A poorly defined groundwater divide in Hays County hydrologically separates the aquifer into the San Antonio and Austin regions. Texas State Historical Association. Latitude (DD) Longitude (DD) County. Water levels in the Trinity Aquifer, the county's main source of groundwater, plunged. The Maverick Aquifer, as it's been named, lies more than a mile deep under parts of Maverick, Uvalde, Dimmit and Kinney Counties. 6 character identifier derived from the aquifer name using the code derivation procedure also used for GWSI geohydrologic unit names. In general, groundwater is fresh but very hard in the outcrop of the aquifer. The aquifer maps and reports undergo continual revision to reflect the latest information available. Share sensitive information only on official, secure websites. Groundwater in the unconfined area is hard and typically has total dissolved solids concentrations less than 1,000 milligrams per liter. Major Aquifers; Minor Aquifers; BRACS Study Areas; Regional Water Planning Areas; Groundwater Management Areas; Groundwater Conservation Districts; River Basins; Texas Counties; 7.5' USGS Grid; 2.5' State Grid; Base Maps Purchase your copy of the brand new Texas Almanac today! Groundwater encountered within this area is normally under unconfined, water-table conditions and is most susceptible to contamination. Summary The Carrizo-Wilcox Aquifer is a major aquifer extending from the Louisiana border to the border of Mexico in a wide band adjacent to and northwest of the Gulf Coast Aquifer. Texas Water Development Board works best with JavaScript enabled. The U.S. Geological Survey prepared this dataset in cooperation with the Harris-Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, Lone Star Groundwater Conservation District, and Brazoria County Groun About 75 percent of this water is used for irrigation, with irrigators withdrawing most of this water from the Ogallala Aquifer alone (74 percent of all groundwater used for irrigation, or 4.5 million acre-feet per year). Below are publications associated with national aquifers. Several agencies are investigating playa recharge and agricultural re-use projects over the aquifer. The Trinity Aquifer consists of basal Cretaceous-age Trinity Group formations extending through 61 counties from the Red River in North Texas to the Hill Country of Central Texas. County State Well Number Aquifer Aquifer Type Entity/Cooperator Period of Record Wheeler : 0529711 : Ogallala : Unconfined : Texas Water Development Board 2006-07-18 to 2012-08-15: Carson . Water Tour | Aquifers Overview | Print Snapshot (PDF). 1700 North Congress Avenue, Austin, TX 78701TEL: 512-463-7847 / FAX: 512-475-2053, Asset Management Program for Small Systems, State Water Implementation Fund for Texas (SWIFT), Guidance & References for Online Loan Application, State Water Implementation Fund for Texas, 6th Planning Cycle Information (2026 RWPs), 2021 Regional Water Plans & Previous Plans, Regional Water Planning Data Entry Application (RWP22) Training, District Information (O-Z and Other Districts), Extended Naturalize Flow and Reservoir Evaporation, Flood Planning Useful Links and Resources, Drought Response and Financial Assistance, Water Conservation Plan ~ Utility Profile, Historical Water Loss Audit and Conservation Annual Report Data, Industrial, Commercial & Institutional (ICI), Brackish Resources Aquifer Characterization System, Notice of Nondiscrimination and Reasonable Accommodation, Texas Natural Resources Information System (TNRIS), Texas Water Infrastructure Coordination Committee (TWICC). Texas Water Development Board works best with JavaScript enabled. The Ogallala aquifer extends through 48 counties of the Texas Panhandle and is the southernmost extension of the largest aquifer (High Plains aquifer) in North America. This dataset documents the depth to groundwater measured in wells screened in the Chicot, Evangeline, and Jasper aquifers in the Houston-Galveston region, Texas for 2019. Aquifers covered by less permeable formations, such as clay, are confined under artesian pressure. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. The Ogallala Aquifer provides significantly more water for users than any other aquifer in the state. Edwards Aquifer Map Viewer. This list of national principal aquifer codes and names are fixed values assigned by the National Water Information System (NWIS). Water quality in the Carrizo-Wilcox Aquifer shows isolated areas of slightly saline to moderately saline groundwater in the eastern and central portions of the aquifer and more widespread areas of slightly to moderately saline groundwater in the southwest. A two-dimensional map representation of the principal aquifers of the Nation is shown below. This dataset, published in 2002, represents the extent of the alluvial and glacial aquifers north of the southern-most line of glaciation. Water levels in several counties in this region are very low due to over-pumping. Now called the Maverick Basin Aquifer, it is known to be at least 3,000 square miles in area and averages 1,000 feet thick in most places. the largest aquifer This map, which was derived fromGround Water Atlas of the United Statesdata (published as part of the National Atlas in 1998, revised 2003) indicates the areal extent of the uppermost principal aquifers on a national scale. