Silly - I'm blonde, but if the head was sticking up out of the ground, don't you think I would have at least tripped over it during the last dozen years?
well I would have thought so..I guess it could be away from the house but that does not really make sense. If you know where the main pipe comes in you might be able to get someione to trace the line out for you..(well witcher) some laugh I'm sure but I've seen it work..also the line should be about 3 feet underground and lots of times the ground will settle around that line so the ground is indented and you can follow it that way..
Sounds like you may have a not very deep well..Mine was deep, 748 feet, cost me $12k to dig it, but like you I never used mione to water the grass and was really careful with it..My STBXMIL sank one one time because she wanted to keep her place pretty during a drought.. she is a DASTBXMIL by the way..just sayin