Think you know everything there is to know about water? You can't be sure until you Test Your WaterSense. Try EPA's new interactive online quiz! Move the water-efficiency hero Hydro through water pipes and answer water-efficiency questions while avoiding water-wasting monsters such as Sogosaurus and Drainiac. Use the information you've learned on the WaterSense Web site and test your knowledge of water-using behaviors and common water-saving opportunities.