Ja, with a submersed pump, most likely the pipe got chafed from torque movement. Just hope the leak isn't underground. A friend had a new rock well put in and later was having the same problem you describe. He had noticed that his old mud well was overflowing constantly and thought nothing of it. Turns out when they put in the new well, they just cut into the existing pipe and elbowed off from it. The elbow wore through and the water taking the path of least resistance ran down the pipe to the old well, filling it to overflowing.
At about the same time, his neighbor had his electric meter replaced and was commenting that his electric bills were now much smaller. Meanwhile, my friend's bills were going through the roof from the pump running constantly but he thought they wired the neighbor's meter wrong and it was diverting to his meter. He fought with the electrical utility for months before discovering the leak in the pipe.
Too funny!