VEG Alexandria in Virginia is a 24-hour emergency hospital for pets of all kinds, including birds and exotics. Its site says the team handles emergency care for avians, reptiles and other exotic pets. The page does not mention ducks or waterfowl.
Lucks Lane Veterinary Clinic in Richmond treats dogs, cats and exotic pets, and its species page lists ducks and chickens among the birds it sees. The clinic also accepts parrots, peacocks and other avian patients alongside reptiles, small mammals and amphibians.