I need some assistance please. I was mowing a yard today when I noticed water streaming out of the ground. At first I thought I must have run over a sprinkler head and chopped it off with the mower but upon closer inspection I saw that the water was coming up and out of a round valve cover box. Keep in mind that outside of replacing a sprinkler head or programming a timer I have never done anything with irrigation systems. I removed the round cover but couldn't see into the valve box because the water filling the box was all muddy and brown. I reached in and could feel what felt like water coming out of a break in the PVC pipe at the bottom of the valve cover box. I called an acquaintance that does irrigation installs to find out how to shut off the water. He told me to go out by the street where the water meter is located and there should be a rectangular box with a handle to turn to shut the water to the system off. If I couldn't find that I should look for a back flow valve with two handles, which would also shut the water off. Near the water meter I found one round valve box with a spigot handle in it which I turned and that shut the water off to the broken pipe. After much searching I could not find any back flow valve either above ground near the house or below ground in a square valve box. I know it is the law to install these backflow valves. Now when the property owner gets home she calls me because she has no water. This leads me to my questions. 1. The only thing I can figure about the broken pipe is I ran over the valve cover box and it got pushed down into the PVC pipe, which caused it to break, is this possible or likely? Should the valve box be able to get pushed into the pipe and broken? 2. I am beginning to suspect that the installer did not put in the backflow valve. Is there a way I can find out for sure? 3. Should the water shut off for the irrigation also shut off the water to the house? Right now the only way the water to the house works is if I turn the irrigation water back on. 3. This system was installed less then a year ago and is still under warranty. Would you think that this broken pipe would be covered? I am meeting with the installer in the morning and I am beginning to think that he may have done a shoddy install job but I just don't know enough about irrigation systems to know for sure. If it is my fault for the water leak I'll get it fixed but if it is due to poor installation I want him to fix it. Any help you guys can give me will be appreciated.