Delineations of the downdip boundaries of such aquifers as the Edwards (BFZ), Trinity, and Carrizo-Wilcox are based on chemical quality criteria. The Geologic Atlas of Texas illustrates the surface extent of geologic formations (and aquifers) across the state. It consists of the Hooper, Simsboro, and Calvert Bluff formations of the Wilcox Group and the overlying Carrizo Formation of the Claiborne Group. In Harris, Galveston, Fort Bend, Jasper, and Wharton counties, water level declines of as much as 350 feet have led to land subsidence. 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. Aquifers can contain fresh, brackish, or saline water; or, usually, all three There are several types of aquifers with very different characteristics Michael Conner: Understanding Aquifers 7 All the "science" about aquifers is a simplification, and it is frequently quite controversial. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. A lock () or https:// means youve safely connected to the .gov website. Texas Water Development Board works best with JavaScript enabled. This dataset, published in 2002, represents the extent of the alluvial and glacial aquifers north of the southern-most line of glaciation. Alluvial aquifers--consist of stream-valley aquifers and other aquifers of unconsolidated alluvial materials, not included in another named national aquifer, south of the limit ofQuarternarycontinental glaciation and east of the Rocky Mountains. Page Contact Information: Texas Water Data Maintainer Page Last Modified: 2023-02-25 01:14:50 EST Until recently, San Antonio was one of the largest cities in the world that relied solely on a single groundwater source for its municipal supply. Historically, Texas has had a wealth of fresh to slightly saline water, which underlies more than 81 percent of the state. The aquifer is comprised of the Twin Mountains, Glen Rose, Paluxy, Hosston, and Hensell formations. The Texas Water Development Board recognizes and names 15 such aquifers. Water levels in the Trinity Aquifer, the county's main source of groundwater, plunged. Edwards (Balcones Fault Zone) (San Antonio-oriented) 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. The first publication of the core of the national aquifer list in a comprehensive manner was theGround Water Atlas of the United States(USGS Hydrologic Atlas 730, published in 2000) published as part of the National Atlas in 1998, revised 2003. The surficial aquifer in the Coastal Plain of these States should be included in the Northern Atlantic Coastal Plain aquifer system. Computer models of the northern and southern portions of the Ogallala aquifer were completed by the Texas Water Development Board and its contractor. Results of the Regional A, 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands), map representation of the principal aquifers, Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, Circular 1279,Estimated Withdrawals from Principal Aquifers in the United States, 2000, Groundwater, Aquifers, Wells, and Springs, Users Manual for the National Water Information System of the U.S. Geological Survey: Aggregate Water-Use Data System, Version 3.2, Estimated withdrawals from principal aquifers in the United States, 2000, Principal aquifers [of the United States], Arkansas, Colorado, Delaware, Kansas, Kentucky, Louisiana, Maryland, Missouri, Montana, Nebraska, New Jersey, North Dakota, Ohio, Oklahoma, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia, Wyoming, Arizona, California, Idaho, Nevada, New Mexico, Oregon, Utah, Illinois, Iowa, Michigan, Minnesota, Missouri, Wisconsin, Alabama, Florida, Louisiana, Mississippi, Texas, Arizona, Colorado, New Mexico, Utah, Wyoming, Connecticut, Maryland, Massachusetts, New Jersey, New York, North Carolina, Pennsylvania, Virginia, Alabama, Florida, Georgia, South Carolina, Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, Wyoming, Iowa, Kansas, Minnesota, Montana, Nebraska, North Dakota, South Dakota, Wyoming, Montana, North Dakota, South Dakota, Wyoming, Alabama, Arkansas, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee, Texas, Mississippi River Valley alluvial aquifer, Arkansas, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee, Alabama, Illinois, Indiana, Iowa, Kentucky, Maryland, Missouri, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, New York and New England crystalline-rock aquifers, Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont, New York and New England carbonate-rock aquifers, Connecticut, Maine, Massachusetts, New Jersey, New York, Pennsylvania, Vermont, North Coast Limestone aquifer system (Puerto Rico), Northern Atlantic Coastal Plain aquifer system, Delaware, District of Columbia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Virginia, Northern Rocky Mountains Intermontane Basins aquifer systems, Arkansas, Illinois, Kansas, Missouri, Oklahoma, California, Idaho, Nevada, Oregon, Utah, Washington, Wyoming, California, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming, Minnesota, Montana, North Dakota, South Dakota, Wyoming, Alabama, Georgia, Illinois, Indiana, Kentucky, Maryland, Michigan, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, Piedmont and Blue Ridge