The aquifer is used for municipal, industrial, and irrigation purposes. You may need to request the addition of Alluvial aquifers to the list of aquifers valid in your State. 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). Secure .gov websites use HTTPS Water Use. Extensive development of the Trinity Aquifer in the Dallas-Fort Worth and Waco areas has resulted in water-level declines of 350 to more than 1,000 feet. . The Edwards (BFZ) aquifer forms a narrow belt extending through 13 counties from a groundwater divide in Kinney County through the San Antonio area northeastward to the Leon River in Bell County. The published maps contain base and cultural features not included in these data. Water Quality Available. It is part of the U.S. Geological Survey National Water Information System. The aquifer is comprised of the Twin Mountains, Glen Rose, Paluxy, Hosston, and Hensell formations. The pages below contain descriptionsand maps of these main aquifer types: These pages, formerly hosted at ourAquifer Basicswebsite,provide ageneral summary of information published in the Ground Water Atlas of the United States. U.S. Geological Survey 505 Ferguson Lane Austin, Texas 78754-4501 The Edwards and Trinity aquifers are classified as major aquifers by the Texas Water Development Board and are major sources of water in south-central Texas, where Hays County is located. The aquifer is primarily composed of sand locally interbedded with gravel, silt, clay, and lignite. The desired future conditions provide the foundation for estimating the amount of groundwater available to the region. The information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. And so we've seen water levels drop in those aquifers and we've seen spring flows as a response also drop. In 2019, more than 90 percent of the water pumped from the Ogallala was used for irrigation, while more than 90 percent of the Hueco-Mesilla pumpage served municipal purposes. This aquifer underlies the Edwards Plateau, extending through 40 counties from the Hill Country of Central Texas westward to the Trans-Pecos region. Water-level declines in excess of 200 feet have occurred in Reeves and Pecos counties but have slowed since the mid-1970s with the decrease in irrigation pumpage. Water level increases were found in the northern portion of the study area, near the Yoakum and Terry County boundary and in northeastern Gaines County. Spaces in crystalline rocks are microscopically small, few, and generally unconnected. 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. Click any position on the map to reveal attributes for a specific location. Water is generally hard and contains dissolved-solids concentrations ranging from less than 300 to more than 5,000 parts per million. Freshwater saturated thickness averages 95 feet. These aquifers consist of limestones, sands, clays, gravels, and conglomerates. Groundwater also supplies about 35 percent of the municipal needs of the state. Secure .gov websites use HTTPS 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). Nearly 80 percent of the groundwater produced in 2008 was used for irrigating crops, especially in the Panhandle region. Water from the Antlers portion is used mainly for irrigation in the outcrop area of North and Central Texas. Please note that the maps do not show the entire extent of an aquifer, only itssubcropor outcrop area. 6 character identifier derived from the aquifer name using the code derivation procedure also used for GWSI geohydrologic unit names. In 2008, irrigation accounted for 43 percent of water pumped from the aquifer, and municipal supply accounted for 47 percent. (February 2005), Valley and Ridge carbonate-rock aquifers were removed:these now should be included in Valley and Ridge aquifers. About 55 percent of all water used in Texas was sourced through aquifers in 2019. The EAA has an active program to educate the public on water conservation and also operates several active groundwater recharge sites. The San Antonio River Authority also has a number of flood-control structures that effectively recharge the aquifer. Throughout most of its extent in Texas, the aquifer yields fresh to slightly saline water that is used mainly for irrigation in the Winter Garden District of South Texas, and for public supply and industrial use in Central and Northeast Texas. 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. Select the area, distance or location tool below. General Information Letters and Private Letter Rulings, State Tax Automated Research (STAR) System, Historically Underutilized Business (HUB), Vendor Performance Tracking System (VPTS), Texas Procurement and Contract Management Guide, Minnie Stevens Piper Foundation College Compendium. For the area tool click points on the map to begin building the polygon you want to measure and then double click to close the polygon. It consists of sandstone and limestone formations of the Trinity formations, and limestones and dolomites of the Edwards and associated limestone formations. Aquifers are vital to the states economy and environment, highlighting the need for their proper management and conservation. However, some individual aquifers serve mostly municipal purposes. 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 Click any position on the map to reveal attributes for a specific location. This aquifer consists of isolated areas of alluvium found in parts of 25 north-central and Panhandle counties in the upper Red River and Brazos River basins. Surficial deposits of glacial origin (New Jersey) should be included in Sand and gravel aquifers (glaciated regions). Each PA was sampled across its lateral extent using an equal-area grid, typically with 60 wells. Increased salinity may be associated with evaporative concentration of groundwater in saline playa lakes in the southern portion of the aquifer, up flow of more saline groundwater from the underlying Dockum Aquifer and other sources./p>. The map layer was developed as part of the effort to produce the maps published at 1:2,500,000 in the printed series Ground Water Atlas of the United States. Texas State Historical Association. (March 2005). 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). For an overview ofprincipalaquifers:The principal water-yielding aquifers of North America can be grouped into five types by rock type and location: unconsolidated and semiconsolidated sand and gravel aquifers, sandstone aquifers, carbonate-rock aquifers, aquifers in interbedded sandstone and carbonate rocks, and aquifers in igneous and metamorphic rocks. The water-yielding properties of carbonate rocks vary widely; some yield almost no water and are considered to be confining units, whereas others are among the most productive aquifers known. Texas State Historical Association (TSHA). A lock () or https:// means youve safely connected to the .gov website. Declines continue in Ward County due to increased municipal and industrial pumping. The Gulf Coast aquifer forms an irregularly shaped belt that parallels the Texas coastline and extends through 54 counties from the Rio Grande northeastward to the Louisiana border. The recharge zone of the aquifer in Burnet County is approximately 18,011 acres. Center the map where you want the center of your print, enter a title in the textbox and choose a page size for your print using the drop down. . The Geologic Atlas of Texas illustrates the surface extent of geologic formations (and aquifers) across the state. Located in the upper Pecos River Valley of West Texas, this aquifer, formerly called the Cenozoic Pecos Alluvium, extends through 12 counties. New and Environmentally Improved. Groundwater encountered within this area is normally under unconfined, water-table conditions and is most susceptible to contamination. However, water quality diminishes to the south, where large areas contain total dissolved solids in excess of 1,000 milligrams per liter. Years of heavy pumpage have caused significant water-level declines in portions of the aquifer. In 2008, municipal uses accounted for 62 percent and irrigation accounted for 25 percent of the total pumpage from the aquifer. Page Contact Information: Texas Water Data Maintainer Page Last Modified: 2023-02-25 01:14:50 EST The component aquifers are Lower Tertiary, Upper Cretaceous, Lower Cretaceous, and Paleozoic. This list of national principal aquifer codes and names are fixed values assigned by the National Water Information System (NWIS). About 32 percent of water used to meet municipal demands is from groundwater. These aquifers, which are in rocks that range in age from Pleistocene to Cambrian, Irrigation pumpage accounted for 94 percent of the total use from the aquifer in 2008. A national layer, including all available SSA coverages, is available for use in GIS. Irrigation accounts for more than half of the aquifer's discharge. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. It is absent in a broad area extending from the north central portion of the county continuing to the south, southwest part of Gillespie County. The appropriate component aquifer should be used instead of Northern Great Plains. Proceeds benefit education in TX. (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.". The Ogallala Formation of late Miocene to early Pliocene age consists of heterogeneous sequen-ces of coarse-grained sand and gravel in the lower part, grading upward into clay, silt, and fine sand. 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