Worksheet: Water Purification

In this worksheet, we will practice describing methods of water purification and explore their advantages, limitations, and common applications.


Potable water must be sterilized before it can be drunk. Which of the following is not a common treatment agent in the production of potable water?

  • A Chlorine
  • B Ultraviolet light
  • C Ozone
  • D Calcium carbonate


Which of the following is not a source of fresh water?

  • A Rivers
  • B Rainwater
  • C Lakes
  • D Oceans
  • EAquifers


When preparing potable water from freshwater sources, the water is first passed through a coarse screen. What is the purpose of this screen?

  • ATo mix the water thoroughly
  • BTo catalyze the breakdown of contaminants
  • CTo help oxygen dissolve in the water
  • DTo removed large objects from the water
  • ETo neutralize acid in the water

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