Installing a water hydrant is easy if there is already an existing water supply at that location. If a water supply is not available then you need to get one out to where the yard water hydrant needs to be. The connection end of most yard hydrants is 3/4 inch so count on running the line in 3/4” or 1” and then reducing down if need be that way you get plenty of water. For this project I chose a location for my yard water hydrant near some in ground sprinkler valves. I knew there would be water there and I could cut a tee into the PVC for the water source. Finding water in the area where you want the yard water hydrant is a good idea because it can save a lot of digging or trenching.