Leak under the kitchen sink

What you're probably seeing

Water in the cabinet, a warped cabinet floor or a musty smell under the sink.

Likely causes

• Loose slip nuts on the drain trap.
• A failing supply line or shutoff valve.
• A worn faucet base seal.
• A dishwasher or disposal connection leak.

Safe checks you can do now

1. Dry everything, then run water and watch where drips start.
2. Hand-tighten trap nuts.
3. Close the shutoff valves if a supply line is dripping.

When to call a pro

You can't find or stop the leak, or the cabinet floor is soft.

General information about common causes, not a diagnosis of your home.