Seymour Aquifer | Texas Water Development Board

Seymour Aquifer interactive map | cross-section

Aquifer Facts

  • Aquifer type: unconfined
  • Area of aquifer: 3,374 square miles
  • Proportion of aquifer with groundwater conservation districts: 62 percent
  • Number of counties containing the aquifer: 25

Summary

The Seymour Aquifer is a major aquifer extending across north central Texas. Water is contained in isolated pods of alluvial sediments as much as 360 feet thick composed of discontinuous beds of poorly sorted gravel, conglomerate, sand, and silty clay.

Water ranges from fresh to slightly saline, containing from approximately 100 to 3,000 milligrams per liter of total dissolved solids. However, moderately to very saline water exists in localized areas, with total dissolved solids ranging from 3,000 to more than 10,000 milligrams per liter. High nitrate concentrations are attributed to oxidation of soil organic nitrogen during initial cultivation followed by leaching of fertilizers on cultivated land. Excessive chloride and sulfate also occur throughout the aquifer. The Haskell-Knox counties pod of the aquifer has the highest probability for exceeding any primary drinking water standard.

Almost all of the groundwater pumped from the aquifer − 90 percent − is used for irrigation, with the remainder used primarily for municipal supply. It is reported that prior to significant land clearing and farming, the Seymour Aquifer was not a productive aquifer; the saturated thickness was inadequate to support pumping. Evapotranspiration losses decreased after the land was cleared, resulting in greater recharge and a gradual increase in the saturated thickness of the aquifer.

Reports

ID Date Type Description
Texas Aquifers Study 12/31/2016 Legislative Report Texas Aquifers Study: Groundwater Quantity, Quality, Flow, and Contributions to Surface Water
B-6310 12/1/1973 Groundwater bulletin Reconnaissance Investigation of the Ground-Water Resources of the Brazos River Basin, Texas
B-6521 8/1/1965 Groundwater bulletin Investigation of Ground-Water Contamination, Rhineland Area, Knox County, Texas
R-224 10/1/1978 TWDB numbered report Occurrence, Quantity, and Quality of Ground Water in Taylor County, Texas
R-337 3/1/1992 TWDB numbered report Evaluation of Water Resources in Parts of the Rolling Prairies Region of North-Central Texas
R-226 12/1/1978 TWDB numbered report Th Seymour Aquifer Ground-Water Quality and Availability in Haskell and Knox Counties, Texas, Volumes 1 & 2
R-119 7/1/1970 TWDB numbered report Ground-Water Resources of Collingsworth County, Texas
R-161 11/1/1972 TWDB numbered report Ground-Water Resources of Hardeman County, Texas
R-167 4/1/1973 TWDB numbered report Ground-Water Resources of Hall and Eastern Briscoe Counties, Texas
R-215 4/1/1978 TWDB numbered report Occurrence, Quality, and Availability of Ground Water in Jones County, Texas
R-218 7/1/1978 TWDB numbered report Occurrence and Quality of Ground Water in Baylor County, Texas
R-240 11/1/1979 TWDB numbered report Occurrence, Quality, and Quantity of Ground Water in Wilbarger County, Texas
GT11-006 6/3/2011 GAM task Predictive simulations for the Seymour and Blaine aquifers in Groundwater Management Area 6
GR10-021_MP 7/22/2010 GAM run - Management Plan Management plan information for Rolling Plains GCD
GR10-007_MP 7/20/2010 GAM run - Management Plan Management plan information for Gateway GCD
GR09-017_MP 7/24/2009 GAM run - Management Plan Management plan information for Clear Fork UWCD
GR08-057_MP 8/8/2008 GAM run - Management Plan Management plan information for Gateway GCD
GR08-054_MP 8/1/2008 GAM run - Management Plan Management plan information for Mesquite GCD
GR08-044 11/7/2008 GAM run Predictive simulation for the Seymour and Blaine aquifers in Groundwater Management Area 6
GR05-038 1/27/2005 GAM run Predictive simulation for the Seymour Aquifer in Collingsworth County
GR05-033 8/8/2005 GAM run Recharge information for the Seymour and Blaine aquifers in Knox, Baylor, and Haskell counties
GR05-017 5/16/2005 GAM run Saturated thickness maps for the Blaine and Seymour aquifers in Region A
GR05-006 3/21/2005 GAM run Water budget for Hardeman and Foard counties in Tri-County GCD
GR05-002 3/1/2005 GAM run Water budget for Fisher County
GR04-022 3/4/2005 GAM run Volume in storage for Seymour and Baline aquifers in Childress, Collingsworth, Hall, and Wheeler counties
R-380 7/1/2011 TWDB numbered report Aquifers of Texas
GR13-017_MP 8/7/2013 GAM run - Management Plan Management plan data for Mesquite GCD
GT13-025_TERS 8/20/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 1
GT13-026_TERS 9/19/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 2
GT13-029_TERS 9/19/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 6
GT13-030_TERS 10/2/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 7
GR14-007_MP 7/25/2014 GAM run - Management Plan Management plan data for Clear Fork GCD
GR14-013_MP 4/10/2015 GAM run - Management Plan Management plan data for Gateway GCD
GR14-009_MP 5/6/2015 GAM run - Management Plan Management plan data for Rolling Plains GCD
GR18-010_MP 5/3/2018 GAM run - Management Plan Management plan information for Mesquite GCD
GR19-020_MP 7/26/2019 GAM run - Management Plan Management plan information for Rolling Plains GCD
GR19-023_MP 10/1/2019 GAM run - Management Plan Management plan information for Gateway GCD
GR19-024_MP 10/1/2019 GAM run - Management Plan Management plan information for Clear Fork GCD
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