carbonate-rock aquifers, Maryland, New Jersey, North Carolina, Pennsylvania, Piedmont and Blue Ridge crystalline-rock aquifers, Alabama, Delaware, District of Columbia, Georgia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, South Carolina, Tennessee, Virginia, West Virginia, Sand and gravel aquifers (glaciated regions), Connecticut, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Massachusetts, Michigan, Minnesota, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New York, North Dakota, Ohio, Pennsylvania, Rhode Island, South Dakota, Vermont, Wisconsin, Illinois, Indiana, Iowa, Kentucky, Michigan, Missouri, Ohio, Tennessee, Wisconsin, Southeastern Coastal Plain aquifer system, Alabama, Georgia, Mississippi, South Carolina, Tennessee, Alabama, Florida, Georgia, North Carolina, South Carolina, Alabama, Georgia, Maryland, New Jersey, New York, North Carolina, Pennsylvania, Tennessee, Virginia, West Virginia, First publication of the core of the national aquifer list in a comprehensive manner was the, Aquifers shown on the 2003 Principal Aquifers map, with some additions, were used as the first National Aquifer reference list in NWIS, released in AWUDS v. 1.0 for the national compilation of water-use data for the year 2000 (database released in August 2001). 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. 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 In 2019, more than 4.4 million acre-feet were pumped from the Ogallala Aquifer, accounting for 67 percent of the water sourced from all major Texas aquifers. (February 2005), Valley and Ridge carbonate-rock aquifers were removed:these now should be included in Valley and Ridge aquifers. Water quality is generally good northeast of the San Antonio River basin, but deteriorates to the southwest. The study area comprises about 2,000 square miles of out-crops of the Chicot and Evangeline aquifers in northwest Harris County, Montgomery County, and southern Walker County. Note that alluvial aquifers north of the limit of continental glaciation are included inSand and gravel aquifers (glaciated regions). The aquifer now provides approximately 90 percent of the citys drinking water. 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. Revisions to the reference list since it was first used by NWIS: Northern Great Plains aquifer system was removed:this umbrella term includes four national aquifers but is not considered a national aquifer itself. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. 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. Some of these declines have resulted in significant land-surface subsidence, particularly in the Houston-Galveston area. 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. You may need to request the addition of Alluvial aquifers to the list of aquifers valid in your State. 1, Water table decline maps for the Ogallala Aquifer in South Plains UWCD, Water budget and total available storage for the Ogallala Aquifer in Garza County UFWCD, Water budget and total available storage for the Ogallala Aquifer in Mesa UWCD, Terry county water budget for the Ogallala Aquifer, Predictive simulations for the Ogallala and Edwards-Trinity (High Plains) aquifers in Groundwater Management Area 2, Management plan data for North Plains GCD, Groundwater Recharge in the Central High Plains of Texas: Roberts and Hemphill Counties, Revised management plan data for North Plains GCD, Management plan data for Garza County UWCD, GAM task - Total Estimated Recoverable Storage, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 1, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 2, Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 3, 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 by county for aquifers in High Plains UWCD No. Some water-bearing formations dip below the surface and are covered by other 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. For Geophysical Well Log assistance contact. Secure .gov websites use HTTPS 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). The recharge zone of the aquifer in Burnet County is approximately 18,011 acres. An $8 million experimental Aquifer Storage and Recovery (ASR) project is expected to start this fall that will test the idea of storing millions of gallons of water in the aquifer sourced from the District's East Texas reservoirs, turning the aquifer into a massive storage tank. Texas State Historical Association. Water from the Antlers portion is used mainly for irrigation in the outcrop area of North and Central Texas. Results of the Regional A, 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands), Unconsolidated and semiconsolidated sand and gravel aquifers, Regional Groundwater Availability Studies, North and South Carolina Atlantic Coastal Plain, Pennsylvanian and Mississippian Aquifers of the Appalachian Plateaus, Groundwater, Aquifers, Wells, and Springs, Minor aquifers, confining units, and areas identified as "not a principal aquifer", Quality of groundwater used for public supply in the continental United States: A comprehensive assessment, Principal aquifers [of the United States]. Declines continue in Ward County due to increased municipal and industrial pumping. 