The report was released during an event jointly organised by the SASY, Safai Karamchari Andolan (SKA) and other organisations working towards the eradication of manual scavenging practice.
A sweeper and a security guard died on September 9 in Outer Delhi's Mundka area after they inhaled toxic gases inside a sewer.
Harsh Solanki, a sanitation worker from Gujarat, along with his family, also visited a Delhi government school and a hospital.
When the sweeper had gone down to clean the sewer, he fainted and the guard followed to rescue him and he also fell unconscious, the police said.
The multiple awareness programmes and crackdown measures have not stopped Tamil Nadu from getting the dubious distinction of being first in manhole deaths in the country.