home check the cabinets under the kitchen laundry and bathroom sinks to make sure they re dry.
Bathroom sink leaks are usually caused by a bad drain pipe loose pipe connection or leaky sink drain flange.
4 the drain pipe is off center and therefore.
It can be directly under the faucet or the handles.
If the sink rim is caulked scrape away the old caulk and recaulk.
How to fix it.
If there is a set screw behind the handle insert a hex key or allen wrench into the screw and turn it to remove.
For trap leaks turn on the water in the sink while checking the drain trap beneath for drips.
Tighten the clips under the sink rim that clamp the sink to the countertop.
1 water may leak in between the threads on the nut and the drain pipe if no plumbers tape was applied.
Bad sink drain flange step 1 shut off the water to the house.
Tighten the faucet base by turning the mounting nuts underneath it.
For water supply leaks run your fingers over the lines to find out which one is damp.
Turn off the faucet but not the water supply.
2 the rubber sealing washer or o ring may be squeezed excessively tight causing leakage.
Fill the sink with water and determine where your particular leak is located.
What could be the cause of the water leak under the sink.
Dribble water around the sink rim and look for leaks photo.