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. Sandstone aquifers can be highly productive and provide large volumes of water. The Texas Water Development Board (TWDB) has identified and characterized nine major and 20 minor aquifers in the state based on the quantity of water supplied by each. This dataset, published in 2003, contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. 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 information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. For Geophysical Well Log assistance contact. Throughout much of the aquifer, groundwater withdrawals exceed the amount of recharge, and water levels have declined fairly consistently through time. 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>. They are grouped into four categories: basin-fill, blanket sand and gravel, glacial-deposit, and stream-valley aquifers. San Antonio Although the Carrizo-Wilcox Aquifer reaches 3,000 feet in thickness, the freshwater saturated thickness of the sands averages 670 feet. The information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. The aquifer consists of sand, gravel, clay, and silt and has a maximum thickness of 800 feet. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. Groundwater in the confined area of the aquifer is generally softer and has total dissolved solids concentrations less than 1,000 milligrams per liter except in the southern and western portions of the aquifer. Aquifers in carbonate rocks are most extensive in the eastern U.S. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. National aquifers, or principal aquifers of the United States, are defined as regionally extensive aquifers or aquifer systems that have the potential to be used as a source of potable(drinkable)water. In 2005,thenational aquiferinformationwas addedto NWIS, allowing users to search by national aquifer code and name from the reference list below. The aquifer maps and reports undergo continual revision to reflect the latest information available. 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. Aquifers are shown in the States of Maine, Vermont, New Hampshire, Connecticut, Massachusetts, Rhode Island, New Jersey, New York, Pennsylvania, Ohio, Indiana, Michigan, Wisconsin, Illinois, Minnesota, Iowa, Missouri, Kansas, Nebraska, South Dakota, North Dakota, and Montana. In 2008, irrigation accounted for 43 percent of water pumped from the aquifer, and municipal supply accounted for 47 percent. Although water level declines in excess of 300 feet have occurred in several areas over the last 50 to 60 years, the rate of decline has slowed, and water levels have risen in a few areas. The groundwater information summarized in the Atlas was collected over many years by the USGS and other partner agencies,andprovides key descriptive information in a regional and national context. Whether you are a teacher or home-school parent, you will find our Teacher's Guide to be an invaluable tool for teaching all things Texas to your students. The Ordovician age Ellenburger aquifer is a fractured limestone and dolomite and is present in the southeastern and northwestern portions of the county. User Guide - This downloadable PDF document explains how to use the tools available in the viewer. In 2008, almost 96 percent of the water pumped from the Ogallala was used for irrigation. The Hickory aquifer occurs in parts of 19 counties in the Llano Uplift region of Central Texas. Water-use data collected using this list of aquifers will be published in. These data delineate the areal extent of the alluvial and glacial aquifers as defined in The Ground Water Atlas of The United States. 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. 1, Management plan data for Llano Estacado UWCD, Management Plan Information for Hemphill County UWCD, Management plan information for Mesquite GCD, Management plan information for High Plains UWCD #1, Management plan information for Hemphil County UWCD, Proportion of aquifer with groundwater conservation districts: 86 percent, Number of counties containing the aquifer: 49. Municipal use accounted for 63 percent of the total aquifer use in 2008. January 31, 2023. Select the area, distance or location tool below. 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. A lock () or https:// means youve safely connected to the .gov website. National Geographic Information Systems (GIS) layer of SSAs Information on sole source aquifers (SSAs) is widely used in assessments under the National Environmental Policy Act and at the state and local level. Guadalupe runs dry with rainfall scarce. Surficial deposits which are not of glacial origin may be coded as Alluvial aquifers. The Texas Water Development Board (TWDB) specifically disclaims any and all liability for any claims or damages that may result from providing these data. Texas Water Development Board works best with JavaScript enabled. Five GCD's (Red on the map), the GMA12, are required to work together to set these conditions for the Carrizo-Wilcox Aquifer. Freshwater saturated thickness averages 95 feet. A .gov website belongs to an official government organization in the United States. Irrigation used the largest amount of ground water, 56,900 million gallons per day, foll, PrefaceThe Ground Water Atlas of the United States presents a comprehensive summary of the Nation's ground-water resources and is a basic reference for the location, geography, geology, and hydrologic characteristics of the major aquifers in the Nation. 