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. 1700 North Congress Avenue, Austin, TX 78701TEL: 512-463-7847 / FAX: 512-475-2053, Asset Management Program for Small Systems, State Water Implementation Fund for Texas (SWIFT), Guidance & References for Online Loan Application, State Water Implementation Fund for Texas, 6th Planning Cycle Information (2026 RWPs), 2021 Regional Water Plans & Previous Plans, Regional Water Planning Data Entry Application (RWP22) Training, District Information (O-Z and Other Districts), Extended Naturalize Flow and Reservoir Evaporation, Flood Planning Useful Links and Resources, Drought Response and Financial Assistance, Water Conservation Plan ~ Utility Profile, Historical Water Loss Audit and Conservation Annual Report Data, Industrial, Commercial & Institutional (ICI), Brackish Resources Aquifer Characterization System, Notice of Nondiscrimination and Reasonable Accommodation, Texas Natural Resources Information System (TNRIS), Texas Water Infrastructure Coordination Committee (TWICC), Texas Aquifers Study: Groundwater Quantity, Quality, Flow, and Contributions to Surface Water, Reevaluation of desired future conditions for the Trinity Aquifer in Comanche and Erath counties, Reconnaissance Investigation of the Ground-Water Resources of the Brazos River Basin, Texas, Geology and Ground-Water Resources of Uvalde County, Texas, Ground-Water Geology of Bexar County, Texas, Ground-Water Resources of Guadalupe County, Texas, Changes in Groundwater Conditions in the Edwards and Trinity Aquifers, 1987-1997, for Portions of Bastrop, Bell, Burnet, Lee, Milam, Travis, and Williamson Counties, Texas, Ground-Water Resources of Bastrop County, Texas, Ground-Water Resources of Navarro County, Texas, Geology and Ground-Water Resources of Medina County, Texas, Geology and Ground-Water Resources of Hays County, Texas, Ground-Water Geology of Bandera County, Texas, Occurrence and Quality of Ground Water in Brown County, Texas, Occurrence and Quality of Ground Water in Montague County, Texas, Occurrence, Availability, and Chemical Quality of Ground Water in the Edwards Plateau Region of Texas, Ground-Water Evaluation in and Adjacent to Dripping Springs, Texas, Occurrence, Availability, and Quality of Ground Water in Travis County, Texas, Ground-Water Resources of Kerr County, Texas, Ground-Water Resources of Blanco County, Texas, Base-Flow Studies, Upper Guadalupe River Basin, Texas, Quality and Quantity, Ground-Water Availability of the Lower Cretaceous Formations in the Hill Country of South-Central Texas, Groundwater Availability of the Trinity Aquifer, Hill Country Area, Texas: Numerical Simulations through 2050, Occurrence, Quantity, and Quality of Ground Water in Taylor County, Texas, Ground-Water Quality Monitoring of the Trinity Aquifer in the Vicinity of Erath County, Occurrence, Availability and Chemical Quality of Ground Water in the Cretaceous Aquifers of North-Central Texas, Volumes 1 & 2, Ground-Water Resources of Part of Central Texas with Emphasis on the Antlers and Travis Peak Formations, Volumes 1 & 2, Evaluation of Water Resources in Part of Central Texas, The Paleozoic and Related Aquifers of Central Texas, Evaluation of Ground-Water Resources of the Paleozoic and Cretaceous Aquifers in the Hill Country of Central Texas, Updated Evaluation of Water Resources in Part of North-Central Texas, 1990-1999, Evaluation of Water Resources in Part of North-Central Texas, Occurrence and Quality of Ground Water in Jack County, Texas, Groundwater Availability Model: Hill Country Portion of the Trinity Aquifer of Texas, Desired future condition scenarios for the middle and lower Trinity Aquifer in Groundwater Management Area 10, Desired future condition scenarios for the Trinity Aquifer in Groundwater Management Area 10, Management plan information for Prairielands GCD, Management plan information for Central Texas GCD, Management plan information for North Texas GCD, Management plan information for Red River GCD, Management plan information for Post Oak Savannah GCD, Additional results from the analysis completed in GAM Task 10-005, Management plan information for Lost Pines GCD, Management plan information for Clearwater UWCD, Management plan information for Middle Trinity GCD, Management plan information for Hays Trinity