Rod,

My pond when full was indeed higher than the neighboring pond. About 2 feet higher, just because of the grade of the land. His pond is going down as well, but at maybe half the rate of mine. His is down 3-4” compared to my 7”.

I wasn’t sure if the fact that his is 4x the size of mine if that’s why his was going down slower. Or if your speculation is correct and mine is slowly leaking into his.

If that seems to be the consensus on here, what should I do next? Will my new ground self compact over time and fix the issue? Should I get a couple of buckets of DamIt and spread along the shared dam?

I just worry that if they equalize and if in the dead of summer his is down a foot, mine would be down 2 feet based on the grade.