He also underlined that construction of toilets in habitations on the banks of River Ganga should receive the highest priority.
During a meeting here to review the progress of the 'Swachh Bharat Mission', the Prime Minister was also briefed on the progress towards toilet construction in all the states.
After comprehensively reviewing the situation, he directed officers concerned to specially coordinate with states which are lagging in toilet construction, a PMO statement said.
He said motivational incentives such as awards should also be instituted through official channels.
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In rural areas, Modi suggested organising quiz competitions among students to promote awareness.
The Prime Minister called for leveraging the "huge interest" that 'Swachh Bharat' has generated among the Indian diaspora, the statement said.
Urban Development Minister Venkaiah Naidu and Rural Development Minister Chaudhary Birender Singh were also present at the meeting.