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Kitchen Water Damage: The Risks Under Your Sink

Last updated October 25, 2026

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The short answer

What Causes Leaks Under the Sink

The most common cause is a loose or worn supply line, often where the hose connects to the shutoff valve or faucet. A pinhole leak in a metal braided hose can spray a fine mist for weeks before you notice. Deteriorating rubber washers and cracked plastic fittings also fail over time.

Another frequent source is the drain assembly. The P-trap and its slip joints can loosen from normal use or from twisting when you reach under the sink. Grease and food debris can build up, causing slow drainage that backs up and overflows. Even a small drip from a sprayer hose can saturate the cabinet base.

How Water Damages Your Cabinets and Floor

Water that sits on the cabinet floor soaks into particleboard or plywood, causing it to swell, delaminate, and lose structural strength. The damage is often hidden until the wood starts to crumble or the cabinet door no longer aligns. Over time, the moisture can travel to the subfloor and baseboard, causing warping and staining.

If the leak reaches the flooring, you may see buckling or discoloration. Laminate and hardwood are especially vulnerable. Water can also seep under the floor covering and into the subfloor, where it can promote rot. You might notice a musty smell before any visible damage appears.

  • Check under the sink for water stains, rust, or mineral deposits
  • Feel the cabinet floor for soft or spongy spots
  • Look for warped or swollen wood around pipe openings
  • Watch for peeling paint or bubbling on the cabinet sides
  • Sniff for a musty odor that suggests hidden moisture

The Mold Risk in Dark Damp Spaces

Mold thrives in the dark, damp space under your sink. A leak that goes unnoticed for days gives mold a chance to take hold on wood, cardboard boxes, and even the drywall behind the cabinet. Mold can spread to other areas if the moisture continues.

Exposure to mold can cause respiratory irritation, especially for people with allergies or asthma. You might see black or green spots on surfaces, or you might only smell it. If you feel unwell from possible mold exposure, see a doctor. A mold professional can assess the extent and recommend safe removal.

Steps to Take Right Now

If you find a leak, shut off the water supply valve under the sink immediately. Turn the handles clockwise until they stop. Then open the faucet to release pressure and drain the lines. Place a bucket or pan under the leak to catch drips while you assess the situation.

Remove items from the cabinet and dry the area with towels or a wet-dry vacuum. Use a fan to circulate air and speed drying. If the cabinet floor is soaked, you may need to remove the base panel to let it dry. Do not try to fix the leak yourself if you are unsure; a plumber can handle the repair.

When to Call in the Pros

You can handle a small, contained leak if you catch it early and dry the area thoroughly. But if the water has soaked into the subfloor, spread to the wall, or caused visible warping, the damage may be more than you can manage. Local water damage pros can assess the extent and dry the structure properly.

They use specialized equipment to extract water from wood and drywall and to check for hidden moisture. The work usually involves removing damaged materials, drying the space, and preparing it for repairs. If you live in Burnsville, keep your shutoff valve location written down for future emergencies. The cost depends on the size of the leak, the materials affected, and how far the water traveled.

  • Water has soaked into the subfloor or wall
  • You notice a musty smell that persists
  • The cabinet wood is soft or crumbling
  • The leak has been ongoing for more than a day
  • You see mold growth that covers a large area

Talk to someone now

Phones are answered 24/7 for Burnsville and nearby communities.

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Frequently asked questions

How do I know if the leak is serious?

A small drip that you catch quickly may only need drying and a simple fix. If the water has spread to the floor, wall, or subfloor, or if you see swelling, warping, or mold, treat it as serious. Call a plumber or water damage professional to inspect.

Can I dry out the cabinet myself?

You can dry a small, contained area with towels and a fan. But if the water has soaked deep into the wood or reached the subfloor, household drying may not be enough. Pros use moisture meters and industrial dryers to remove trapped water and prevent mold.

Will my insurance cover this?

Policies vary, and your insurer decides what is covered. Some policies cover sudden, accidental water damage, but gradual leaks from wear and tear may be excluded. Review your policy and contact your insurance company to ask about your specific situation. Check your policy for details.

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