Pond seeping onto my yard?

[LindaP777]

What is the name of your state? OHIO
I own several rental properties on the same street. I was over there cutting the grass on Friday when I noticed the ground was very wet (standing in puddles in some places in the yard). I thought it was just from a lot of rain at first and then I began to investigate . . .

About the same time these houses were put in, another subdivision was put in right next to it. The developer put in a huge pond that separates these rental homes, from the larger more expense homes behind. A large retaining wall/hill divides the pond from my rental homes back yards.

As I climbed the retaining hill I noticed the hillside itself was saturated! It was slippery and wet the whole way up (about 15 feet higher than my backyards), so it couldn't be drainage off the roofs from the rain, as it's much higher. I believe the retaining wall/hill is seeping (altough I am not an engineer). I had a quick conversation with the mayor (just happened to know him) who called the city engineer. The city engineer says the pond is owned by the homeowners behind me, each parcel dissecting through the pond, so each homeowner bordering the pond owns shore, pond and the shore on the opposite side.

This seepage has potentially HUGE structural issues to my houses if not addressed.

QUESTION (you knew eventually I would get to it, didn't you?):
How (or who) can determine if the pond is seeping?
What is my next step?

[nextwife]

I would think that a report from an environmental engineer is where you'd start. Then the DNR, or municipal inspector/engineer. Or vice-versa.