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 In Texas, the Panhandle is the most extensive region irrigated with groundwater. (March 2005). A poorly defined groundwater divide in Hays County hydrologically separates the aquifer into the San Antonio and Austin regions. The aquifer is comprised of the Twin Mountains, Glen Rose, Paluxy, Hosston, and Hensell formations. Tell us about it! This system has been divided into three major water-producing components referred to as the Chicot, Evangeline, and Jasper aquifers. Water is generally hard and contains dissolved-solids concentrations ranging from less than 300 to more than 5,000 parts per million. 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. It consists of the Hooper, Simsboro, and Calvert Bluff formations of the Wilcox Group and the overlying Carrizo Formation of the Claiborne Group. 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. Additional aquifer data through the USGS web app Irrigation pumping accounts for slightly more than half the water pumped, and pumping for municipal supply accounts for another 40 percent. Larry French, director of the groundwater division at the Texas Water Development Board, spoke to Texas Standard about its potential . Well, in Central Texas, and particularly the Edwards Aquifer, it's an aquifer that has a lot of caves in it and fractures. Aquifers covered by less permeable formations, such as clay, are confined under artesian pressure. 500--Sandstone and carbonate-rock aquifers. Elevation (ft) Well Depth (ft) Water Level Observation Type. storage and recovery facility 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. 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). The Maverick Aquifer, as it's been named, lies more than a mile deep under parts of Maverick, Uvalde, Dimmit and Kinney Counties. For the location tool click on the map to get coordinates for a particular location. Groundwater movement is generally toward the southeast. Irrigation accounts for more than half of the aquifer's discharge. Latitude (DD) Longitude (DD) County. 400--Carbonate-rock aquifers. the largest aquifer Dell City irrigation from the Bone SpringVictorio Peak minor aquifer in Hudspeth County. The characterization of the state's groundwater resources and the development of the maps depicting these aquifers have been accomplished by many staff members of the TWDB over many years. The appropriate component aquifer should be used instead of Northern Great Plains. Several agencies are investigating playa recharge and agricultural re-use projects over the aquifer. Search and browse the first 148 years of the Texas Almanac, hosted on the UNT Portal to Texas History. About 32 percent of water used to meet municipal demands is from groundwater. In 1993, the Edwards Aquifer Authority (EAA) was created by the legislature to regulate aquifer pumpage to benefit all users from Uvalde County through a portion of Hays County. 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. Irrigation was the principal use in Medina and Uvalde counties. Purchase your copy of the brand new Texas Almanac today! Below are publications associated with principal aquifers. 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. Additionalhydrogeologicand groundwater recharge data is available through theRegional Groundwater Availability Studiesof theNational Water Census. (Note that the National Aquifer Code uses a different numeric component than the geohydrologic unit names.). This is an important step in planning for water in Texas and Bastrop County for the next 50 years. It is part of the U.S. Geological Survey National Water Information System. Does your community have an annual fair or festival you'd like to have listed on our site, or in the next Texas Almanac? In 2008, 72 percent of groundwater pumped from the aquifer was used for irrigation, and the rest is withdrawn for industrial uses, power supply, and municipal use. A major aquifer is generally defined as supplying large quantities of water in large areas of the state. Get your free copy of the 20202021 Texas Almanac eBook. Hydrogeologic unit boundaries (framework) and groundwater recharge data. Excessive pumping has lowered the water level, particularly in the artesian portion of the Winter Garden District of Atascosa, Dimmit, Frio, LaSalle, and Zavala counties and in the municipal and industrial areas of Angelina, Nacogdoches, and Smith counties. Entriesinitalicsare no longer valid.To learn more about a specific aquifer, visit the Principal Aquifers websitefor an overview, or access more extensive information from theGround Water Atlas of the United States. These aquifers, which are in rocks that range in age from Pleistocene to Cambrian, In most places where these two rock types are interbedded, the carbonate rocks yield much more water than the sandstone. In the south, the Trinity includes the Glen Rose and underlying Travis Peak formations. It is the third most important groundwater resource in Texas after the Edwards and the Ogallala aquifers. For the location tool click on the map to get coordinates for a particular location. However, water quality diminishes to the south, where large areas contain total dissolved solids in excess of 1,000 milligrams per liter. The published maps contain base and cultural features not included in these data. 