To learn more, visit theNational Aquifer Code Reference List. In 2005,thenational aquiferinformationwas addedto NWIS, allowing users to search by national aquifer code and name from the reference list below. He got the county through the crisis, and thanks to some heavy rains in 2012, the aquifer rebounded a little. It is composed of several smaller aquifers contained within the Trinity Group. Groundwater encountered within this area is normally under unconfined, water-table conditions and is most susceptible to contamination. 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 An official website of the United States government. 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. 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. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. Page Contact Information: Texas Water Data Maintainer Page Last Modified: 2023-02-25 01:14:50 EST 600--Igneous and metamorphic-rock aquifers. Irrigation pumping accounts for slightly more than half the water pumped, and pumping for municipal supply accounts for another 40 percent. (March 2005), Surficial aquifer system: removed the following States from the valid list: Delaware, Maryland, New Jersey, Virginia. Aquifers with this characteristic are common, although not exclusive, east and south of Interstate Highway 35. The aquifer is one of the most extensive and highly used groundwater resources in Texas. Computer models of the northern and southern portions of the Ogallala aquifer were completed by the Texas Water Development Board and its contractor. 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. In most places where these two rock types are interbedded, the carbonate rocks yield much more water than the sandstone. ASR is the process of capturing water from heavy rainfall and injecting it into underground water wells where it is stored for later use. For Geophysical Well Log assistance contact. Does your community have an annual fair or festival you'd like to have listed on our site, or in the next Texas Almanac? Select the area, distance or location tool below. The surface extent, or outcrop, of each aquifer is the area in which the host formations are exposed at the land surface. The Carrizo-Wilcox Aquifer has long been utilized by private well owners, municipalities, agricultural producers and industry. 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. Total ground-water withdrawals were 76,500 million gallons per day, or 85,800 thousand acre-feet per year for these three uses. 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. Groundwater movement in sandstone aquifers primarily is along bedding planes, but joints and fractures provide avenues for the vertical movement of water. The information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. 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. It consists of the Hooper, Simsboro, and Calvert Bluff formations of the Wilcox Group and the overlying Carrizo Formation of the Claiborne Group. Texas Water Development Board works best with JavaScript enabled. In 2008, irrigation accounted for 43 percent of water pumped from the aquifer, and municipal supply accounted for 47 percent. These aquifers span many counties and most of the major aquifers extend beyond Texas borders. Please note that the maps do not show the entire extent of an aquifer, only itssubcropor outcrop area. For Geophysical Well Log assistance contact. (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.". January 31, 2023. Texas Water Development Board works best with JavaScript enabled. In Harris, Galveston, Fort Bend, Jasper, and Wharton counties, water level declines of as much as 350 feet have led to land subsidence. This is an important step in planning for water in Texas and Bastrop County for the next 50 years. For study or mapping purposes, aquifers are often combined into aquifer systems. . Delineations of the downdip boundaries of such aquifers as the Edwards (BFZ), Trinity, and Carrizo-Wilcox are based on chemical quality criteria. Larry French, director of the groundwater division at the Texas Water Development Board, spoke to Texas Standard about its potential . Groundwater movement is generally toward the southeast. However, because these aquifers extend over large areas, large volumes of water can be withdrawn. For the location tool click on the map to get coordinates for a particular location. County-- select one or more . 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. Elsewhere, the aquifer supplies fresh but hard water for municipal, domestic, and livestock use. Texas Water Development Board works best with JavaScript enabled. A .gov website belongs to an official government organization in the United States. Water levels in the Trinity Aquifer, the county's main source of groundwater, plunged. Irrigation pumpage accounted for 94 percent of the total use from the aquifer in 2008. Water from the Antlers portion is used mainly for irrigation in the outcrop area of North and Central Texas. The Ground Water Atlas of the United States is available onlineas anHTML website, asdownloadable PDFs, andoravailable for purchasethrough the USGS Store. Most water from aquifers is used for irrigation. 500--Sandstone and carbonate-rock aquifers. The Catahoula Aquifer is considered an Alternative Water Source (AWS) in Montgomery County. In general, groundwater is fresh but very hard in the outcrop of the aquifer. Adopt the TX Town or County of your choice and share your message with the world. 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. Get your free copy of the 20202021 Texas Almanac eBook. It is the third most important groundwater resource in Texas after the Edwards and the Ogallala aquifers. The Maverick Aquifer, as it's been named, lies more than a mile deep under parts of Maverick, Uvalde, Dimmit and Kinney Counties. 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. Water to the north of the Canadian River is generally fresh, with total dissolved solids typically less than 400 milligrams per liter. 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. 400--Carbonate-rock aquifers. The competition for ground water from the Edwards aquifer has created some controversial water issues in central Texas. 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. (March 2005). Some of the state's largest water level declines, ranging from 350 to more than 1,000 feet, have occurred in counties along the IH-35 corridor from McLennan County to Grayson County. 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. 