Located on the western tip of the Himalayas, Tajikistan has abundant fresh water resources in its rivers, lakes,and glaciers. Yet, access to improved drinking water, and to sanitation connected to a functioning sewerage system, are among the most severe and unequally distributed services in the country. Unsafe water supply, sanitation and hygiene (WASH) conditions have significant adverse effects on well-being, particularly for rural residents, the poor and the children. Glass Half Full: Poverty Diagnostic of Water Supply, Sanitation, and Hygiene Conditions in Tajikistan documents the realities, characteristics, and priorities of Tajikistan’s WASH-deprived population. It presents new, comprehensive evidence on the coverage and quality of WASH service conditions, along with their diverse well-being impacts. It also identifies institutional gaps and service delivery models that can inform future policies and investments in the WASH sector. The findings communicate a sense of urgency that should inspire the government, civil society, and the international community to accelerate their actions toward addressing WASH deprivation in Tajikistan.