The sustainability of clean water and sanitation is significant issue among the related regulators. This issue has been the main concern for non-government organizations (NGOs) such as UNICEF, UNDP and others. The Centre of Strategic Studies, the National Board of Zakat, Republic of Indonesia (Puskas BAZNAS), has also conducted researches related to water and sanitation and published books, working papers, and other related materials as a concern on the issue.

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