Upper class kitchens, servants only, eventually got water pumps, sinks, drains, and occasionally water on tap. Sinks were less common, and you started to see them much more after piped water was used. In this image you can see a pipe of some kind attached to the back of the wall, right over heat appliances, such as a gas stove.
Victorian Cooking and Kitchens
Understanding the Victorian Kitchen
I researched this to help me get a better understanding of, The Land, by Mildred D. Taylor, when I start to read it.