Can anyone ID this pipe?
It looks to me like ribbed HDPE conduit used in directional boring.  Orange is the color that is traditionally used for telecom applications.  I'm guessing that this is either a fiber-optic back haul cable or an area trunk line, and the water that leaked out was due to a bad conduit seal somewhere.  Assuming that your phone is still working, I'd call either the "call before you dig" locator service that didn't flag it or local telecom utilities to see if it belongs to any of them.