How do I fix a leaky kitchen faucet from under the cabinet?

NOTE: Turn off the water and drain the pipes into a bucket before attempting any fix!

It depends on why/where it’s leaking. If it’s leaking around a joint, you might be able to fix it by just tightening the joint up, or taking the joint apart, applying plumber’s tape, and screwing it back together.

If it’s leaking from the area where the sink meets the drain, you can take it apart and put plumber’s putty under the flanges, and put it back together.

If it’s leaking because there is rust/a hole in a pipe, that’s a much bigger problem.

Can you tell specifically where the leak is?

I don’t know terminology and stuff…It’s a double sink, it’s the pipe that’s under the garbage disposal side of the sink. Sorry if this is confusing, I’m really not tech or repair savvy.

@augustlan‘s idea is good. Try to figure out if there is a hole in a pipe (not that likely) or the leak is where a pipe meets another pipe or the disposal or the sink.

Are the pipes metal or plastic?

To repair a leaking joint on metal pipes you will need a pipe wrench or a very large pair of pliers that has an opening big enough to get a tight grip on the parts you’re working with, plus the plumber’s tape…

Plastic is another ball game, take a look at ehow.com for some walk-throughs on plastic pipe repair.

There are only a few reasons this could be leaking. One is the drain pipes and the connections. Easy fix there just tighten them with a channel locks wrench. The other is the water supply lines but that should be pretty obvious that they are dripping water and if they are again just tightening the nuts with an adjustable wrench often can stop the leak.

Other less obvious reasons are the disposal unit connections are not tight and or clogged and that will blast copious amounts of water all over the place. Here again check all the connection and tighten the band straps with a screw driver if they are loose. Two other reasons would be a spray faucet. Mine in fact was leaking where the handle attached to the hose and was dripping a lot of water underneath that I was not aware of. I had to replace the washer in the handle. The other but unlikely reason would be the seal of the sink basin itself.

I would check the drain pipes first, water supply lines second and disposal third. Search youtube for all sorts of how to fix videos.

In all seriousness, and with the best will in the world I’m going to tell you “have someone else do it.”

From your follow-up description it sounds like it’s the drain that’s leaking, and not the water supply.

If this is the case, it’s a very simple fix (usually, assuming unbroken pipe and joint pieces), but if you’re not going to get closer to it to even see what is wrong, then you’re not going to discover the actual problem or make the fix right.

But it’s probably just a loose PVC (plastic) fitting on the base of the garbage disposal unit, or the joint to the trap or pipe itself.

You need to get your hands dirty and you need to get close and look. You will get wet and dirty.

@augustlan‘s first response to shut off the water supply and “get a bucket” and drain the full lines / sink / whatever before starting is excellent advice.