Domestic ducks kept in small flocks and farmed ducks both require access to open water for health, cleanliness, and behavioral expression that constitutes a welfare essential.
Ducks denied bathing water develop predictable health problems from inability to clean their eyes and nostrils - structures anatomically designed for submersion in water. The welfare cost is direct and measurable through clinical signs. Water provision presents management challenges including litter moisture and bacterial load, but these challenges are solvable through appropriate drainage and regular cleaning. The welfare priority of water access for ducks is recognized in both companion animal and farm animal welfare guidance.