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Major Aquifers

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The Texas Water Development Board (TWDB) has identified and characterized 9 major and 22 minor aquifers in the state based on the quantity of water supplied by each. A major aquifer is generally defined as supplying large quantities of water in large areas of the state. Minor aquifers typically supply large quantities of water in small areas or relatively small quantities in large areas. This dataset contains the 9 major aquifers in the state of Texas.

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