Water Under the Kitchen Sink: What to Do
You open the sink cabinet and find a puddle, a wet cabinet floor or a slow drip coming off the pipes. Here is what it usually means, whether it is an emergency and what to do now. One call connects you with a local crew, any hour.
Water under the kitchen sink usually comes from a loose or worn supply line, a leaking drain joint, the garbage disposal or the dishwasher hoses that pass through the cabinet. A steady drip is urgent but manageable; a spraying line is an emergency. Turn off the shutoff valves under the sink, catch the water and empty the cabinet. If the cabinet floor is soft or water reached the floor or the room below, one call connects you with a local crew.
Where This Water Usually Comes From
- Most common
Loose or worn supply line
The flexible lines running from the shutoff valves to the faucet are under constant pressure, so they drip even when nobody is using the sink. If the wet spot is near the back wall and stays wet with the faucet off, a supply line or its valve is the likely source.
- Cause 2
Leaking drain or trap
Drain joints only leak while water is flowing, so this shows up after you run the tap or empty a pot. Run the faucet for a minute with a dry paper towel under the trap and the slip joints, and a damp towel points to the drain.
- Cause 3
Garbage disposal
A cracked disposal body, a worn seal at the sink flange or a loose drain connection leaks when the disposal runs or the sink drains. Water collecting on the bottom of the unit itself, rather than on the pipes, is the giveaway.
- Cause 4
Dishwasher hoses in the cabinet
The dishwasher supply line and drain hose usually run through the sink cabinet. If water appears only during or right after a dishwasher cycle, the hose connection at the disposal or the drain is the most likely cause.
Is It an Emergency?
Call now if
- Call now if water is spraying or running and the shutoff valves under the sink will not stop it.
- Call now if water has reached an outlet, a power strip or the wiring for the disposal.
- Call now if the ceiling below the kitchen is stained, dripping or bulging.
- Call now if the cabinet floor is soft, swollen or coming apart in layers.
- Call now if the leak began when a pipe thawed after a hard freeze, because more pipe may be split inside the wall.
It can usually wait a few hours if
- It can usually wait a few hours if the drip is slow and the valves stopped it.
- It can usually wait a few hours if only the bottom of the cabinet is damp and the floor in front of it is dry.
- It can usually wait a few hours if nothing is wet in the basement or room below.
- It can usually wait a few hours if a pan is catching what is left and you keep checking it.
Still call today: hidden moisture keeps spreading while it waits.
What to Do Right Now
- 1Turn off the valves under the sink Turn both small shutoff valves clockwise until they stop. If they are stuck or still leak, close the main shutoff for the house, usually where the water line enters the basement.
- 2Shut off power to the disposal Unplug the disposal or turn off its breaker before reaching into a wet cabinet. Keep cords and power strips out of any standing water.
- 3Empty the cabinet Take out cleaning products, bags and the trash can so the cabinet floor can breathe. Wet cardboard and paper hold water against the wood.
- 4Soak up and catch the water Towel up the puddle, set a shallow pan under the drip and leave the cabinet doors open. A small fan pointed into the cabinet speeds things up.
- 5Check below the kitchen Look at the basement ceiling or the room below for drips, stains or a damp smell. Water often travels down along the drain pipe where it passes through the floor.
- 6Take photos Photograph the wet cabinet, the pipes and any stains before you clean up. Pictures help the crew see how far the water went and how long it was running.
How a Crew Finds the Source and Fixes It
A crew starts with a moisture meter on the cabinet floor, the cabinet sides and the floor in front of the sink, then checks the wall behind the cabinet and the ceiling or basement below. Thermal imaging shows cooler wet areas through the cabinet back and the drywall without tearing anything open. If the cabinet floor reads wet underneath, they may lift or cut out only the bottom panel to reach the subfloor, which is often wetter than the cabinet itself because water has been running behind the toe kick for days or weeks before anyone opened the doors.
The fix depends on what got wet. A plumber repairs or replaces the leaking line, drain joint or disposal, and the restoration crew dries the cabinet box, the subfloor and the wall cavity with dehumidifiers and air movers, sometimes drilling small holes at the base of the cabinet to push dry air in. A cabinet floor that has swollen, delaminated or started to rot usually needs replacing, while the rest of a base cabinet can often be saved if only the bottom panel failed. Readings are rechecked each day until the materials are dry.
- 1
Meter the cabinet
The crew reads moisture in the cabinet floor, sides, back wall and toe kick, then checks the subfloor and the ceiling or basement below the sink.
- 2
Stop the source
A plumber fixes the supply line, drain joint or disposal so no new water reaches the cabinet while drying equipment runs and readings start to fall.
- 3
Open only what is needed
If the subfloor reads wet, the crew lifts or cuts the cabinet bottom panel to expose it, leaving the countertop, sink and cabinet face in place.
