The population of Northwest Arkansas has grown significantly during the past 50 years. In 1960 there were fewer than 100,000 people living in Washington and Benton counties. Today, there are more than 400,000. Much of that growth has occurred within the boundaries of Fayetteville, Springdale, Rogers, and Bentonville. In 1973, the average demand for water from the four cities was about 15 million gallons per day (mgd). Today, demand is more than 42 mgd.

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