"I am going to write a letter to Prime Minister Narendra Modi soon in this regard," Pathak told reporters.
Pathak is the founder of Sulabh International, a social service organisation which works to promote human rights, environmental sanitation, non-conventional sources of energy, waste management and social reforms.
Pathak gave a cheque of Rs 1.5 lakh to a woman for construction of toilet at her home in Sadisopur village of Patna district.
"Building toilet at every household could herald an effective social change in the society," he said.
Pathak said more than a crore households particularly in rural areas were bereft of toilet due to which people have to practice open defecation.