ABSTRACT
Behind the eco-friendly mosques in Indonesia are progressive Muslim figures who employ Islamic jurisprudence (fiqh) in various ways to support Green Islam. One key debate surrounds recycled greywater, which has not been allowed for ablution. This article questions the extent to which mosques have accepted the use of recycled water and how to change public perception regarding its use for ablution. It takes Istiqlal Mosque in Indonesia as a case study. By conducting literature reviews, observations, and fiqh analysis, this article finds that negative public perception, rather than Islamic jurisprudence, is the main obstacle to reusing recycled ablution water. The article recommends that mosques obtain a MUI Halal Certification for recycled ablution water and address misinformation. These strategies may enhance the religious sector's contribution to sustainability, specifically Clean Water and Sanitation (SDG 6) and Climate Action (SDG 13).
