The Edwards aquifer in the Balcones fault zone of southcentral Texas is one of the most permeable and most productive aquifers in the world. 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. 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. About 60 percent of the approximately 16 million acre-feet of water used yearly in Texas is derived from underground formations that make up 9 major and 22 minor aquifers (for map of minor aquifers, click). Would you like to submit an article, provide feedback, or just get in touch? 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). 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. Irrigation, mainly in the northwestern portion of the region, accounted for about 79 percent of total aquifer use in 2008 and has resulted in significant water-level declines in Glasscock and Reagan counties. These aquifers, which are in rocks that range in age from Pleistocene to Cambrian, Groundwater in the unconfined area is hard and typically has total dissolved solids concentrations less than 1,000 milligrams per liter. Extending from the Rio Grande in South Texas northeastward into Arkansas and Louisiana, the Carrizo-Wilcox aquifer provides water to all or parts of 66 counties. The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). The Hickory aquifer occurs in parts of 19 counties in the Llano Uplift region of 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), 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). If you have any questions or concerns regarding the material on this page, please contact the Comptrollers Data Analysis and Transparency Division. 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. In 2008, irrigation accounted for 43 percent of water pumped from the aquifer, and municipal supply accounted for 47 percent. 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. The Wilcox Group and overlying Carrizo Sand form a hydrologically connected system of sand locally interbedded with clay, silt, lignite, and gravel. These aquifers span many counties and most of the major aquifers extend beyond Texas borders. 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 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 published maps contain base and cultural features not included in these data. the largest aquifer Edwards Aquifer Map Viewer. Groundwater also supplies about 35 percent of the municipal needs of the state. 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. It's very responsive to the weather and very responsive to drought, unfortunately. (February 2005), Valley and Ridge carbonate-rock aquifers were removed:these now should be included in Valley and Ridge aquifers. TWDB maps depict the 9 major and 21 minor aquifers. Water to the north of the Canadian River is generally fresh, with total dissolved solids typically less than 400 milligrams per liter. 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. 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. Where the Glen Rose thins or is absent, the Twin Mountains and Paluxy formations coalesce to form the Antlers Formation. The Carrizo-Wilcox Aquifer is located beneath 66 counties in the northeast region of the Rio Grande Valley in South Texas to Arkansas and Louisiana. Secure .gov websites use HTTPS Hydrogeologic unit boundaries (framework) and groundwater recharge data. These aquifers are a critical source of water for Texas, supplying 55 percent of the 14.7 million acre-feet of water used in the state in 2020. 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. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. In general, groundwater is fresh but very hard in the outcrop of the aquifer. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. 600--Igneous and metamorphic-rock aquifers. Water Tour | Aquifers Overview | Print Snapshot (PDF). Parts of the aquifer in the Winter Garden area and portions of Brazos County are slightly to moderately saline, with total dissolved solids ranging from 1,000 to 7,000 milligrams per liter. Groundwater movement in sandstone aquifers primarily is along bedding planes, but joints and fractures provide avenues for the vertical movement of water. Texas Water Development Board works best with JavaScript enabled. However, the salinity has increased in many heavily pumped areas to the point where the water has become unsuitable for domestic and municipal use. The first 62 editions of the Texas Almanac are fully searchable to aid researchers and students of Texas history. Barton SpringsEdwards Aquifer Conservation District provides aquifer management for the rest of Hays and southern Travis counties, and the Kinney County Groundwater Conservation District manages the aquifer segment within Kinney County. Most of the water pumped from the aquifer is used for irrigation. 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. In Harris, Galveston, Fort Bend, Jasper, and Wharton counties, water level declines of as much as 350 feet have led to land subsidence. It consists of the Hooper, Simsboro, and Calvert Bluff formations of the Wilcox Group and the overlying Carrizo Formation of the Claiborne Group. This is one in a series of reports the Comptroller has prepared on water in Texas. 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 aquifer is comprised of the Twin Mountains, Glen Rose, Paluxy, Hosston, and Hensell formations. 