Plumbing discussions and local services.
Discussion options
When should a kitchen sink leak prompt the main shutoff?
A closed fixture shutoff doesn’t always stop water from a leak beneath the kitchen sink. If water keeps coming, the next step depends on whether it’s actually a pressurized supply line or a drain, and where the leak sits relative to the valve.
I’d be wary of treating tape or a clamp as a dependable fix, especially if the line is still under pressure or the pipe material and damage aren’t clear. What signs would make you shut off the home’s main supply rather than try temporary containment, and when is it safer to call for urgent plumbing help?
Join the conversation
Share your experience or ask a follow-up question.
1 reply
If water continues after the fixture valve is closed and a supply leak is possible, I’d shut off the main if it’s safely accessible and you can’t confidently identify or control the source. That won’t stop a drain leak, so don’t rely on a patch as a dependable fix. Call for urgent plumbing help if the flow won’t stop, is spreading, or is reaching electrical equipment; don’t put yourself at risk trying to reach a valve or contain it.
Find a local plumber.
Loading local plumbers…