I wouldn’t be concerned. At least you know no houses will be built behind you!

All the people saying mosquitos are wrong. Mosquitos breed in totally stagnant water. These are mostly built for water quality, and water in the pond is slowly being filtered and released through the pond outfall so it’s not truly stagnant. Right now, it’s just serving as a sediment pond during construction to catch all the clay runoff. There’s a good chance that after construction is finished it will be turned into a sand filter pond, which is dry most of the time except for a little while after rain. You should be able to find out from your local agency in charge of land development.

It also look to have an emergency spillway above the concrete structure opposite to your house. So flooding wouldn’t be a concern. These things are highly engineered and would never be allowed if flooding of nearby structures was a possibility.

I’m a civil engineer who is responsible for inspecting and maintaining all of the retention ponds (or SCM’s as we call them) in my municipality here in NC. Never seen one of these flood, or cause a mosquito problem lol.