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Water stains on ceilings or walls serve as important indicators of potential leaks in a plumbing system. When water leaks from pipes, it can seep through ceilings and walls, leaving behind visible discolorations and stains. These stains often appear brownish or yellowish and can vary in size depending on the severity and duration of the leak. Observing these stains can prompt a homeowner or inspector to investigate further, identifying the source of the leak and addressing it promptly to prevent further damage, such as mold growth or structural issues.

The other options may not directly indicate active leaks. Dry patches on walls could be due to several factors, including previous water damage that has since dried up, not necessarily a sign of current leaks. Rust on plumbing fixtures may suggest corrosion or age but does not automatically imply that there is a leak currently occurring. Increased water pressure in pipes can be a result of various plumbing conditions but often doesn’t correlate with visible signs of leaks. Identifying water stains as a telltale sign allows for timely interventions in plumbing maintenance and repairs.