The Northern Territory Government will introduce a Darwin "water smart" program so it can delay spending on major infrastructure projects.

Resources Minister Willem Westra van Holthe told parliament that people in the greater Darwin region use about three times more water than those living in similar tropical locations, such as Townsville and Cairns.

He says this high usage will pose problems for Darwin River dam, given projected population growth.

The Minister says water consumption needs to be reduced.

He says if people conserve water, the Government can delay several expensive projects, such as increasing the capacity of Manton dam.

"People making simple reductions in water [consumption] could save the Northern Territory Government millions upon millions of dollars," he said.