In the event of an emergency water leak, you need to call a professional right away. Many people try to address leaks on their own, but if you wait too long to deal with a roof leak or leaking faucet, you could find yourself with a disastrous flood on your hands! Many plumbing emergencies happen quite suddenly, leaving you with little time to react, but the best thing to do in the moment is to try to shut off the local water supply while calling for help as quickly as possible.