The fact that plumbing leaks take a specialized approach to locate is easy to understand when you consider the fact that the majority of your homes plumbing system exists either behind walls or under flooring. So when pipes spring pinhole leaks, or complete breaks, they are never visible to the naked eye. Special equipment and training in operating that equipment is necessary to find leaks at their source. This is why so many plumbers in Sunnyvale do not provide leak location service. They may advertise “leak detection” but this usually means breaking open flooring to expose the approximate location of a damaged line.