I had a lawyer tell me at a NWF meeting that technically I could not cut down or treat the cattails in my private pond as my pond was considered a wetland or something to that effect. He said it didn't matter if it wasn't a wetland before I put in the pond. I told him I wasn't too worried about it and would do what I pleased in my pond.
It was a good group of people with only a few like this guy over the top.