It encourages non-metered water customers to volunteer for meters.
The department's commissioner says, a year and a half into the program, 96 percent of people with new meters are on track to save money.
"We want people to have meters because that will prompt them to be more aware of the water that they use, and that's important in our efforts to save an important natural resource," said Thomas Powers, commissioner of water management.
Homeowners taking part will be eligible for a seven-year guarantee that their water bills will be no higher than if a meter was not installed.