GCD, Management plan information for Medina County GCD, Management plan information for Cow Creek GCD, Predictive simulations for the Edwards-Trinity (Plateau) and Trinity aquifers in Groundwater Management Area 9, Management plan information for Upper Trinity GCD, Management plan information for Neches & Trinity Valleys GCD, Additional results from the analysis completed in GAM Run 08-064, Predictive and steady-state simulations for the Trinity Aquifer in Groundwater Management Area 9, Management plan information for McLennan County GCD, Predictive simulation for the Woodbine and Trinity aquifers in Groundwater Management Area 8, Management plan information for Northern Trinity GCD, Management plan information for Fox Crossing Water District, Management plan information for Saratoga UWCD, Predictive simulation for the Trinity Aquifer in Groundwater Management Area 9, Predictive simulations for the Trinity Aquifer in Groundwater Management Area 8, Simulation to document locations and discharges to springs and rivers, and document the water budget in Groundwater Management Area 9, Predictive simulation for the Trinity Aquifer in Groundwater Management Area 8, Predictive simulation for the Trinity Aquifer in Lampasas County (Saratoga UWCD), Predictive simulation for the Trinity Aquifer in Mills County, Effects on Guadalupe River flow from various pumping scenarios in the Trinity Aquifer, Recharge information for the Carrizo-Wilcox, Edwards-Trinity (Plateau) and Trinity aquifers in Uvalde County, Recharge information for the Carrizo-Wilcox and Trinity aquifers in Medina County, Recharge rates for the Trinity Aquifer in Hays Trinity GCD, Analytical groundwater modeling to estimate water level drawdown in Erath and Comanche counties, Analytical groundwater modeling to assess water level drawdown by implementing hypothetical well fields, Decadal water level declines for the Upper and Middle Trinity aquifers of the Trinity (Hill Country) GAM, Recharge, leakage, and total storage for the Trinity (Hill Country) in Bandera County River Authority and GCD, Water budget, storage, and drawdown in 2050 for the Trinity (Hill Country) and Carrizo-Wilcox aquifers in Medina County GCD, Water budget by county for the Trinity (Hill Country) Aquifer, Estimated water levels at specified locations in the Trinity (Hill Country) GAM, Average well yield in Kendall County for the Trinity (Hill Country) Aquifer GAM, Managed available groundwater estimates for the Trinity Aquifer in Groundwater Management Area 8, Trinity Aquifer model runs for Central Texas GCD, County water budget for the Trinity (Hill Country) Aquifer GAM, Predictive simulations for the Trinity Aquifer in Clearwater UWCD, Modeled available groundwater for the Trinity Aquifer in Groundwater Management Area 10, Aquifer Test and Related Well Information from Public Water Supply Wells in Groundwater Management Area 8, Management plan data for Hill Country UWCD, Ground Water Recharge Model: Calibration and Validation for Remotely-Sensed Dual Coefficient (RDC) GMA8 ET Estimation, Management plan information for Blanco-Pedernales GCD, Management plan data for Blanco-Pedernales GCD, Management plan data for Neches & Trinity Valleys GCD, Management plan data for Middle Trinity GCD, GAM task - Total Estimated Recoverable Storage, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 6, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 7, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 9, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 10, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 13, Management plan information for Real-Edwards Conservation and Reclamation District, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 8, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 11, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 12, Management plan data for Southern Trinity GCD, Management plan information for Trinity-Glen Rose GCD, Management plan data for Trinity Glen Rose GCD, Management Plan data for Southern Trinity GCD, Management plan data for Hays Trinity GCD, Management plan data for Upper Trinity GCD, Management plan data for Northern Trinity GCD, Predictive simulations for the Trinity Aquifer in Groundwater Management Area 9, Management plan data for Medina County GCD, Management Plan data for Uvalde County UWCD, Management plan information for Middle Trinity GCD, Management plan data for Comal Trinity GCD, Management plan information for Headwaters GCD, Management plan information for Bandera County RA&GD, Management plan information for Hill Country UWCD, Management plan information for Neches and Trinity Valleys GCD, Management plan information for Southern Trinity GCD, Management plan information for Glen Rose GCD, Management plan information for Southwestern Travis County GCD, Management plan information for Bandera County RA & GD, Management plan information for Comal Trinity GCD, Proportion of aquifer with groundwater conservation districts: 88 percent, Number of counties containing the aquifer: 61. The availability of this water is critical to the economy of the region, as approximately 95 percent of groundwater pumped is used for irrigated agriculture. 