Summary

In this Study Session, you have learned that:

• Protected water sources (often called ‘improved’ water sources) are those that have barriers against contaminants and provide water that is safe to drink.
• The drinking water ladder describes the steps in improvement of quality of water supply.
• Urban areas can obtain water supplies from groundwater, surface water and rainwater.
• Groundwater sources such as shallow wells, deep wells (boreholes) and springs should be protected against contamination by animals and surface run-off.
• Disinfection of the equipment at wells should be undertaken regularly.
• Surface waters are more prone to contamination than groundwater, and usually require treatment.
• Rainwater has several advantages as a water source.
• New water source development has to consider the capacity of the new source to supply water for a considerable time, and take into account factors such as raw water quality, seasonal variation, distance from consumers, cost, environmental impact and sustainability.