What a fixture check can show
Running a faucet can reveal basic function, available water flow or a visible leak. An appraiser may also observe under a sink or note a concern with a water heater when relevant to the work.
These observations have limits. A brief check does not establish the condition of concealed pipes, diagnose a defect or test every component of the plumbing system.
Instructions differ by assignment
A lender or loan program may have specific property-observation requirements. A private appraisal for an estate, a divorce or another agreed purpose may have a different scope. Ask what the appraiser will need to observe and whether utilities must be available.
Tell the appraiser in advance if water is shut off, a fixture cannot be used or access is unsafe. That information can affect arrangements and the way the report addresses what could be observed.
When a specialist is needed
If you need to know why water pressure is low, whether a leak has damaged hidden materials or what repairs will cost, consult an appropriate inspector or plumbing professional. The appraisal considers value; it does not replace that investigation.
Share existing inspection findings and repair records with the appraiser. Visible deficiencies and completed repairs are useful property information.