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In urban areas, most water is supplied from groundwater except for the cities of Karachi, and a part of Islamabad, where mainly surface water is used. In most rural areas, groundwater is used. In rural areas with saline groundwater, irrigation canals serve as the main source of domestic water.
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One way water is supplied to town residents is for the water department pump water from a reservoir, river, or well into a water tower, which often sits on high points in the town. Using gravity (free!), the water flows through pipes all the way to the last house in a subdivision.
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