What are the causes of water scarcity in available areas? -Geography

What are the causes of water scarcity in available areas? -Geography
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This scarcity may be due to bad quality of water. Lately, there has been a growing concern that even if there is ample water to meet the needs of the people, much of it may be polluted by domestic and industrial wastes, chemicals, pesticides and fertilisers used in agriculture, thus, making it hazardous for human use.
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