Corrected entry: In "Office Olympics", Dwight says the only bathroom on his farm is under the porch. Later, in "Money", Mose is shown using an outhouse.
Correction: Dwight might have not considered the outhouse a "real" bathroom because it only has a toilet and no plumbing.
Correction: That doesn't make sense that he wouldn't consider an outhouse with a toilet, walls and a door a bathroom but he would consider crouching down under his porch to squat over dirt, a bathroom...I think the initial correction is true.