Call before it spreads
- Water or staining appears under a sink.
- A supply line, shutoff valve, or fixture connection feels damp.
- A faucet drips after being shut off.
- The cabinet smells musty or the bottom has begun to swell.
- A small visible leak returns after being wiped dry.
What to do now
If water is actively escaping, use the nearest working shutoff valve and dry the area. Move stored items out of the cabinet. If you cannot stop the water safely, use the home's main shutoff and call for help.
Know when the problem is bigger
Hidden wall, slab, underground, or major line leaks require specialized diagnostics and may require a licensed plumbing contractor. JT is direct about scope and will tell you when a specialist is the correct call.