13.1 (5 pts)
Where does your local drinking water come from? How might you identify its quality relative to clean water standards?
13.2 (10 pts)
How much does drinking water cost (in $/liter) is your locality from (a) the regular tap or (b) the nearest source of retail bottled water.
13.3 (10 pts)
Based on the typical local rainfall and water use in your area (e.g. city or metropolitan area), how much land is required as a watershed?