The surficial aquifer in the Coastal Plain of these States should be included in the Northern Atlantic Coastal Plain aquifer system. A two-dimensional map representation of the principal aquifers of the Nation is shown below. (in error) Northern Great Plains aquifer system, Some revisions to the lists of valid States, this code, and reference list were added to the NWIS Site File and toNWISWebwith the release of NWIS 4.5 in 2005; see the WMA Technical Memo "NWIS 4.5 -- Assigning National Aquifer Codes in the Ground Water Site Inventory (GWSI) for the NWIS 4.5 Release.". Hydrogeologic unit boundaries (framework) and groundwater recharge data. Texas Water Development Board works best with JavaScript enabled. 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). Footer Social Media Navigation There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. This list of national principal aquifer codes and names are fixed values assigned by the National Water Information System(NWIS). Water quality is generally good northeast of the San Antonio River basin, but deteriorates to the southwest. Please note that the maps do not show the entire extent of an aquifer, only itssubcropor outcrop area. The Ogallala Aquifer is the largest aquifer in the United States and is a major aquifer of Texas underlying much of the High Plains region. In Texas, a minor aquifer is defined as one that supplies large quantities of water in small areas or small quantities of water in large areas. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. Aprincipal aquiferis defined as a regionally extensive aquifer or aquifer system that has the potential to be used as a source of potable (drinkable) water. The first 62 editions of the Texas Almanac are fully searchable to aid researchers and students of Texas history. Aquifers are identified by a geohydrologic unit code (a three-digit number related to the age of the formation, followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name). These declines are primarily attributed to municipal pumping, but they have slowed over the past decade as a result of increasing reliance on surface water. Below are publications associated with principal aquifers. 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. 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). A two-dimensionalmap representation of the principal aquiferswas derived from this data and published as part of the National Atlas in 1998 (revised 2003). 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. However, water quality diminishes to the south, where large areas contain total dissolved solids in excess of 1,000 milligrams per liter. Most water from aquifers is used for irrigation. The aquifer underlies an extensive area in south-central Texas extending along the Balcones fault zone from Kinney County eastward to San Antonio, and thence northeastward to Hays County. He got the county through the crisis, and thanks to some heavy rains in 2012, the aquifer rebounded a little. This document provides information on the basic functions of AWUDS and the steps f, Fresh ground-water withdrawals from 66 principal aquifers in the United States were estimated for irrigation, public-supply, and self-supplied industrial water uses for the year 2000. Nearly 80 percent of the groundwater produced in 2008 was used for irrigating crops, especially in the Panhandle region. Aquifers shown on the 2003PrincipalAquifers map, with some additions, were used as the first National AquiferReferenceList in the USGSNational Water Information System(NWIS) in theAggregate Water Use Data System(AWUDS,database released in August 2001). 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. Geology, Major and Minor Aquifers, BRACS Study Areas, Regional Water Planning Areas, Groundwater Management Areas, Groundwater Conservation Districts, River Basins, Counties, 7.5' United State Geological Survey Grid, 2.5' State Grid, Latitude, Longitude, and Land Elevation. Some of these declines have resulted in significant land-surface subsidence, particularly in the Houston-Galveston area. The largest area of groundwater-level decline in the Ogallala aquifer was found in Gaines County to the southwest of Denver City, Texas. 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