Water is leaking under the sink. What should I do first?

What you can do

If water keeps leaking, close the correct accessible isolation valve without forcing it.
Only in safe surroundings, collect spilled water and place a container under the drip. Do not run the tap to recreate the leak.
Photograph the visible connection and say whether it leaked while the sink was unused.

Closing the valve limits damage; it does not repair the faulty part. Resume use after repair and a leak check.

Stay away from wet electrical equipment. Isolate power only from a dry, safe position. Tell the building manager if shared services are involved.

Once the leak is controlled, NAPREMO can assess seals, alignment and damaged parts. Do not patch siphon joints with silicone.

Technical references