1700 North Congress Avenue, Austin, TX 78701TEL: 512-463-7847 / FAX: 512-475-2053, Asset Management Program for Small Systems, State Water Implementation Fund for Texas (SWIFT), Guidance & References for Online Loan Application, State Water Implementation Fund for Texas, 6th Planning Cycle Information (2026 RWPs), 2021 Regional Water Plans & Previous Plans, Regional Water Planning Data Entry Application (RWP22) Training, District Information (O-Z and Other Districts), Extended Naturalize Flow and Reservoir Evaporation, Flood Planning Useful Links and Resources, Drought Response and Financial Assistance, Water Conservation Plan ~ Utility Profile, Historical Water Loss Audit and Conservation Annual Report Data, Industrial, Commercial & Institutional (ICI), Brackish Resources Aquifer Characterization System, Notice of Nondiscrimination and Reasonable Accommodation, Texas Natural Resources Information System (TNRIS), Texas Water Infrastructure Coordination Committee (TWICC), Texas Aquifers Study: Groundwater Quantity, Quality, Flow, and Contributions to Surface Water, Stratigraphic and Hydrogeologic Framework of Part of the Coastal Plain of Texas, Ground-Water Geology of Live Oak County, Texas, Ground-Water Resources of La Salle and McMullen Counties, Texas, Evaluation of Ground-Water Quality in Texas Counties Bordering the Rio Grande, Transmissivity, Hydraulic Conductivity, and Storativity of the Carrizo-Wilcox Aquifer in Texas, Ground-Water Resources of the Carrizo-Wilcox Aquifer in the Central Texas Region, Reconnaissance Investigation of the Ground-Water Resources of the Brazos River Basin, Texas, Ground-Water Resources of Grimes County, Texas, Ground-Water Resources of Brazos and Burleson Counties, Texas, Evaluation of Ground Water Resources in the Vicinity of the Cities of Henderson, Jacksonville, Kilgore, Lufkin, Nacogdoches, Rusk, and Tyler in East Texas, Geology and Ground-Water Resources of Uvalde County, Texas, Geology and Ground-Water Resources of Dimmit County, Texas, Ground-Water Geology of Bexar County, Texas, Ground-Water Geology of Wilson County, Texas, Ground-Water Resources of Guadalupe County, Texas, Ground-Water Resources of Caldwell County, Texas, Ground-Water Resources of Gonzales County, Texas, Availability and Quality of Ground Water in Leon County, Texas, Ground-Water Conditions in Anderson, Cherokee, Freestone, and Henderson Counties, Texas, Ground-Water Resources of Bastrop County, Texas, Ground-Water Resources of Lee County, Texas, Ground-Water Resources of Navarro County, Texas, A Digital Model of the Carrizo-Wilcox Aquifer Within the Colorado River Basin of Texas (cross-section figures, Availability and Quality of Ground Water in Smith County, Texas, Ground-Water Resources of Camp, Franklin, Morris, and Titus Counties, Texas, Ground-Water Resources of Houston County, Texas, Ground-Water Resources of Harrison County, Texas, Ground-Water Resources of Sabine and San Augustine Counties, Texas, Ground-Water Resources of Wood County, Texas, Ground-Water Resources of Gregg and Upshur Counties, Texas, Ground-Water Conditions in Angelina and Nacogdoches Counties, Texas, Ground-Water Resources of Rusk County, Texas, Geology and Ground-Water Resources of Medina County, Texas, Ground-Water Resources of Atascosa and Frio Counties, Texas, Ground-Water Resources of Rains and Van Zandt Counties, Texas, Availability and Quality of Ground Water in Fayette County, Texas, Depth to aquifer layers for the Carrizo-Wilcox, Queen City, and Sparta aquifers in McMullen County, Management plan information for Post Oak Savannah GCD, Predictive simulations for the Carrizo-Wilcox, Queen City, Sparta, and Yegua-Jackson aquifers in Groundwater Management Area 11, Management plan information for Wintergarden GCD, Analysis of pumping information for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 12, Management plan information for Uvalde County UWCD, Management plan information for Evergreen UWCD, Management plan information for Lost Pines GCD, Management plan information for Brazos Valley GCD, Management plan information for Live Oak UWCD, Predictive simulations for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 13, Management plan information for Medina County GCD, Management plan information for Neches & Trinity Valleys GCD, Management plan information for Rusk County GCD, Management plan information for Bluebonnet GCD, Predictive simulation for the Carrizo and Middle Wilcox aquifers in