Your sink's supply lines run from the water supply valve to the faucet supply tube. The faucet supply tube is the one that connects to the faucet. If something happens to the supply line, you may be able to fix it yourself with just a little time and a few tools. Follow the advice offered in this article to take care of the problem yourself:

Tip: Have a bucket to catch leaking water and a thick towel to lean on.

Locate the leak—The first thing you need to do is find out exactly where the leak is at. This may not be as easy as you would expect. The water will come out from the leak and travel down the line, making it difficult to pinpoint the exact place of exit.

The easiest way to determine the exact location of the leak, you want to check the connections. If the leak is coming from the connections, you can simply tighten them and this should fix the leak.

If it's not the connections, wipe the entire pipe dry and wrap paper towels around the line. Remove the paper towel a few inches from the line and look for the highest wet mark. This will be the point of the leak.

Fixing the leak—To fix the leak, you want to shut off the water supply from the supply valve under the sink. Take off the nut from the supply line and add some plumber's tape to its threads. Put the nut back in place, making sure to hand tighten it securely. This should take care of the problem. If it doesn't, then it indicates the need for an entirely new water supply line.

If you need to replace the water supply line, you will remove the line and take it to the hardware supply store to match it to a new one. If you have a hard time removing the line, you may want to use a basin wrench for the job. Once you have the new supply line, install it the same way the old one came out. Make sure your connections are nice and tight. Turn the water supply back on and let the water run for a few minutes while you watch for leaks.

If you are still having problems at this point, then it may be time to call out a professional plumber, like Action Plumbing Heating & Air Conditioning Inc. Otherwise, congratulations on repairing your sink's supply line leak all on your own.