Here in Northern Virginia, I’ve seen a few vans for a company (can’t remember the name right now) that specializes in geese removal from the fountains of big office buildings. A quick Google search on geese removal brought up a company that does it in the continental United States. Perhaps they get rid of ducks, too.
Drake’s cakes for dessert! 
But seriously, folks… stop feeding them. Eventually they’ll take the hint. Of course, then they’ll probably all leave. But you could hang a bird feeder (or multiples thereof) and see what shows up.
Hey, monica! Now I know where you live. A little bird told me…
The Ducks
A film by Alfred Hitchquack
A tale of flapping flat-footed terror…