Most small towns and many large cities, including Miami, Tucson, half of Houston, and parts of Cincinnati, use groundwater. Approximately 80 million people in the United States use groundwater supplied through individual wells and municipal groundwater systems. Approximately 2 million people in Canada are supplied by municipal groundwater systems. More than one billion people worldwide have no access to safe drinking water. Many residents of developing countries gather firewood to boil microbiologically contaminated water.
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