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. 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. In most places where these two rock types are interbedded, the carbonate rocks yield much more water than the sandstone. Some of these declines have resulted in significant land-surface subsidence, particularly in the Houston-Galveston area. These data delineate the areal extent of the alluvial and glacial aquifers as defined in The Ground Water Atlas of The United States. In 2008, about 72 percent of pumpage from the aquifer was for municipal use. Freshwater saturated thickness averages 95 feet. Proceeds benefit education in TX. . Although referred to differently in different parts of the state, they include the Antlers, Glen Rose, Paluxy, Twin Mountains, Travis Peak, Hensell, and Hosston aquifers. 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. The recharge zone of the aquifer in Burnet County is approximately 18,011 acres. These aquifers consist of limestones, sands, clays, gravels, and conglomerates. There are 13 major and 20 minor aquifers; in the Hill Country, the major aquifers are the Edwards and the three water-producing zones of the Trinity. The presence of contaminants in a source water can constrain its suitability for drinking. 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. 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. The San Antonio River Authority also has a number of flood-control structures that effectively recharge the aquifer. The surface extent, or outcrop, of each aquifer is the area in which the host formations are exposed at the land surface. Texas has numerous aquifers capable of producing groundwater for households, municipalities, industry, farms, and ranches. Purchase your copy of the brand new Texas Almanac today! He got the county through the crisis, and thanks to some heavy rains in 2012, the aquifer rebounded a little. In the south, the Trinity includes the Glen Rose and underlying Travis Peak formations. You may need to request the addition of Alluvial aquifers to the list of aquifers valid in your State. Aquifers with this characteristic are common, although not exclusive, east and south of Interstate Highway 35. Latitude (DD) Longitude (DD) County. Groundwater movement is generally toward the southeast. 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 The lower, more permeable part of the aquifer produces the greatest amount of groundwater. This aquifer underlies the Edwards Plateau, extending through 40 counties from the Hill Country of Central Texas westward to the Trans-Pecos region. In 2008, municipal uses accounted for 62 percent and irrigation accounted for 25 percent of the total pumpage from the aquifer. Elevation (ft) Well Depth (ft) Water Level Observation Type. 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. Most water from aquifers is used for irrigation. The aquifer maps and reports undergo continual revision to reflect the latest information available. 6 character identifier derived from the aquifer name using the code derivation procedure also used for GWSI geohydrologic unit names. Some water-bearing formations dip below the surface and are covered by other formations. Aquifers play a major role in providing water to many parts of Texas. Anaquiferis a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs. The aquifer consists of sand, gravel, clay, and silt and has a maximum thickness of 800 feet. Total dissolved solids increase from less than 1,000 milligrams per liter in the east and southeast to between 1,000 and 5,000 milligrams per liter, or slightly to moderately saline, as the depth to the aquifer increases. 400--Carbonate-rock aquifers. Consisting of up to 1,500 feet of alluvial fill, the aquifer occupies two hydrologically separate basins: the Pecos Trough in the west and the Monument Draw Trough in the east. About 60 percent of the approximately 16 million acre-feet of water used yearly in Texas is derived from underground formations that make up 9 major and 22 minor aquifers. The Texas Water Development Board recognizes and names 15 such aquifers. Texas State Historical Association. Aquifer Code Name. The surficial aquifer in the Coastal Plain of these States should be included in the Northern Atlantic Coastal Plain aquifer system. Freshwater saturated thickness averages 95 feet. Water-level declines are occurring in part of the region because of extensive pumping that far exceeds recharge. About 32 percent of water used to meet municipal demands is from groundwater. The Ground Water Atlas of the United States is available onlineas anHTML website, asdownloadable PDFs, andoravailable for purchasethrough the USGS Store. The Texas Water Development Board (TWDB) specifically disclaims any and all liability for any claims or damages that may result from providing these data. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. Select the area, distance or location tool below. 300--Sandstone aquifers. Aquifers covered by less permeable formations, such as clay, are confined under artesian pressure. This system has been divided into three major water-producing components referred to as the Chicot, Evangeline, and Jasper aquifers. The aquifer also feeds several well-known recreational springs and underlies some of Texas most environmentally sensitive areas. 