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Carrizo-Wilcox Aquifer (pdf) The Wilcox Group and the overlying Carrizo Formation of the Claiborne Group form a hydrologically connected system known as the Carrizo-Wilcox aquifer. This aquifer extends from the Rio Grande in South Texas northeastward into Arkansas and Louisiana, providing water to all or parts of 60 counties. |
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Cenozoic Pecos Alluvium Aquifer (pdf) Located in the upper part of the Pecos River Valley of West Texas, this aquifer provides water to parts of Andrews, Crane, Ector, Loving, Pecos, Reeves, Upton, Ward, and Winkler counties. The aquifer provides water for irrigation, industrial, power generation, and public supply uses elsewhere. |
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Edwards Aquifer (pdf) The Edwards (Balcones Fault Zone, or BFZ) aquifer covers approximately 4,350 square miles in parts of 11 counties. The aquifer forms a narrow belt extending from a ground-water divide in Kinney County through the San Antonio area northeastward to the Leon River in Bell County. |
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Edwards-Trinity (Plateau) Aquifer (pdf) The Edwards-Trinity (Plateau) aquifer underlies the Edwards Plateau east of the Pecos River and the Stockton Plateau west of the Pecos River, providing water to all or parts of 38 counties. The aquifer extends from the Hill Country of Central Texas to the Trans-Pecos region of West Texas. |
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Gulf Coast Aquifer (pdf) The Gulf Coast aquifer forms a wide belt along the Gulf of Mexico from Florida to Mexico. In Texas, the aquifer provides water to all or parts of 54 counties and extends from the Rio Grande northeastward to the Louisiana-Texas border. Municipal and irrigation uses account for 90 percent of the total pumpage from the aquifer. |
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Hueco-Mesilla Bolson Aquifer (pdf) The Hueco and Mesilla Bolson aquifers are located in El Paso and Hudspeth counties in the far western tip of Texas. The aquifers are composed of Tertiary and Quaternary basin-fill (bolson) deposits that extend northward into New Mexico and westward into Mexico. |
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Ogallala Aquifer (pdf) The Ogallala aquifer, the major water-bearing unit in the High Plains of Texas, provides water to all or parts of 46 counties. Water-bearing areas of the Ogallala are laterally connected except where the Canadian River has eroded through the formation, thereby forming the boundary between two separate flow systems referred to as the Northern and Southern High Plains. |
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Seymour Aquifer (pdf) The Seymour Formation consists of isolated areas of alluvium found in parts of 23 north-central and Panhandle counties. Approximately 90 percent of the water pumped from the aquifer is used for irrigation. Municipal pumpage,primarily for the communities of Vernon, Burkburnett, and Electra, accounts for eight percent. |
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Trinity Aquifer (pdf) The Trinity aquifer consists of early Cretaceous age formations of the Trinity Group where they occur in a band extending through the central part of the state in all or parts of 55 counties, from the Red River in North Texas to the Hill Country of South-Central Texas. |
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Major Aquifers of Texas (pdf) |
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Minor Aquifers of Texas (pdf) |
Other Water Related Maps
