Most farmers were either small landholders or tenant farmers, and they had no indoor plumbing.
I know about this first hand. My grandfather was born and grew up on a small farm near Moberly, Missouri. he was a tenant farmer until the market dropped out for what he was growing (corn and barley) and he became a freight agent for the Railway Express in McCook, NE. Later he started a livery stable in Kansas City and ended up working for Standard Oil (now Amoco) as a service station operator. With his father, he built his own house in Kansas City, completing it in 1922.