Thanks to everyone for your thoughts on this. I wish I could believe it was just decaying organic matter, but it has been doing this since it started to fill. I would think the debris would not have started to decay yet! As far as limestone deposits, there is a lot of limestone in this county. The creeks have slabs of it exposed, and we found one large limestone boulder in a recently cleared area of our tillable land. Is limestone causing the bubbling? Does that equate to a leak in the future?