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. (February 2005), Valley and Ridge carbonate-rock aquifers were removed:these now should be included in Valley and Ridge aquifers. Aquifers covered by less permeable formations, such as clay, are confined under artesian pressure. Water Systems If you have any questions or concerns regarding the material on this page, please contact the Comptrollers Data Analysis and Transparency Division. Elsewhere, water from the Trinity Aquifer is used primarily for municipal and domestic supply. Near the plateaus edge, flow is toward the main streams, where the water issues from springs. 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. 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. 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). 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 distance tool click points on the map to build line segments to measure and double click to complete the measurement. Located west of the Franklin Mountains, the Mesilla Bolson reaches up to 2,000 feet in thickness and contains three separate water-producing zones. 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). 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. This dataset, published in 2002, represents the extent of the alluvial and glacial aquifers north of the southern-most line of glaciation. For the location tool click on the map to get coordinates for a particular location. 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. Local aquifer: Not all groundwater sites have been associated with a local aquifer. 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 Individual accumulations vary greatly in thickness, but most of the Seymour is less than 100 feet. They are grouped into four categories: basin-fill, blanket sand and gravel, glacial-deposit, and stream-valley aquifers. 9999--Areas that are not a national aquifer. 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. The effects of over-pumping removing more groundwater than what is entering an aquifer pose continual challenges for aquifer managers across the state. 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. Aquifers are vital to the states economy and environment, highlighting the need for their proper management and conservation. Water Tour | Aquifers Overview | Print Snapshot (PDF). Such sites will not be retrieved using this search criteria. Igneous and metamorphic-rock aquifers can be grouped into two categories: crystalline-rock and volcanic-rock. Semiconsolidated aquifers consist of semiconsolidated sand interbedded with silt, clay, and minor carbonate rocks Sandstone aquifers are more widespread than those in all other kinds of consolidated rocks. 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 aquifer consists of sand, gravel, clay, and silt and has a maximum thickness of 800 feet. San Antonio Historical large-scale groundwater withdrawals, especially for the municipal uses of El Paso and Juarez, have caused major water-level declines and significantly changed the direction of flow, causing a deterioration of the chemical quality of the groundwater in the aquifer, according to El Paso Water Utilities and the USGS. The Texas Water Development Board (TWDB) specifically disclaims any and all liability for any claims or damages that may result from providing these data. 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 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. Water Use. The Geologic Atlas of Texas illustrates the surface extent of geologic formations (and aquifers) across the state. And so we've seen water levels drop in those aquifers and we've seen spring flows as a response also drop. Sulfate and chloride concentrations also tend to increase with depth. The aquifer is comprised of the Twin Mountains, Glen Rose, Paluxy, Hosston, and Hensell formations. ; 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 . Note that alluvial aquifers north of the limit of continental glaciation are included inSand and gravel aquifers (glaciated regions). The name of N600NECRSN was changedfrom "New England crystalline-rock aquifers" to "New York and New England crystalline-rock aquifers" to better reflect the geographic extent (January 2015). The appropriate component aquifer should be used instead of Northern Great Plains. Texas Gulf Coast Groundwater and Land Subsidence Over Forty Years of Research in the Houston-Galveston Region. 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. New and Environmentally Improved. These aquifers are located in El Paso and Hudspeth counties in far West Texas and occur in Tertiary and Quaternary basin-fill deposits that extend northward into New Mexico and westward into Mexico. It consists of the Hooper, Simsboro, and Calvert Bluff formations of the Wilcox Group and the overlying Carrizo Formation of the Claiborne Group. 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. 300--Sandstone aquifers. The Ordovician age Ellenburger aquifer is a fractured limestone and dolomite and is present in the southeastern and northwestern portions of the county. The information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. 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. Located in the upper Pecos River Valley of West Texas, this aquifer, formerly called the Cenozoic Pecos Alluvium, extends through 12 counties. This list of national principal aquifer codes and names are fixed values assigned by the National Water Information System (NWIS). Major Aquifers of Texas [Map] Author: Texas Water Development Board (TWDB) Year: 2006: Document Number: 1295: HCP EIS Reference: . Below are publications associated with national aquifers. 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. The aquifer is primarily composed of sand locally interbedded with gravel, silt, clay, and lignite. Click any position on the map to reveal attributes for a specific location. Water-conservation measures by agricultural and municipal users are being promoted. The Trinity Aquifer is a major aquifer that extends across much of the central and northeastern part of the state. A lock () or https:// means youve safely connected to the .gov website. (.pdf file). 6 character identifier derived from the aquifer name using the code derivation procedure also used for GWSI geohydrologic unit names. Latitude (DD) Longitude (DD) County. Proceeds benefit education in TX. 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. TWDB maps depict the 9 major and 21 minor aquifers. 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. A two-dimensional map representation of the principal aquifers of the Nation is shown below. January 31, 2023. 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. 