Sanitary workers are not like other workers of any occupation but they are also one of the most vulnerable communities among scheduled castes in India. Scavenging or sanitary work is still prevalent as a customarily caste based occupation in India. As per 2011 census the population of Hadi community in Odisha was 2.5 lakh who are largely engaged in sanitary work. They are also called by different local names such as Mehenter, Behera, sweeper and scavengers.
Source