I would be careful about getting a pet duck if they aren't allowed. You won't be able to hide it for very long... The noise will set your neighboors off.
A couple of years ago, a neighboor of mine got himself a rooster. I was the one who called the city myself to complain because the thing was squaking every friggin' morning and wouldn't stop. I live in downtown Montreal so I was pretty peeved at being woken up at 5am by the damned rooster. I treasure my sleep and can ignore many sounds but a loud rooster just won't do!
You won't be able to prevent your duck from quacking and since they tend to do this very early in the morning, I would guess that it won't be long before someone complains about the racket...
I love all animals, but I won't tolerate a neighboor's animal making too much noise and regularly...
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!