An assessment was done of the sustainability of interventions completed in the Philippines under the International H20 Collaboration between Rotary International and the United States Agency for International Development. The Philippines is one of three pilot countries where this Alliance was operationalized with the goal of implementing sustainable water, sanitation, and hygiene (WASH) projects. There were five different grants which supported a wide range of WASH projects, including some aimed more specifically at environmental health (i.e. pollution reduction). This report documents the findings from a Sustainability Check applied projects including: Manila - Santa Ana wastewater treatment system and solid waste management for market and surrounding BarangaysSan Fernando; La Union - Septage management and wastewater treatment system; Zamboanga - Urbanised reticulated water supply and hygiene promotion; Davao - rural reticulated water supply and hygiene promotion; and Dipolog - rural reticulated water supply and hygiene promotion.