One of the most costly types of plumbing issues to deal with is a hidden leak. Many homeowners have small leaks in their pipes and are not aware of them because the pipes are buried deep in their walls, foundation or ground soil outside the home. These leaks may go unnoticed for months or even years in some cases, and they can result in the incredible expense of wasted water. A plumber can help you to accurately diagnosis the presence of a hidden water leak. However, before you call a plumbing company for assistance, you may consider observing your home for some of these tell-tale signs of a leak.