Mold Under Sinks & In Kitchens
Under-sink cabinets are one of the most common places to find mold in a home because a slow supply or drain leak can run for months inside an enclosed, unventilated box before anyone opens the door and looks.
Signs to look for
- Staining or warping on the cabinet floor
- A musty smell when the cabinet is opened
- Soft or delaminating particleboard
- Rippling or lifted flooring in front of the sink
- Visible corrosion on shut-off valves
What usually causes it
- Slow drain or P-trap leaks
- Supply line or shut-off valve weeping
- A failed sink rim seal letting water under the counter
- Dishwasher supply and drain connections
- Condensation on cold supply lines in summer
Removing the growth without eliminating the water source simply resets the clock. Every report we write identifies the moisture source, because that is the finding that determines what it actually costs you to fix.
How we investigate it
Locate the moisture
Thermal imaging and moisture meters map the full extent of wet material, including behind finishes.
Establish the source
Groundwater, plumbing, condensation and ventilation failures all look similar at the surface and need completely different fixes.
Sample if it changes the plan
Air sampling with an outdoor control where growth is hidden; surface sampling where it is visible.
Document and hand off
A written report you can hand to a contractor, an insurer or a landlord — and independent clearance testing afterwards.
Related
Common questions
What causes mold under sinks & in kitchens?
Slow drain or P-trap leaks; Supply line or shut-off valve weeping; A failed sink rim seal letting water under the counter.
How do I know if I have mold under sinks & in kitchens?
Staining or warping on the cabinet floor; A musty smell when the cabinet is opened; Soft or delaminating particleboard.
Can I clean it myself?
Under roughly ten square feet with a known, corrected water source, most homeowners can clean it safely with gloves, an N95 and good ventilation. Above that, or where HVAC is involved, where the water was contaminated, or where someone in the household is immunocompromised, containment matters because disturbing growth spreads it through the building.
Will it come back after cleaning?
Yes, if the water source is still there. This is the single most common reason people call us twice. Cleaning removes what has grown; only correcting the moisture stops it regrowing.
Do I need a lab test for this?
Not always. If growth is visible and the cause is obvious, a laboratory result rarely changes what you should do. Testing earns its cost when the source is hidden, when documentation is needed, or when you want to verify a remediation job.
Get a straight answer about your building
We test, document and verify. We never sell remediation, so we have no reason to find a problem you do not have.