Ellenburger-San Saba Aquiferinteractive map | cross-section

Summary

The Ellenburger−San Saba Aquifer is a minor aquifer that is found in parts of 15 counties in the Llano Uplift area of Central Texas. The aquifer consists of the Tanyard, Gorman, and Honeycut formations of the Ellenburger Group and the San Saba Limestone Member of the Wilberns Formation. The aquifer consists of a sequence of limestone and dolomite that crop out in a circular pattern around the Llano Uplift and dip radially into the subsurface away from the center of the uplift to depths of approximately 3,000 feet. Regional block faulting has significantly compartmentalized the aquifer. The maximum thickness of the aquifer is about 2,700 feet. Water is held in fractures, cavities, and solution channels and is commonly under confined conditions. The aquifer is highly permeable in places, as indicated by wells that yield as much as 1,000 gallons per minute and springs that issue from the aquifer, maintaining the base flow of streams in the area.

Water produced from the aquifer is inherently hard and usually has less than 1,000 milligrams per liter of total dissolved solids. Fresh to slightly saline water extends downdip to depths of approximately 3,000 feet. Elevated concentrations of radium and radon also occur in the aquifer.

Most of the groundwater is used for municipal purposes, and the remainder for irrigation and livestock. A large portion of water flowing from San Saba Springs, which is the water supply for the city of San Saba, is thought to be from the Ellenburger−San Saba and Marble Falls aquifers.

Reports

ID Date Type Description
GMA7_DFC_01 7/29/2010 DFC submission Desired future conditions for the Capitan Reef Complex, Dockum, Edwards-Trinity (Plateau), Ellenburger-San Saba, Hickory, Lipan, Marble Falls, Ogallala, and Rustler aquifers
GMA9_DFC_01 8/29/2008 DFC submission Desired future conditions for the Edwards Group of the Edwards-Trinity (Plateau), Ellenburger-San Saba, Hickory, and Marble Falls aquifers
GMA8_DFC_02 5/19/2008 DFC submission Desired future conditions for the Ellenburger-San Saba, Hickory, and Marble Falls aquifers
B-6310 12/1/1973 Groundwater bulletin Reconnaissance Investigation of the Ground-Water Resources of the Brazos River Basin, Texas
R-046 5/1/1967 TWDB numbered report Occurrence and Quality of Ground Water in Brown County, Texas
R-057 9/1/1967 TWDB numbered report Occurrence and Quality of Ground Water in Coleman County, Texas
R-235 7/1/1979 TWDB numbered report Occurrence, Availability, and Chemical Quality of Ground Water in the Edwards Plateau Region of Texas
R-174 7/1/1973 TWDB numbered report Ground-Water Resources of Blanco County, Texas
R-360 2/9/2004 TWDB numbered report Conference Proceedings: Aquifers of the Edwards Plateau
R-346 3/1/1996 TWDB numbered report The Paleozoic and Related Aquifers of Central Texas
R-339 8/1/1992 TWDB numbered report Evaluation of Ground-Water Resources of the Paleozoic and Cretaceous Aquifers in the Hill Country of Central Texas
B-6519 8/1/1965 Groundwater bulletin Ground-Water Conditions in Menard County, Texas
AA08-08 8/31/2010 Aquifer assessment Desired future condition scenarios for the Ellenburger-San Saba Aquifer in Groundwater Management Area 7
AA10-04 9/10/2010 Aquifer assessment Desired future condition scenarios for the Ellenburger-San Saba Aquifer in Groundwater Management Area 7
GMA8_DFC_05 4/27/2011 DFC submission Desired future conditions for the Blossom, Brazos River Alluvium, Edwards (Balcones Fault Zone), Ellenburger-San Saba, Hickory, Marble Falls, Nacatoch, Trinity, and Woodbine aquifers
AA10-01_MAG 6/22/2011 Aquifer assessment MAG Managed available groundwater estimates for the Ellenburger-San Saba Aquifer in Groundwater Management Area 9
AA08-03_MAG 12/10/2009 Aquifer assessment MAG Managed available groundwater estimates for the Ellenburger-San Saba Aquifer in Groundwater Management Area 8
AA10-15_MAG 12/30/2011 Aquifer assessment MAG Modeled available groundwater estimates for the Ellenburger-San Saba Aquifer in Groundwater Management Area 8
AA10-10_MAG 11/1/2011 Aquifer assessment MAG Modeled available groundwater for the Ellenburger-San Saba Aquifer in Groundwater Management Area 7
CR-1004831116 7/11/2012 Contract report Aquifer Test and Related Well Information from Public Water Supply Wells in Groundwater Management Area 8
R-380 7/1/2011 TWDB numbered report Aquifers of Texas
GT13-030_TERS 10/2/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 7
GT13-032_TERS 10/2/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 9
GT13-031_TERS 1/15/2014 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 8