Anderson County, Management plan information for Mid-East Texas GCD, Management plan information for Panola County GCD, Management plan information for Pineywoods GCD, Predictive simulation for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 13, Average drawdowns by county for GAM Runs 08-41, 08-42, and 08-43 in Groundwater Management Area 13, Management plan information for Pecan Valley GCD, Management plan information for Fayette County GCD, Management plan information for McMullen GCD, Management plan information for Guadalupe GCD, Predictive simulation for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 11, Management plan information for Anderson County UWCD, Average drawdowns for the Carrizo-Wilcox, Queen City, and Sparta aquifers based on the analysis completed in GAM Run 06-029, Predictive simulation for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Fayette County GCD, Management plan information for Plum Creek Conservation District, Predictive simulation for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Mid-East Texas GCD, Predictive simulation for the Carrizo-Wilcox Aquifer in Rusk County GCD, Impacts of pumping increases in the in the Carrizo-Wilcox Aquifer near Jewett, Texas (Leon County), Recharge information for the Carrizo-Wilcox, Edwards-Trinity (Plateau) and Trinity aquifers in Uvalde County, Recharge information for the Carrizo-Wilcox and Trinity aquifers in Medina County, Water level information for the Gulf Coast, Carrizo-Wilcox, Queen City, and Sparta aquifers in Live Oak County, Water budget information for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Bee, Live Oak, and McMullen counties, Post Oak Savannah GCD, water budget, water levels, drawdown through 2050, 2002 State Water Plan pumping summary, and interaction with the Brazos River Alluvium Aquifer, Statistical summary and map of storage coefficient for the Simsboro Aquifer in Burleson County, Statistical summary and map of transmissivity of the Simsboro Aquifer in Burleson County, Recharge amounts and maximum pumping needed to maintain current water levels in Mid-East Texas GCD, Aquifer recharge values for Neches and Trinity Valleys GCD, Recharge amounts and maximum pumping that allows maintaining current water levels in Mid-East Texas GCD, Predictive run using Region C provided pumping, Predictive run using pumping data provided by Post Oak Savannah GCD, Water budget and total storage above 4000 depth in Evergreen UWCD, Total water availability in Henderson, Navarro, and Freestone counties, Recharge information and total storage above 3000 feet using a predictive simulation in Milam and Burleson counties, Recharge and total storage data for the Carrizo-Wilcox, Queen City, Sparta, and Gulf Coast aquifers in Fayette County GCD, Water budget, storage, and water level drawdown for the Carrizo-Wilcox Aquifer and recharge information for the Gulf Coast Aquifer in Bee GCD, Water availability for the Carrizo-Wilcox Aquifer in Henderson, Navarro, and Freestone counties, 20102030 water level drawdowns for the Carrizo-Wilcox Aquifer in Rusk, Smith, and Gregg counties, Water budget, storage, and drawdown in 2050 for the Trinity (Hill Country) and Carrizo-Wilcox aquifers in Medina County GCD, Recharge, available storage, estimated and projected declines for the Carrizo-Wilcox Aquifer in Pineywoods GCD, Estimated drawdown under assumed future pumping for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 13, Drawdown maps and water budget for GAM run 11-007, Predictive simulations for the Carrizo-Wilcox, Queen City, and Sparta aquifers in Groundwater Management Area 11, Management plan information for Gonzales County UWCD, Management plan data for Panola County GCD, Management plan data for Fayette County GCD, GAM run - Total Estimated Recoverable Storage, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 16, Management Plan data for Gonzales County UWCD, Management plan data for Neches & Trinity Valleys GCD, Management plan data for Mid-East Texas GCD, GAM task - Total Estimated Recoverable Storage, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 13, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 15, Management Plan data for Brazos Valley GCD, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 11, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 12, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 14, Predictive run using pumping distribution provided by Post Oak Savannah GCD, Management plan data for Medina County GCD, Management Plan data for Uvalde County UWCD, Management Plan data for Wintergarden GCD, Management plan information for Neches and Trinity Valleys GCD, Proportion of aquifer with groundwater conservation districts: 65 percent, Number of counties containing the aquifer: 66. 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