- 4
Dry the cabinet box
Dehumidifiers and air movers run around the cabinet, and air can be pushed into the toe kick space through small holes so trapped moisture under the box escapes.
- 5
Confirm and rebuild
Daily meter readings confirm the wood and drywall are dry, then a new cabinet floor, a patched wall or a replacement base cabinet goes back in.
How to Keep It From Happening Again
- Replace old supply lines. Swap aging sink supply lines for new reinforced ones whenever you replace the faucet. Turn the small shutoff valves once a year so they still close when you need them.
- Open the cabinet doors in a cold snap. If the sink sits on an exterior wall, the Red Cross advises opening the cabinet doors so warm house air reaches the pipes during cold snaps.
- Put a leak alarm in the cabinet. A small battery water alarm on the cabinet floor sounds the moment it gets wet, long before the wood swells.
- Keep the cabinet floor visible. A quick look under the sink once a month is easy when the cabinet is not packed to the doors. Watch for drips on the trap and stains on the panel.
- Watch the water meter. With every faucet off, a moving meter dial means water is running somewhere. EPA WaterSense estimates about 10% of homes have leaks that waste 90 gallons or more a day.
What It Costs
A leak detection visit runs $150 to $500, and drying a wet cabinet and the floor around it is often priced at $3 to $7.50 per sq ft. A small one-room cleanup lands between $1,200 and $4,000, and repairing or replacing a water-damaged base cabinet runs $1,500 to $6,000. Water that reached the ceiling below and how long the leak ran move the price most. General market ranges, not quotes.
How Long It Takes
A cabinet and subfloor caught early usually dry in 2 to 4 days with dehumidifiers and air movers. Replacing a cabinet floor or a base cabinet adds a few days to a couple of weeks, depending on parts.
Call (203) 555-0163Water Under the Kitchen Sink in Connecticut
Under-sink leaks are common across Connecticut because so much of the housing is old: the state median year built is 1967, compared with 1981 nationally, and older homes mean older supply lines and drains. In Hartford County, the swing at Bradley on December 23 to 24, 2022, from a high of 59 degrees F to a low of 7 degrees F, is the kind of fast freeze that splits a sink line on an exterior wall. New Haven County has city kitchens in housing with a median build year of 1950 in New Haven itself, and in Litchfield County many hill towns rely on private wells, where a pump keeps feeding a leak until someone shuts it off.
When you call (203) 555-0163, you describe what is under the sink, whether the valves stopped it and whether anything below is wet. We connect you with a local restoration pro who serves your town, and the crew talks through timing and next steps with you on the phone before anyone comes out. This line takes calls only, so phoning is the quickest way to get a crew moving.
Water Under the Kitchen Sink FAQs
Why is there water under my kitchen sink when the faucet is off?
If the cabinet gets wet with nothing running, the leak is on the pressurized side: a supply line, a shutoff valve or the faucet connection. Drain leaks only drip while water is flowing. Close the valves and see if it stops.
Can I keep using the sink if it only drips a little?
You can if the leak is on the drain side and a pan catches it, but every use adds water to the cabinet floor. A supply-side drip runs all day, so keep the valves closed until it is repaired.
Is a swollen cabinet floor under the sink ruined?
Swollen particleboard rarely returns to its old shape and usually has to be replaced. The cabinet box and doors can often be saved if the subfloor and sides are dried properly.
How do I know if water got under the cabinet?
Check the floor in front of the toe kick for staining or lifting, and look at the ceiling or basement below. A moisture meter reading taken by a crew is the reliable way to know.
How much does it cost to fix water damage under a kitchen sink?
A leak detection visit is about $150 to $500, and drying plus repairs for a small kitchen area often fall between $1,200 and $4,000. Replacing a base cabinet adds $1,500 to $6,000. General market ranges, not quotes.
Who do I call about water Under the Kitchen Sink in Connecticut?
Call (203) 555-0163 any time. Calls are answered 24/7 in Fairfield County, Hartford County, Litchfield County, Middlesex County, New Haven County, New London County, Tolland County, Windham County, and you are connected with a local crew that can find the source and dry it out.
Other Kitchen Problems
- Water Leaking From the DishwasherWater seeps out under the dishwasher door or the front panel during a cycle or right after it finishes.
- Water Pooling Behind the RefrigeratorThere is a puddle by the refrigerator or water creeping out from underneath it, and nobody spilled anything.
- Kitchen Floor Buckling or SoftThe kitchen floor is cupping, lifting at the seams, buckling up or feels soft and spongy underfoot.
Water Under the Kitchen Sink? Call Now.
Calls answered 24/7. One call connects you with a local crew to find the source and start drying.