Not every plumbing problem requires a plumber. Knowing the difference between a real problem and something you can handle on your own can empower you to make smart decisions about your plumbing. For example, most homeowners can plunge a toilet to remove a small blockage but most can't change their own fixtures. Some reasons to call for help can be: Clogged sewer lines Gas leaks Water heater installation Water leaks Water softener installation Water filtration installation