PCWS is a non-governmental organization in the Philippines that was established in 1990 to improve water supply, sanitation, and hygiene in poor communities. It engages in projects at both the village and national levels by providing technical solutions, capacity building, advocacy, and environmental protection. At the village level, PCWS introduces low-cost water and sanitation technologies, builds community capacity, promotes wastewater treatment, and increases community participation in decision making regarding water resources and the environment.