The following questions should be addressed and answered within the lesson: Where does our drinking water supply come from? (Groundwater or Surface Water) Why is it important to treat drinking water? What impurities or contaminants may be found in our drinking water? What are the effects of poor water quality on human health? How can our water be made safe to drink? What is the difference between rural and urban drinking water? What is the difference between Canadian drinking water guidelines and the regulations for Drinking Water in Europe and USA?