What is a common indicator of a leak in a plumbing system?

A common indicator of a leak in a plumbing system is both unusual noise from the pipes and an increased water bill. When there is a plumbing leak, it can lead to a variety of sounds, such as dripping, hissing, or gurgling, which indicate that water is escaping from its intended path. This audible sign can alert homeowners to potential issues within the plumbing system.

Additionally, a leak often results in a noticeable increase in the water bill. As water continuously leaks from pipes, fixtures, or appliances, homeowners will be charged for the excess water usage, even if it is not being used for any intentional purposes. Therefore, both these factors are critical in identifying potential leaks, making option C the most comprehensive and accurate choice.

Recognizing these signs early can help homeowners address plumbing issues promptly, potentially preventing more extensive damage and costly repairs down the line.