Hey,
Diploma in Sanitary Inspector is a full-time three-year Diploma course offered by the University of Calcutta, Kolkata. The eligibility criteria is to pass 12th from a recognized board.
For detailed information follow the link given below:
https://www.careers360.com/colleges/theni-college-of-arts-and-science-theni/diploma-in-sanitary-inspector-course
Hope this helps.
Good luck.