The Public Health Engineering Department (PHED) of Nagaland is responsible for providing safe and potable drinking water, managing the safe disposal of solid and liquid waste, and promoting environmental hygiene. Key initiatives include rural and urban water supply projects, Swachh Bharat Mission (Grameen), and the Jal Jeevan Mission, which aims to ensure functional tap connections in households. The department also focuses on water quality monitoring, surveillance, and community participation in maintaining water supply infrastructure.