Bathroom sink leaks are usually caused by a bad drain pipe loose pipe connection or leaky sink drain flange.
Bathroom water leak sink.
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.
Investigate appliances and fixtures.
Underneath the sink check where the leak comes from.
Dribble water around the sink rim and look for leaks photo.
Step 1 inspect the leaks.
It can be directly under the faucet or the handles.
Bad sink drain flange step 1 shut off the water to the house.
Turn off the faucet but not the water supply.
Tighten the faucet base by turning the mounting nuts underneath it.
What could be the cause of the water leak under the sink.
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.
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1 water may leak in between the threads on the nut and the drain pipe if no plumbers tape was applied.
2 the rubber sealing washer or o ring may be squeezed excessively tight causing leakage.
3 the nut may not be tight enough and water is simply coming through.
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4 the drain pipe is off center and therefore.
2 remove the handle how you remove the handle depends on your faucet type.
For water supply leaks run your fingers over the lines to find out which one is damp.
Tighten the clips under the sink rim that clamp the sink to the countertop.
If the sink rim is caulked scrape away the old caulk and recaulk.
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.
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Fill the sink with water and determine where your particular leak is located.
How to fix it.
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If there is a set screw behind the handle insert a hex key or allen wrench into the screw and turn it to remove.