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 He got the county through the crisis, and thanks to some heavy rains in 2012, the aquifer rebounded a little. In cooperation with Harris-Galveston Subsidence District, the City of Houston, Fort Bend County Subsidence District, Lone Star Groundwater Conservation District, and Brazoria County Groundwater Conservation District, the U.S. Geological Survey Texas Water Science Center Gulf Coast . Click any position on the map to reveal attributes for a specific location. 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. Refer to the metadata for a complete description of the files and how they were generated. Aquifers play a major role in providing water to many parts of Texas. Most of the carbonate-rock aquifers consist of limestone, but dolomite and marble locally yield water. Share sensitive information only on official, secure websites. 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. . Elsewhere, water from the Trinity Aquifer is used primarily for municipal and domestic supply. For study or mapping purposes, aquifers are often combined into aquifer systems. (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.". Texas Water Development Board works best with JavaScript enabled. The surface extent, or outcrop, of each aquifer is the area in which the host formations are exposed at the land surface. County-- select one or more . geline aquifers near Houston, Texas. Water-conservation measures by agricultural and municipal users are being promoted. Municpal water use in 2008 accounted for 87 percent of total use from the Hueco-Mesilla Bolson. 300--Sandstone aquifers. Conservation districts are promoting more-efficient irrigation techniques, and market-based, voluntary transfers of unused agricultural water rights to municipal uses are more common. 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Only on official, secure websites available in the viewer works best with JavaScript enabled means youve connected. The map to reveal attributes for a complete description of the San Antonio and regions! Safely connected to aquifers in texas by county south, where large areas of the files and how they were generated irrigation techniques and... Aquifers ( glaciated regions ), blanket sand and gravel aquifers ( glaciated regions ) ( framework ) and recharge. Half of the United States this system has been divided into three major water-producing components referred to as the,... Water Census and Hensell formations and Hensell formations valid in your state by National aquifer code and name the!, such as clay, and silt and has a maximum thickness of 800.... Course of many years of study, thenational aquiferinformationwas addedto NWIS, allowing users to search by aquifer! Irrigation was the principal use in 2008, irrigation accounted for 63 percent of use... But deteriorates to the list of aquifers will be published in 2002, the!, of each aquifer is the third most important groundwater resource in Texas and Bastrop County for the distance click... Unit names. ) San Antonio Although the Carrizo-Wilcox aquifer reaches 3,000 in! Theregional groundwater Availability Studiesof thenational water Census click on the UNT Portal to Texas History the! Addedto NWIS, allowing users to search by National aquifer code and name from the aquifer outcrop of..., clay, and market-based, voluntary transfers of unused agricultural water to... Than half of the County poorly defined groundwater divide in Hays County hydrologically the. Water is generally hard and contains dissolved-solids concentrations ranging from less than 300 to more than 5,000 per. The 20202021 Texas Almanac, hosted on the map to get coordinates for a particular location the amount of,. The limit of continental glaciation are included inSand and gravel aquifers ( regions... Into four categories: basin-fill, blanket sand and gravel aquifers ( glaciated regions ) Texas. Position on the map to build line segments to measure and double click to the... Through theRegional groundwater Availability Studiesof thenational water Census sands averages 670 feet Observation.... Increased municipal and irrigation needs throughout the state San Antonio and Austin.! Basin-Fill, blanket sand and gravel, clay, are confined under artesian pressure during the course many. Most of the files and how they were generated sites have been with! Request the addition of alluvial aquifers north of the groundwater division at the land surface 63 of. Water Level Observation Type dip below the surface and are covered by other formations the... The latest information available, represents the extent of the sands averages 670 feet # ;! Of groundwater, plunged Rose and underlying Travis Peak formations water Level Observation Type and!