Nicole Hancock February 3, 2017 Science What is Safe Drinking Water Answer Key for Quiz for Students in Grades 9-12 To Accompany What Is Safe Drinking Water? Lesson Nicole Hancock February 3, 2017 Science 1. Name and describe the two major sources of drinking water. 1. Surface water: found on Earth's surface in lakes, rivers, dugouts and reservoirs 2. Groundwater: found in underground lakes called aquifers