Over the past week, you notice the water from the river that your family usually utilizes for domestic purposes having a different color and smell. Your first thought is the water may be contaminated and there was a clean bottle around. Being the biologist, you are, you collected a sample of the water and took it to the laboratory for testing. During that time, you are wondering where can the possible contamination come from.

Using the scenario above, answer the following questions.

1. What are some possible sources of the contamination?
2. State five water quality parameters you will test for and why? 
3. What will the results of the water quality parameters tell us about the health of the river? 
4. List and explain three man-made sources of freshwater pollution.  
5. Explain how the pollutants released from the sources listed in 4 will affect aquatic ecosystems. 
6. Suggest three mechanisms the authorities can use to prevent this from reoccurring