Ducks are considered farm animals and those are often not allowed in suburbs...
I had some pet ducks when growing up and they can be fun, when they aren't nipping at you that is! lol We kept our in a outdoor pen for most of the time and brought them into the garage when it was really cold.
One thing that can be quite annoying, especially if you're not expecting this is that they get up quite early and are very noisy when hungry! It was a daily thing at our house when we had those ducks, just like roosters, they would awake at the crack of dawn (5-5:30am) and quack until someone ran out to feed them. The buggers can be pretty loud too!
Keeper of 5 snakes, leopard geckos, 1 green iguana, 20+ tarantulas, 2 dogs & a bunch of rats!