If your bathroom sink drain is leaking around threads or your vessel sink is leaking onto the countertop you may be able to fix it yourself. First thing you should do when your sink drain is leaking is to grab an adjustable wrench and take a look at the nut underneath the sink. Pedestal Sink Vs Vanity Which Is Right For You J Blanton Plumbing Open up cabinet doors if present.Why is my pedestal sink leaking. Pedestal sinks come in two partsthe sink basin and the stand or pedestal. The pedestal hides the plumbing provides. My sink is stupidly tiled in. 1 Water may leak in between the threads on the nut and the drain pipe if no plumbers tape was applied. Pedestal sinks are real space savers in small spaces such as half baths. Bathroom sink leaks are usually caused by a bad drain pipe loose pipe connection or leaky sink drain flange. A leak from the drain line is a little tougher to diagnose since you wont be able to see where the leak is coming from until you actually use the sink. If its the color of what you put into the drain its the p-trap. I even went exchanged the faucet for a new one and. Friction from continual use can cause the washers to wear out. Use your wrench to test the how tight the seal is. The difficult issue with pedestal sinks when you need to repair or remove plumbing is that the plumbing tubing and PVC drain is hiding behind the pedestal. 5 years ago Reply Upvote. If this happens to the valves and washers holding your...