Water under the sink? Follow where it first appears.
A wet cabinet does not tell you which part failed. Water can follow the underside of a sink, travel along a hose, or drip from a joint before collecting in the lowest corner. Stop using the fixture if use makes the leak worse. From a dry, accessible position, note where fresh water first appears. That detail gives a plumbing provider a much better starting point than a guess about the part to replace.
Call about the leak877-702-1610Confirm the provider, address coverage, and charges before authorizing work.
If water is spreading toward an outlet, disposal wiring, or another electrical connection, keep clear. Do not reach through water to unplug equipment or operate a switch. A leak that cannot be contained safely needs prompt professional attention, not another test run.
The cabinet has two different water routes
The small supply connections bring water to the faucet. The larger drain assembly carries used water away. A supply-side leak may continue when the faucet is off. A drain leak may show up only after water has passed through the sink. Those patterns are useful, but neither is a diagnosis: a dishwasher can discharge into the same assembly, and water from a faucet body can run down into the cabinet.
Tell the provider whether the cabinet was wet before anyone used the sink, after a full basin drained, or after an appliance cycle. If the timing is unknown, say so. A remembered sequence is more valuable than recreating a leak that could damage the cabinet or the room below.
Clear a sightline without disturbing the plumbing
Move dry cleaning bottles and stored items only when the space is safe to reach. Keep children and pets away from wet cleaners or sharp objects. You can photograph the visible connections without touching them. A wide picture shows how the faucet, drain, disposal, and appliance hoses relate; a second picture can show the damp area.
Do not tighten a fitting simply because it looks like the source. Supporting one part while turning another can matter, and older or corroded pieces may break when disturbed. Do not remove the trap, disconnect a hose, apply sealant over an unidentified leak, or run a disposal with your hand inside the cabinet. The purpose of your observation is to preserve a useful view, not to take the assembly apart.
A shutoff that will not move is a separate problem
A clearly identified fixture shutoff may limit a supply leak if it can be reached safely and operates normally. Stop if it is stuck, crumbling, already leaking, or difficult to identify. Forcing a valve can turn a small drip into a larger release. Tell the provider whether a valve was left untouched, closed successfully, or began leaking when approached.
Do not assume closing the faucet stops water at every connection below it. Also avoid operating a shared building valve without authorization. In a rental or managed building, use the maintenance contact and explain whether other apartments or shared spaces could be affected. If building water must be stopped, the person controlling that system needs to coordinate the interruption.
Ask what the repair actually includes
A useful proposal names the failed component and the evidence supporting that conclusion. It should distinguish a connector replacement from a faucet replacement, a drain-joint repair, or work on piping inside the wall. Ask whether removal of a disposal, dishwasher connection, countertop fixture, or cabinet panel is part of the price. An inaccessible connection can change the work even when the replacement part is small.
For Portland residential work, ordinary fixture maintenance and pipe replacement are not interchangeable permit categories. The provider should resolve the appropriate permit or exception for the actual scope. You can review the City's residential plumbing permit guidance, then ask who will arrange any required inspection. This website cannot decide that question from a photograph.
Keep the cabinet repair separate from the pipe repair
Stopping fresh water does not establish that a swollen shelf, damp wall, or wet floor has dried. Ask the plumbing provider what moisture or material damage was visible and which work is outside the plumbing scope. If another specialist is needed, get that boundary in writing. Do not cover stained or damaged material just to make the cabinet look finished before the condition has been assessed.
Save the original photographs and the repair description. If the wet area returns, knowing which component was changed prevents a second visit from starting with an incomplete history. The same record can help you distinguish old discoloration from a genuinely new leak without declaring a hidden space dry yourself.
Check the conditions that produced the drip
Before the visit ends, ask how the repaired connection was checked. A supply connection and a drain assembly are not tested in exactly the same way. Tell the provider about any dishwasher or disposal use associated with the original leak so the relevant condition is not missed. Let the provider perform the appropriate checks; do not repeatedly fill a sink after a leak has been identified.
To discuss water under a sink, call 877-702-1610. Ask who is answering, whether the provider handles your address, and what any visit or diagnostic charge covers. Portland Leak Notes is an independent information and referral website, not the contractor performing the repair.