Close the valve
Under the sink.
Dishwasher supply or drain connection leaking under the sink?
Leaks at the dishwasher’s supply line, drain hose, air gap or sink plumbing are plumbing problems rather than appliance failures. Close the supply valve, dry the cabinet, then call 833-877-1717. RepairNowUSA connects the request. An independent appliance technician does the repair.
Am I in the right place?Yes for water in the sink cabinet near the dishwasher hoses, or at the air gap.
Is this urgent?Urgent if water is spreading under floors.
What do I do next?Close the valve and call 833-877-1717.
Leak inside the dishwasher itself: dishwasher leaking.
RepairNowUSA editorial review · Last substantively reviewed October 13, 2026 · Review standards
What to do now
Dry the cabinet
Empty it and dry the base.
Look for drips
At the supply fitting, drain hose clamp or air gap.
Cabinet damage
Water on floors can spread under flooring and into cabinets or the ceiling below. Dry it promptly. If it has soaked in, see appliance leak water damage.
Common causes
Supply line fitting
Loose compression nut.
Drain hose clamp
At the disposal or tailpiece.
Air gap overflow
Clog causes water at the sink.
Sink drain
Trap or tailpiece leak.
What to have ready when you call
- Property ZIP code, home or business
- Brand and model number (usually inside the door or on the back)
- Where water appears under the sink
What happens when you call RepairNowUSA
- Describe what is happening in plain words and give the property ZIP code. You do not need to know which trade to ask for.
- RepairNowUSA checks for a participating independent provider who handles plumbing repair in that area.
- If one is available, you are connected. The provider confirms timing, access, scope and price with you before any work.
- The provider, not RepairNowUSA, diagnoses and performs the repair.
RepairNowUSA is a referral and connection service. Provider availability and response times vary by location, time and demand, and are not guaranteed. Before you approve work, ask what was found, the price, the timing and what is not included.
Call 833-877-1717Dishwasher supply or drain connection leaking under the sink questions
Who fixes a dishwasher connection leak, a plumber or appliance technician?
Leaks at the supply, drain hose or sink plumbing are usually plumbing repairs.
Can I call at night or on a weekend?
Yes. You can call 833-877-1717 at any time, including nights, weekends and holidays. Whether an independent provider can come out right away depends on your ZIP code, the time and provider capacity, so availability is not guaranteed.
Authoritative references
These public sources give general safety context. They do not replace an on-site evaluation, and RepairNowUSA does not perform the work.