Picture the cavity beneath your sink or behind your shower wall. It’s cramped and dark, and if the plumbing has sprung a leak, then it’s wet too—precisely the sort of environment where many types of pests thrive. Obviously, pest control and prevention aren't the only reasons to repair faulty pipes and connections, but they're a reason to do so sooner rather than later. After all, you wouldn't leave out food for an extended period of time because it might lead to an infestation. By the same token, you shouldn't let plumbing problems persist—those pests need water as much as they need food.