The first known covered sewers are from the bronze age Indus Valley Civilization (3300-1300 BCE). Cities were carefully planned, and homes had indoor bathrooms, sometimes even on the second floor. Even the poor had sanitation facilities. Water was conducted to brick lined cesspools and then discharged into the river.
It was thousands of years before covered sewer systems became widespread around the world. In the nineteenth century, with the Industrial Revolution and discoveries about how disease was spread, cities in the U.S. and Europe began to build sewers. Today, only 31% of the world’s population lives in houses connected to a sewer.
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