Yes there are many wild ducks around my lake and other birds including cranes, swans, pelicans, and etc. The few as in maybe 5 people I actually know of who are truely against them said that these ducks run a risk for disease, but so do the other birds. A long with claiming my property has attracted other houses of rat infestations because we feed the ducks outside. which isn't true. I guess there has been rat infestations in the neighborhood and people have set traps to poison them and the neighbors were claiming we did and it poisoned a raccoon so they don't want small children to be near our house because are ducks have diseases. I'm just trying to figure out how to handle a situation to prove that these ducks really won't and can't harm anybody.
You should find someone local to test your birds for disease and have him right a note with his signature that they are clean. Ducks arent as prone to disease as chickens and our fair never checks them for pullorum, only chickens.