How obvious is the leak? Can you find it and just splice a new section in? I had a line that was installed back in the 1970's some kind of black plastic. I was able to repair a couple of leaks, but the last one could not be found, no water on the surface. So, I had to replace the whole line. All 400 feet. The water company's response was, "it's on your side of the meter, it your responsibility." In one day, a friend and I trenched a new line, I used PVC due to cost. No permit, just get in and get out. I'm on a dead end road which help with keeping a low profile.