I used this activity with high school students in a chemistry course at an alternative high school. It could easily be used with upper level elementary and middle school students.
Students complete a webquest based on the Monroe County Water Authority's website. It provides information regarding the water quality of drinking water in Upstate NY. A full answer key is provided for this activity.
Next, students complete a short lab over the course of 4 days recording their water use. Questions are provided to engage students in discussions about water conservation.