As a homeowner, you need to know where the main shut off valve of your home’s water supply is, and make sure that it is in excellent condition. Check that you can easily turn on/off your shut off valve, which is usually located near your home’s water meter. Now, turn the valve off, go around your house, and turn on every faucet. If any faucet has a flow, or even just drips, the entire plumbing system may have to be checked and repaired.