Understanding water quality
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## Contents

- Introduction
- Learning outcomes
- 1 Natural waters
- 2 Pollutants
  - 2.1 Natural organic material
  - 2.2 Living organisms
  - 2.3 Plant nutrients
  - 2.4 Organic and inorganic chemicals
  - 2.5 Heat
- 3 The extent of water pollution
  - 3.1 Surface water
  - 3.2 Groundwater
- 4 Treatment of water supplies
  - 4.1 Water treatment processes
- 5 Sewage treatment
  - 5.1 Sewage treatment processes
  - 5.2 Sludge disposal
- 6 What do you know about your water supply?
- Conclusion
- References
- Acknowledgements

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