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Question DetailsAsked on 12/15/2014

I have water on my kitchen sink cabinet floor; doesn't seem like the water is coming from sink or the pipes above.

This is a double sink and the water is mostly on the left side. I checked all the fittings, joints, hose and pipes for leak and cannot locate where the water is coming from. The floor of the cabinet is always wet, especially in the mornings. I am at a lost. Had new plumbing, sink and cabinets installed two years ago. Did not change the plumbing in the wall/ floor which looked to be in really good condition because we had to open up the wall.

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1 Answer


Because it is wet in the morning, I am guessing possibly a leaking trap joint - but more likely a leak in the faucet itself, or in the flex tubing to the faucet or at the shutoff valve for the sink or dishwasher. Since you say you checked all pipes and fittings, I am guessing a shutoff valve or a gasket leak in the faucet itself or loose connection at spray nozzle is likely your case.

To track it down - take everything out from under the sink (be SURE to keep hazardous/ poisonous/ breakable things out of reach of kids and pets), and with paper towels or rag completely dry off the "floor" under the sink, ALL piping, garbage disposal, fittings to sink drain, and along the flex tubing up to the underside of the faucet and spray nozzle. pay attention as doing this - you might find the wet source of the leak right off while doing this.

Then put a couple layers of paper towels over the entire bottom of the undersink area - be careful especially near where pipes meet basin drain as there might be sharp metal edges there. Check every hour or two to start, if no sign of wetness then let sit overnight.

Drips will show as wet spot on paper towels (use paper, not bath towel or rags as they soak up the water too welland wick it throughout the towel so you can't isolate the drip spot), or if not much of a drip, as a wrinkled damp area in the paper towel. Then look directly above that, running bare hands (keeping clear of electrical outlet) over all piping and garbage disposal, starting from lowest points up. Once you hit wetness, then dry hands, and start from top down on that pipe to find highest wet spot - your leak is there. You may actually find several if older piping.

If you find wet spot in paper towel but no wet pipe above it, shine flashlight up under the back side of sink - look for drips (may even have small tan or brownish or green stalactite of mineral buildup hanging down) at the holes in the countertop where the piping to the faucet and the spray nozzle and the dishwasher air vent go through.

Common sources in no particular order - trap joints, worn through garbage disposal grinding chamber leaking through the outside casing, leaking dishwasher discharge hose connection at piping or garbage disposal, overflowing dishwasher air vent due to blocked dishwasher discharge hose, leaking valve stem at faucet/dishwasher water shutoff valves (usually 3 under there - 4 if water purifier or instant hot water unit there too), corroded flex tubing or tubing fittings, leaking seals in faucet or spray nozzle causing drip from bottom of them. If occurring when NO water is being run, then the air gapper and dishwasher hose fittings may be clear unless standing water in the looped tubing is leaking out at a fitting, and spray nozzle would be out because (unless independent of faucet) as it is not usually pressurized unless the faucet is turned on.

Of course, if you run water initially and it starts dripping, then you are looking for a leak in the sink or somewhere along the drain piping, or at the faucet/spray nozzle.

By tracking wetness and using a good flashlight to look for glints of wetness (with kitchen lgiths off) usually only takes 5 minutes or less to find problem. Then - may be loose fitting you can fix, or may be a plumbing issue you may be able to DIY, or may be corroded shutoff valve or worn-through garbage disposal that needs new washers and seals or replacement, which is beyond most homeowners and calls for a Plumber.

Answered 5 years ago by LCD

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