During the excavation at Chahun Jo Daro,Dist. Benazirabad. According to David French Archaeologist working on the site, the structure of drainage system has been discovered. The earliest evidence of urban sanitation was seen in Harappa, Mohen jo Daro and recently discovered from Chahun Jo Daro by Pakistani and French archaeological mission 2020. The urban areas of indus valley provided public and private baths, sewage was disposed through underground drains.