"These discoveries establish the existence in Sind (the northernmost province of the Bombay Presidency) and the Punjab, during the fourth and third millennium B.C., of a highly developed city life; and the presence, in many of the houses, of wells and bathrooms as well as an elaborate drainage-system, betoken a social condition of the citizens at least equal to that found in Sumer, and superior to that prevailing in contemporary Babylonia and Egypt. . . . Even at Ur the houses are by no means equal in point of construction to those of Mohenjo-daro."
January 1, 1970
https://en.wikiquote.org/wiki/Sanitation_of_the_Indus_Valley_Civilisation