The department is implementing a project at Dimapur town for pollution abatement of rivers Diphu and Dhansiri. The objective of the project is to reduce the pollution levels of the rivers caused due to discharge of raw sewage from households. The targeted intervention is to collect sewage from households through a system of sewers to a STP (Sewage Treatment Plant), thereby reducing the pollution level to an acceptable level.

The estimated cost of project was revised in 2013-14 out of which ₹ 82.8 crore has been approved. Physical progress is 71% as of date.