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Question DetailsAsked on 2/24/2016

plumber replaced kitchen drain pipe. When you turn on kitchen sink water is running out underthe cabinets

Water on the kitchen floor plumber said dishwasher is the problem. He ran dishwasher and the water was on the floor under cabinets . I was going to order a new dishwasher. However, at the same time he noticed kitchen drain pipe was leaking, he replaced the pipe. If you run the water in the sink, the water from the sink is leaking out underneath the cabinet. How do we know if this is
the dishwasher repair or the supply line? Have not used dishwasher in a week, Every time we run the water in the
sink the water is pouring out underneath the cabinets. Plumber said the doesn't know what to do. If the dishwasher and sink empty in to the same line, can't the line be clogged?

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3 Answers


If water pours out when you are NOT using the dishwasher, unless running continually (like due to a broken feed line to the dishwasher or leakk at the dishwasher), then your plumber is incompetent. Since you say it leaks out ONLY when running water in the sink, not all the time and not when using dishwasher - so clearly has to be in the drain lines from the sink or the garbage disposal has corroded/worn though and is leaking.

If you run the water a bit and look in under the sink with a flashlight you should be able to see where the water is coming from - could be he forgot to hook the dishwasher discharge line back to its connection (commonly on side of garbage disposal), failed to tighten down a connection, cracked a connection (or missed a bad pipe or joint), or maybe left the bevel O ring out of one of the joints (or put it in backwards).

About only way dishwasher could be involved is

1) if the discharge line from it (usually clear or white corrugated flex tubing) comes off low from the garbage disposal AND stays low all the way to the dishwasher AND is leaking due to a crack, bad connection, etc so it gets water from inside the garbage disposal when that sink is used and backs up to the dishwasher, or

2) discharge line stays below water level in the sink for its entire run, the air gapper is under the sink and below the water level in the sink, and the drain pipes are clogged so it is backing up in the dishwasher drain line and coming out the air gapper (small open-top device with dishwasher drain line coming into and out of it, usually mounted in hole through back of sink or countertop but sometimes under sink on back wall).

Finding a leak of this type is far from rocket science. If not a significant leak, dry off all the piping under the sink with paper towels, then run some water, then using Kleenex or toilet paper (they show wetness better than paper towels) start at the highest point under the sink (on each side if double sink) and wipe each connection and pipe and around the air gapper and the garbage disposal, moving down joint and section by section until it comes up wet - that is a leak point.

If you line the bottom of the cabinet with paper towels before running the water a bit, where the drip shows up onthe paper towels will give you a good starting point, though remember the water can run down along the curved pipes so is not necessarily right above the wet spot. If you do this and there is NO water under the sink but is coming out on floor, then either it is backing up in the dishwasher drain line AND the drain line is cracked, or your drain line is leaking below the cabinet level - maybe where it goes into the wall.

Time to fire that plumber (and you should get your money back if he can't find a leak like this in 5 minutes or less), and get a new highly rated plumber.

Oh - and stop using the sink/dishwasher till fixed unless the drip can be contained with a bucket under there (which you remember to empty as needed), because you are going to ruin your flooring and base of the cabinets, not to mention possible water damage to back wall and any downstairs finishes and walls.

And do an appropriate AL Review on the first one.

Answered 4 years ago by LCD


Just wanted to say thank you to the person who responded.

The plumber insisted it was the dishwasher. Even after repeatedly stating the water

is running out underneath the cabinets when I use my kitchen sink on to the floor.

It wasn't my dishwasher!!! It was a crack in the pipe inside the apartment wall.

Answered 4 years ago by carolcat16


Well - glad you got it fixed. Be sure to at least run a fan or two into the undersink cabinet and dishwasher areas or a day or so to dry them out so you do not get a mold farm.

Did you ask the plumber who finally found the source of the leak whether the crack looked like due to bad joint, settlement, or frozen pipe ? If the latter, you should do something to either insulate on the outside wall facing side of the pipe, or open up the area permanently (with toekick vents or such) so the pipe cannot freeze so easily. Do NOT insulate all around the pipe - you want it to see the warmth from the house.

Or at least remember to leave the undersink cabinet doors open whenever it gets cold outside - though that is easy to forget, and of course can be dangaerous if you have the usual types of cleaners and such under there and have little ones or pets in the house.

Answered 4 years ago by LCD

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