More than 20% of Nigerians do not have access to a toilet, a statistic that the president described as “disturbing”.
Mr Buhari has set up the Clean Nigeria Campaign Secretariat, which will ensure that “all public places including schools, hotels, fuel stations, places of worship, market places, hospitals and offices [will] have accessible toilets and latrines within their premises”.
The president follows in the footsteps of India Prime Minister Narendra Modi, who in 2014 pledged that he would end open defecation.
The number of toilets in India has increased significantly, but a BBC investigation found that many of them are not working or are not being used for various reasons, from lack of running water to poor maintenance to deeply ingrained cultural habits.
In Nigeria, an estimated 87,000 children die from diarrhoea every year, AFP reports citing World Bank data.