The WaterSense program is a voluntary partnership program sponsored by the Environmental Protection Agency (EPA) that is designed to encourage water efficiency in the U.S. through the use of a special label on consumer products. In order to carry the WaterSense label, a toilet must use 1.28 gallons or less per flush and remove at least 350 grams of waste as measured by third-party MaP testing. The purpose of WaterSense labeling is to make it easy for consumers to identify products that save water yet do not require a lifestyle change. Delta toilets are WaterSense labeled.

WaterSense is a registered trademark of the U.S. Environmental Protection Agency.