What is a common sign of a plumbing leak?

A common sign of a plumbing leak is an increase in the water bill or the presence of water spots on ceilings. When there is a leak in the plumbing, water is escaping from its intended path, which can lead to a noticeable rise in water usage as reflected in the utility bill. Homeowners often first detect this through unexpected spikes in their water charges.

Additionally, water spots on ceilings are a direct indicator of moisture accumulation, which can result from plumbing leaks above. These stains indicate that water is infiltrating spaces where it shouldn't, pointing towards the presence of a leak that needs to be addressed.

Understanding these signs helps in early detection of plumbing issues, which can minimize damage and repair costs. The other answers may indicate various plumbing issues, but an increase in water bill or the formation of water spots are more definitive indicators of a leak specifically.