1. Contaminants in Water

2. Water is a Solvent Some substances in water are good!

3. Contaminants contaminant: an undesirable substance in a mixture
Where do they come from?

4. Types of Contaminants Chemical Biological Fertilizers Herbicides
Pesticides
Salt
Minerals
Acid Rain
Other chemicals
Biological
Micro-organisms
Organic Matter

5. Contaminants in Fresh Water
Contaminants in Water.doc

6. Walkerton Crisis

7. Acid Rain Video

8. Endangering Animals

9. Check Your Learning
1. Name two parts of the water cycle in which contaminants can be introduced.
2. (a) What are the two main categories of contaminants in water?
(b) Why are they a problem?
3. Choose two chemical contaminants that could be found in a freshwater source. For each one,
(a) identify a source of the contaminant
(b) describe how the contaminant got into the water
4. Briefly describe how a biological contaminant was able to get into groundwater wells at Walkerton.