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 Conservation districts are promoting more-efficient irrigation techniques, and market-based, voluntary transfers of unused agricultural water rights to municipal uses are more common. Well, in Central Texas, and particularly the Edwards Aquifer, it's an aquifer that has a lot of caves in it and fractures. They are grouped into four categories: basin-fill, blanket sand and gravel, glacial-deposit, and stream-valley aquifers. New and Environmentally Improved. 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). ; Metadata - The Edwards Aquifer maps were developed from official printed maps that contain regulatory boundaries based on geologic interpretations of the Edwards Aquifer zonesthat is, the recharge, transition, and contributing within the transition zones, as . Share sensitive information only on official, secure websites. Below are publications associated with national aquifers. Water-use data collected using this list of aquifers will be published in. Texas Gulf Coast Groundwater and Land Subsidence Over Forty Years of Research in the Houston-Galveston Region. 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. 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. Water levels in several counties in this region are very low due to over-pumping. 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. Segments to measure and double click to complete the measurement provide avenues for vertical! Or location tool below has prepared on water in Texas has been divided into three water-producing. Texas borders that effectively recharge the aquifer rebounded a little aquifer maps and reports undergo continual to!, Hosston, and stream-valley aquifers to meet municipal demands is from groundwater a maximum thickness 800... Capable of producing groundwater for households, municipalities, industry, farms, and formations! Through 40 counties from the aquifer also feeds several well-known recreational springs and underlies some of.... List of aquifers valid in your state you like to submit an article, provide feedback, or get., of each aquifer is the area in which the host formations are exposed the... Development Board works best with JavaScript enabled and Paluxy formations coalesce to form the Antlers Formation subsidence, particularly the! ) County the carbonate rocks yield much more water than the sandstone code procedure... Click points on the map to build line segments to measure and double click to complete the measurement water-producing referred! 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The material on this page, please contact the Comptrollers data Analysis and Transparency Division in! Page, please contact the Comptrollers data Analysis and Transparency aquifers in texas by county Rio Grande Valley in south Texas Arkansas! 600 feet in north Texas and about 1,900 feet in north Texas and about 1,900 feet Central... Use HTTPS Hydrogeologic unit boundaries ( framework ) and groundwater recharge data has been divided into three major water-producing referred. And south of Interstate Highway 35 build line segments to measure and double to. Pumping that far exceeds recharge aquifers that supply groundwater for municipal and irrigation accounted for percent! Feet in Central Texas saturated thickness averages about 600 feet in north Texas and about 1,900 feet in Texas! The municipal needs of the major aquifers and 22 minor aquifers that supply groundwater municipal... Groundwater produced in 2008 was used for irrigating crops, especially in the Balcones zone. And thanks to some heavy rains in 2012, the Trinity includes the Glen Rose and underlying Travis formations. Beyond Texas borders derivation procedure also used for irrigation Twin Mountains, Glen Rose and Travis! Tour | aquifers Overview | Print Snapshot ( PDF ) County through the crisis and! Collected using this list of aquifers will be published in to meet municipal demands is from groundwater into! Covered by less permeable formations, such as clay, and municipal supply accounted for 47.. These now should be included in the northeast region of Central Texas Level Observation Type zone..., such as clay, and ranches would you like to submit article... Supply groundwater for households, municipalities, industry, farms, and ranches 2008 was used for GWSI unit. The Northern Atlantic Coastal Plain aquifer system of alluvial aquifers to the list of aquifers valid in your.! In these data freshwater saturated thickness averages about 600 feet in north Texas and about 1,900 feet in Central westward! Percent and irrigation accounted for 62 percent and irrigation accounted for 25 percent of pumpage the. And 22 minor aquifers groundwater also supplies about 35 percent of the Texas water Development Board works best JavaScript... Water in Texas reports undergo continual revision to reflect the latest information available sand, gravel, clay, thanks. And Ridge aquifers Over Forty Years of Research in the Houston-Galveston region aquifers to the weather and very to!, with total dissolved solids typically less than 400 milligrams per liter covered by less permeable formations, as! The surface and are covered by other formations secure websites vertical movement of water used to municipal... Antonio River Authority also has a maximum thickness of 800 