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 Ogallala Aquifer is the largest aquifer in the United States and is a major aquifer of Texas underlying much of the High Plains region. storage and recovery facility Map of major and minor aquifers in Texas. Aquifers in carbonate rocks are most extensive in the eastern U.S. Eastward-flowing streams during the Quaternary Period deposited discontinuous beds of poorly sorted gravel, sand, silt, and clay that were later dissected by erosion, resulting in the isolated remnants of the formation. Click any position on the map to reveal attributes for a specific location. AWUDS has a graphical user interface that facilitates data entry, revision, review, and approval. Edwards Aquifer Map Viewer. Texas has numerous aquifers capable of producing groundwater for households, municipalities, industry, farms, and ranches. The areal and vertical location of major aquifers is fundamental to the determination of groundwater availability for the Nation. The San Antonio River Authority also has a number of flood-control structures that effectively recharge the aquifer. See more information on Water Issues and the Texas economy. In Texas, the Panhandle is the most extensive region irrigated with groundwater. Would you like to submit an article, provide feedback, or just get in touch? The Wilcox Group and overlying Carrizo Sand form a hydrologically connected system of sand locally interbedded with clay, silt, lignite, and gravel. A national layer, including all available SSA coverages, is available for use in GIS. 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. 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. You may need to request the addition of Alluvial aquifers to the list of aquifers valid in your State. About 32 percent of water used to meet municipal demands is from groundwater. In 2008, about 72 percent of pumpage from the aquifer was for municipal use. 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). 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. Freshwater saturated thickness averages 95 feet. The Hueco Bolson, located on the eastern side of the Franklin Mountains, consists of up to 9,000 feet of clay, silt, sand, and gravel and is an important source of drinking water for both El Paso and Juarez, Mexico. User Guide - This downloadable PDF document explains how to use the tools available in the viewer. 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. Spaces in crystalline rocks are microscopically small, few, and generally unconnected. Elevation (ft) Well Depth (ft) Water Level Observation Type. Aquifers play a major role in providing water to many parts of Texas. 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. The aquifer also feeds several well-known recreational springs and underlies some of Texas most environmentally sensitive areas. 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). Some water-bearing formations dip below the surface and are covered by other formations. H2Oaks is 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. Official websites use .gov 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 aquifer consists of sand, gravel, clay, and silt and has a maximum thickness of 800 feet. Most of the water pumped from the aquifer is used for irrigation. In scattered places in the United States, carbonate rocks are interbedded with almost equal amounts of water-yielding sandstone. Last fall while exploring for oil and gas deposits in southwest Texas, a driller instead found a huge freshwater deep aquifer. Water Quality Available. Declines continue in Ward County due to increased municipal and industrial pumping. Five GCD's (Red on the map), the GMA12, are required to work together to set these conditions for the Carrizo-Wilcox Aquifer. It is part of the U.S. Geological Survey National Water Information System. Although the Carrizo-Wilcox Aquifer reaches 3,000 feet in thickness, the freshwater saturated thickness of the sands averages 670 feet. 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. Water quality is generally good northeast of the San Antonio River basin, but deteriorates to the southwest. However, some individual aquifers serve mostly municipal purposes. . 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]. These aquifers, which are in rocks that range in age from Pleistocene to Cambrian, 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. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. Select the area, distance or location tool below. Beets will help keep Bexar County roads from freezing this week. Years of heavy pumpage have caused significant water-level declines in portions of the aquifer. 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. The surficial aquifer in the Coastal Plain of these States should be included in the Northern Atlantic Coastal Plain aquifer system. Refer to the metadata for a complete description of the files and how they were generated. 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 Aggregate Water-Use Data System (AWUDS) is the database management system used to enter, store, and analyze state aggregate water-use data. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. 1, Total pumping estimates for the Ogallala, Edwards-Trinity (High Plains), and Dockum aquifers in High Plains UWCD No. We'd love to hear from you. Each PA was sampled across its lateral extent using an equal-area grid, typically with 60 wells. 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. N or S, where N = aquifer, S = aquifer system, 3 digit number = rock type (4 digits used for "Other" to fill out the code), 100-- Sand and gravel aquifers200--Semiconsolidatedsand aquifers (not used)300--Sandstone aquifers400--Carbonate-rock aquifers500--Sandstone and carbonate-rock aquifers600--Igneous and metamorphic-rock aquifers9999--Areas that are not a national aquifer, 6 character identifier derived from the aquifer name using thecode derivation procedure also used for GWSI geohydrologic unit names. Aquiferinformationwas addedto NWIS, allowing users to search by national aquifer Bastrop County for the tool. 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Nation is shown below main streams, where the water pumped from the aquifer of... Valley and Ridge carbonate-rock aquifers were removed: these now should be used instead of Northern Great Plains System NWIS. Tour | aquifers Overview | Print Snapshot ( PDF ) click any position on the map to get for... But hard water for municipal, domestic, and Hensell formations tool click on the aquifers in texas by county to coordinates. Choice and share your message with the world 9 major and minor aquifers 2023-02-25 01:14:50 EST 600 -- and. Overview | Print Snapshot ( PDF ) of Texas most environmentally sensitive areas review, and Hensell.... - this downloadable PDF document explains how to use the tools available in the viewer PA sampled. 800 feet in crystalline rocks are microscopically small, few, and lignite common, although not exclusive east... ) across the state this dataset, published in 2002, represents the extent of aquifer. 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