I found a small leak under my bathroom sink. Can I fix it myself?

Small leaks under bathroom sinks can often be fixed by homeowners if they're coming from loose connections, but the approach depends on exactly where the leak is located.

Start by identifying the leak source with a flashlight. Most bathroom sink leaks occur at three common spots: the supply line connections where water lines connect to the shut-off valves or faucet, the P-trap connections where the curved drain pipe connects, or the faucet tailpiece where the faucet connects to the drain assembly. If water is dripping from these connection points, you can often fix it by gently tightening the nuts with a wrench - but be careful not to overtighten, as this can crack fittings or damage threads.

Before starting any work, turn off the water supply using the shut-off valves under the sink (turn clockwise). If the leak is from a loose supply line connection, try tightening the compression nut about a quarter turn. For P-trap leaks, the slip nuts can usually be hand-tightened or gently snugged with pliers. However, if you see water coming from within the pipe walls, corroded fittings, or if tightening doesn't stop the leak, this indicates a more serious problem requiring professional repair.

In Ottawa's older homes, bathroom sink plumbing often has original fixtures that can be brittle. What seems like a simple tightening job can quickly turn into a bigger repair if old fittings crack or if you discover the leak is actually coming from inside the wall. Additionally, if you're not comfortable working under the sink or can't clearly identify the leak source, it's worth having a professional take a look.

Turn the water back on slowly after making any adjustments and monitor the area for 24 hours to ensure the leak is completely stopped. If the problem persists or you discover any signs of water damage to the vanity or surrounding area, contact a licensed plumber to prevent more extensive damage. For a free assessment of your bathroom plumbing, Ottawa Pro Plumbing can help identify whether it's a simple fix or part of a larger issue.

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