What is a common sign of a plumbing leak?

Water stains on ceilings or walls serve as a clear indicator of a plumbing leak because they often develop when water from a leak permeates through materials and surfaces. When there is a persistent leak, the moisture can create discoloration, bubbling, or peeling of paint and drywall, making it visually obvious that there is an issue. This staining typically originates from sources such as a leaking pipe, especially if it's located above the ceiling or behind a wall. Notably, identifying water stains can prompt further investigation to locate the source of the leak and address the issue promptly to prevent further damage.

While internal mold growth, strange noises from appliances, and an increased water bill can all be symptomatic of plumbing problems, they are not as immediate or direct indicators as water stains. Mold growth typically occurs as a result of prolonged moisture, strange noises can vary widely in source and are not specific to leaks, and an increased water bill might only indicate a problem if compared over time rather than being an instant visual clue like water stains.