How to Repair a Leak Under the Sink

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Repairing a leak under the sink requires you to find the exact location of the leak in the first place. Repair a leak under the sink with help from a longtime construction expert in this free video clip.

Part of the Video Series: Home Sweet Home Repair
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Video Transcript

Hi. This is Nicholas Iarocci, the Home Source Guy, President and Owner of Source Development, Inc., a residential and commercial construction company in Garnerville, New York, and this is how to repair a leak under the sink. It's kind of a loaded question. There's a lot of possibilities that could lead to a leaking sink, so let's start off with the supply lines and the water supplies. Now, they're under constant pressure, so if you notice a leak that's present as a constant, meaning not so much when you actually use the sink or trap, that you can't visually see, you know it's coming from the water supply sides, which are under pressure, right? So, the first leak that we could discuss, that might be causing you a problem, is from the valve. Very often, these valve stems just get loose from contraction to expansion, from age, maybe the gaskets or the O-rings deteriorate and they have to be repacked or replaced. So, you can try tightening the retention nut on a supply valve. Another thing is that these are no-burst pipes, but you can have Ferro and nut applications, that's a solid pipe, a rigid pipe, and you might be getting leaking from that. So, you could loosen it up, apply some sealant or some silicone lube or something to try to stop that from leaking, if not totally replacing the whole system. At the faucet, where the supply tubes attach to the faucet, there's a retention nut. So, sometimes they get loose, so there's a basin wrench that you can use, or some channel locks, if you can manage it, to get up inside and give them a little tightening. So, this fits around the lock nut, and you tighten it. You could be developing a leak at the base of the faucet, or at the stem valves, valve stem, excuse me. And they could be causing a leak, which means that, you know, you'd have to get new gaskets at the faucet and stem. Another leak, possibly, is the spray. Believe it or not, if this is loose, or it's leaking here, it'll trickle down the pipe, and you know, this pipe would actually form a drip, and you'd get leakage there, and you might not be able to spot it. So, you'd wanna look at the hand spray too. Now, let's move to the drain pipes. Those would be noticed when the sink is actually used, and not a constant drip where, you know, you see dampness there all the time. This is plastic plumbing. If you had brass or copper or any form of metal, galvanized or something like that, you'd have to make sure that there's no rot present. And if there is, you'd have to replace the pipes. Essentially, if you do have plastic and you notice that it's leaking, you could just try finger-tightening it at first. And then, if not, take the joints apart. You can add sealant to them or silicone lube, plumber's grease to try to alleviate the problem. If not, you could try replacing the piping as well. The trap serves a multitude of purposes, one of which is to trap sediment at the bottom of the trap, and after time it does get clogged. So, what you want to do is actually disconnect it and empty it out. On our sink, if it is backed up, you've got water accumulating all the way up here, not to mention whatever is in the sink, so depending on how much water is there, essentially, you're going to take a bucket, put it under the trap here. And this is the P-trap. You're going to remove the retaining nuts. And if it is under pressure, you're going to start seeing water immediately start to exit as you're loosening up the nuts. So, there's two nuts on the P-trap here. You'd remove the P-trap, empty the P-trap out, and then reinstall. We're gonna reattach our P-trap. And this was how to repair a leak under the sink. This is Nicholas Iarocci, the Home Source Guy, President and Owner of Source Development, Inc., a residential and commercial construction company in Garnerville, New York, helping you build a better life. Reach out to me on Facebook at the Home Source Guy. We'll see you next time.


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