Why Is There Water Under My Sink?
Water under a kitchen or bathroom sink can come from leaking drain pipes, loose supply lines, faucet problems, clogged drains, or damaged plumbing connections. Even a small leak can eventually damage cabinets, flooring, and walls. Try these safe troubleshooting steps first. If the leak continues or worsens, Amy’s Plumbing can help.
Common Reasons Water Appears Under a Sink
Loose Supply Lines
Water supply connections can loosen over time and begin dripping slowly inside the cabinet.
Drain Pipe Leaks
Sink drain pipes and P-traps may leak from worn seals or loose fittings.
Faucet Leaks
Water from a dripping faucet can travel underneath the sink or into the cabinet area.
Clogged Drains
Slow or blocked drains can cause water to overflow or leak around pipe connections.
Step 1: Dry the Area Completely
Use towels or paper towels to dry the cabinet floor and pipes completely.
Once the area is dry, it becomes easier to identify where fresh water appears.
Check carefully for:
- Water droplets on supply lines
- Moisture around drain connections
- Wet cabinet walls
- Water stains or swelling wood
Step 2: Run the Faucet Slowly
Turn the faucet on slowly while watching underneath the sink.
Observe whether water appears:
- Immediately when the faucet runs
- Only while draining
- Near the faucet connections
- Around the drain trap
This can help narrow down whether the leak comes from supply piping or the drain system.
Step 3: Check for Slow Drains
A slow drain can increase pressure inside drain piping and contribute to leaks under the sink.
If water drains slowly or backs up, the issue may involve partial blockage inside the drain line.
Helpful related guides:
Know Where Your Main Water Shut-Off Is
If the leak suddenly worsens or a pipe bursts, shutting off water quickly can help reduce water damage.
Helpful guide: Main Water Shut-Off Valve Guide
Signs the Leak May Need Immediate Attention
| Warning Sign | Possible Concern |
|---|---|
| Cabinet floor swelling | Long-term hidden leak |
| Mold or mildew smell | Ongoing moisture problem |
| Water leaking continuously | Active plumbing failure |
| Rusted or corroded piping | Aging plumbing components |
Helpful Related Plumbing Guides
Need Help With a Sink Leak?
Try these safe troubleshooting steps first. If water continues collecting under your sink, cabinets are swelling, or pipes appear damaged, Amy’s Plumbing can help homeowners throughout Broward County and nearby South Florida cities.
Amy’s Plumbing
Florida Plumbing Contractor License: CFC1429784
Email: [email protected]