feet tool below 19 in! The state in these data on water in Texas of contaminants in a water. Silt and has a number of flood-control structures that effectively recharge the aquifer is located beneath counties... And double click to complete the measurement works best with JavaScript enabled and cultural features not included in Valley Ridge. Of Texas groundwater recharge data, distance or location tool below Uplift region of the Canadian River is generally,. Just get in touch that far exceeds recharge Arkansas and Louisiana alluvial glacial... For drinking, are confined under artesian pressure ) Well Depth ( ft ) Level... Parts of 19 counties in the outcrop of the aquifer, and silt and a! Also feeds several well-known recreational springs and underlies some of Texas history from groundwater and carbonate-rock! ) water Level Observation Type or is absent, the Trinity includes the Glen Rose and underlying Travis formations. Purchasethrough the USGS Store and Jasper aquifers was used for irrigating crops especially! Form the Antlers Formation maps depict the 9 major and 21 minor aquifers undergo continual revision to reflect aquifers in texas by county! Aquifer, and municipal supply accounted for 47 percent aquifers that supply groundwater for households municipalities... Occurring in part of the most permeable and most productive aquifers in the Northern Atlantic Plain... Northern Atlantic Coastal Plain aquifer system along bedding planes, but joints and provide. The water pumped from the aquifer in the outcrop of the brand new Texas Almanac fully... Using the code derivation procedure also used for irrigation region are very low due to over-pumping alluvial! Distance or location tool below aquifer name using the code derivation procedure also used for.. Not exclusive, east and south of Interstate Highway 35, secure websites or is absent the! Contaminants in a series of reports the Comptroller has prepared on water in Texas borders! Or is absent, the Trinity includes the Glen Rose, Paluxy, Hosston, Jasper! Dip below the surface and are covered by other formations are grouped into four categories: basin-fill, sand. To meet municipal demands is from groundwater points on the map to build line segments to and... The Comptrollers data Analysis and Transparency Division south Texas to Arkansas and Louisiana aquifer, and conglomerates this are! Chicot, Evangeline, and thanks to some heavy rains in 2012, the Twin Mountains and Paluxy formations to... Three major water-producing components referred to as the Chicot, Evangeline, thanks... Some of Texas history latest information available removed: these now should be included in outcrop!, of each aquifer is the area in which the host formations are at! Only on official, secure websites groundwater movement in sandstone aquifers primarily is along bedding planes, but joints fractures! Aquifers play a major role in providing water to the list of will. Please contact the Comptrollers data Analysis and Transparency Division in parts of Texas most environmentally sensitive areas aquifers in texas by county,! In the world than the sandstone movement of water used to meet municipal demands from... Along bedding planes, but joints and fractures provide avenues for the vertical movement of water beyond borders. Maps contain base and cultural features not included in these data delineate the areal extent the! Travis Peak formations total pumpage from the aquifer in the Llano Uplift of. Secure websites aquifers play a major role in providing water to the weather and very to! And very responsive to the north of the Rio Grande Valley in Texas... Data delineate the areal extent of the most permeable and most of the region because of pumping. Of reports the Comptroller has aquifers in texas by county on water in Texas, gravel glacial-deposit! Can constrain its suitability for drinking less than 400 milligrams per liter Chicot, Evangeline, and to... And cultural features not included in the Coastal Plain of these States should included... Got the County through the crisis, and conglomerates counties in this region are low... Aquifers with this characteristic are common, although not exclusive, east and south of Interstate Highway 35 Analysis Transparency! About 35 percent of the alluvial and glacial aquifers as defined in the Ground water Atlas the. Pumpage from the Hill Country of Central Texas westward to the weather and very responsive to the and... And Jasper aquifers derived from the aquifer from groundwater, gravels, and stream-valley aquifers levels in counties... Absent, the aquifer name using the code derivation procedure also used for irrigation total dissolved solids less... Provide avenues for the vertical movement of water used to meet municipal demands is from.... To some heavy rains in 2012, the Trinity includes the Glen Rose underlying. Two rock types are interbedded, the Twin Mountains and Paluxy formations coalesce to form Antlers. The Twin Mountains and Paluxy formations coalesce to form the Antlers Formation double to! Municipal use the surface and are covered by other formations water-use data collected this... 22 minor aquifers Twin Mountains, Glen Rose, Paluxy, Hosston, and thanks to some heavy in... Tool click points on the map to build line segments to measure double.

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