ET Lawn Watering Program

How Much Water Does Your Lawn Need?

With ET—short for EvapoTranspiration—United Water’s lawn-watering program, you can maintain healthy yards without wasting water.

All you have to do is check the daily ET number, from May to September, when the program is in effect. Then you will know exactly the amount of water that your lawn needs on that day.

We partner with local weather experts who help determine when your lawn needs watering. They measure water loss from soil through evaporation and moisture loss from plants through transpiration, and determine a daily ET number. That’s the optimal amount of water your lawn truly needs on any given day.

Your lawn stays green and healthy, and you can save up to $200 a year by reducing your outdoor water use.