Igneous Aquiferinteractive map | cross-section

Summary

The Igneous Aquifer, located in Far West Texas, is designated as a minor aquifer. The aquifer consists of volcanic rocks made up of a complex series of welded pyroclastic rock, lava, and volcaniclastic sediments and includes more than 40 different named units as much as 6,000 feet thick. Freshwater saturated thickness averages about 1,800 feet. The best waterbearing zones are found in igneous rocks with primary porosity and permeability, such as vesicular basalts, interflow zones in lava successions, sandstone, conglomerate, and breccia. Faulting and fracturing enhance aquifer productivity in less permeable rock units.

Although water in the aquifer is fresh and contains less than 1,000 milligrams per liter of total dissolved solids, elevated levels of silica and fluoride have been found in water from some wells, reflecting the igneous origin of the rock.

Water is primarily used to meet municipal needs for the cities of Alpine, Fort Davis, and Marfa, as well as some agricultural needs. There have been no significant water level declines in wells measured by the TWDB throughout the aquifer.

Reports

ID Date Type Description
GMA4_DFC_01 8/13/2010 DFC submission Desired future conditions for the Bone Spring-Victorio Peak, Capitan Reef Complex, Edwards-Trinity (Plateau), Igneous, Marathon, Presidio-Redford Bolson, Rustler, Upper Salt Basin, and West Texas Bolsons aquifers
R-356 12/1/2001 TWDB numbered report Aquifers of West Texas
R-016 2/1/1966 TWDB numbered report Water-Level Data from Observation Wells in Culberson, Jeff Davis, Presidio, and Brewster Counties, Texas
GT10-028 7/29/2010 GAM task Predictive simulations for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GT10-026 6/24/2010 GAM task Predictive simulation for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR10-003 6/29/2010 GAM run Predictive simulations for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR09-025 1/11/2011 GAM run Predictive simulation for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR08-088_MP 3/17/2009 GAM run - Management Plan Management plan information for Presidio County UWCD
GR08-029_MP 5/28/2008 GAM run - Management Plan Management plan information for Jeff Davis County UWCD
GR08-024 12/19/2008 GAM run Predictive simulations for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR07-008_MP 4/26/2007 GAM run - Management Plan Management plan information for Brewster County GCD
GR06-032 5/2/2007 GAM run Predictive simulation for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR06-017 7/18/2006 GAM run Predictive simulation for the Igneous and West Texas Bolsons aquifers in Groundwater Management Area 4
GR06-004 3/8/2006 GAM run Predictive simulation for the Igneous and West Texas Bolsons aquifers in Jeff Davis and Presidio countie
GR06-002_MP 3/1/2006 GAM run - Management Plan Management plan information for Culberson County GCD
GR05-040 2/7/2006 GAM run Predictive simulation for the Igneous and West Texas Bolsons aquifers in Jeff Davis and Presidio counties
GR10-036_MAG 6/22/2011 GAM run - MAG Managed available groundwater estimates for the Igneous Aquifer in Groundwater Management Area 4
GR11-018_MP 1/23/2012 GAM run - Management Plan Culberson County GCD Management Plan
GR12-023_MP 8/10/2012 GAM run - Management Plan Management plan data for Jeff Davis County UWCD
R-380 7/1/2011 TWDB numbered report Aquifers of Texas
GR12-026_MP 3/21/2013 GAM run - Management Plan Management plan data for Presidio County UWCD
GT13-027_TERS 9/19/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 3
GT13-030_TERS 10/2/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 7
GR13-020_MP 10/7/2013 GAM run - Management Plan Management Plan data for Brewster County GCD
GT13-028_TERS 1/15/2014 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 4
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