Water resources play a crucial role in both the ecology and daily life of Dharmanagar.
* **Juri River:** The city is situated along the banks of the Juri River. The river is a vital source of water for irrigation and has historical significance in the settlement of the region. * **Dighis:** Large man-made lakes, historically dug by local royalty or wealthy merchants, act as water reservoirs and recreational areas. Prominent among them are the Rajbari Dighi and the Khola Dighi.