If you need to turn off your water main, the process is relatively simple. Depending on the age of your home and what type of plumbing system it has, there may be a couple of different ways to go about shutting off the water supply. The most common way is to locate the main valve near where your house's water line connects to the city or private line that supplies it with fresh drinking water. This valve should usually have an easily identifiable handle or knob allowing you to quickly shut off all incoming water from outside sources. If this isn't present, some homes may also have a secondary shutoff inside located near either their hot-water heater or backflow preventer; if neither of these are present then you'll likely need to contact a plumber for help in finding and shutting down your main supply valve. Once this has been done successfully, before turning any valves back on make sure that all pipes leading into and out of your house are properly insulated so as not to freeze in colder climates!