Drinking water comes from resevoirs, resevoir water flows in from rivers and groundwater.
Water is filtered at water treatment plants. Chemicals are added to remove bacteria and the water is then filtered again.
To monitor quality the water companies take samples of water and test them.
Water dissolves most ionic compounds. Water molecules surround the ions, attracting them more than they attract each other, so the solid structure falls apart.
In agriculature water is needed for irrigation
In industry water is used as a raw material, as a solvent, and for cooling. For example power stations use huge quatities of water for cooling.
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