I need a word for a restroom that does not have running water - where there is a pit toilet or a composting toilet instead of a flush toilet. If it were detached from a house, I am sure it would be called an outhouse. What is it called when it is in the house?
So the function of the room is the same as a restroom, it is the room where you would go to relieve oneself, but the facilities in the room are incongruous with the present definition of a restroom.
I am sure that people had such room prior to the invention of plumbing, but I cannot find any mention of it.
We have created such a room in our house for when the electric is out - which means we do not have water as we are on an electric well. But we are at a loss as to what to call it because it is definitely not a restroom.