The past couple winters I noticed the water level dropped about 4 inches over the 7 months it's been closed for the winter (I use a solid cover, btw). I'm not sure if the water level stopped at the leak location of if would have continued to leak if I left the pool covered/closed longer.

During the summer I don't notice any unusual water loss.

Since I'm only losing about 1/2 inch per month, is it even worth persuing finding and repairing the leak at this point? Or should I take a wait and see approach and address it if it gets worse?