Leak
It is simply... You need to look for a mainline shut off near or around you main line going into your house. there should be some kind of backflow installed, at the backflow there should be a manual shut off handle. If there is no backflow then look for a quarter turn ball valve or gate valve on the mainline going into the house. If you still cant locate a shut off then go to the street and shut it off at the city main/meter for your house. Once the water is off dig up the valve box, determine the valve manufacture and model then call you "Horizon distriubutors" to locate the parts need to correct the problem. You can also go to Horizononline.com to locate locations closest to you, or call 520.876.5697 I can help. Thank and have a great day