Kennewick Irrigation District customers are being asked to follow a schedule that gives each residential user 30 minutes per zone twice a week to water lawns.

Irrigation officials are hoping customers follow the voluntary guidelines to avoid the mandatory watering schedules that were required in the 2015 drought, the Tri-City Herald reported.

The voluntary water rationing comes as the water supply for KID drops to 67 percent of what it is entitled to use if water is available from the Yakima River Basin.

If weather patterns do not improve, conditions will worsen, KID officials said.

While the watering schedule is not mandatory, KID says conserving water now will provide more water to use later.

KID is making arrangements with nonresidential water users for conservation measures. They include farms, school districts, and cities with many parks and golf courses.

The voluntary schedule is for houses on less than two acres.