Pecos Valley Aquiferinteractive map | cross-section

Summary

The Pecos Valley Aquifer is a major aquifer in West Texas. Waterbearing sediments include alluvial and windblown deposits in the Pecos River Valley. These sediments fill several structural basins, the largest of which are the Pecos Trough in the west and Monument Draw Trough in the east. Thickness of the alluvial fill reaches 1,500 feet, and freshwater saturated thickness averages about 250 feet.

The water quality is highly variable, the water being typically hard, and generally better in the Monument Draw Trough than in the Pecos Trough. Total dissolved solids in groundwater from Monument Draw Trough are usually less than 1,000 milligrams per liter. The aquifer is characterized by high levels of chloride and sulfate in excess of secondary drinking water standards, resulting from previous oil field activities. In addition, naturally occurring arsenic and radionuclides occur in excess of primary drinking water standards.

More than 80 percent of groundwater pumped from the aquifer is used for irrigation, and the rest is withdrawn for municipal supplies, industrial use, and power generation. Localized water level declines in southcentral Reeves and northwest Pecos counties have moderated since the late 1970s as irrigation pumping has decreased; however, water levels continue to decline in central Ward County because of increased municipal and industrial pumping.

Reports

ID Date Type Description
HA-03 1/1/1995 Hydrologic atlas Water Quality in the Edwards-Trinity (Plateau) Aquifer, Edwards Plateau and Trans-Pecos, Texas
R-317 1/1/1990 TWDB numbered report Evaluation of Ground-Water Resources in Parts of Loving, Pecos, Reeves, Ward and Winkler Counties, Texas
GMA3_DFC_01 8/9/2010 DFC submission Desired future conditions for the Capitan Reef Complex, Dockum, Edwards-Trinity (Plateau), Pecos Valley, and Rustler aquifers
R-348 11/1/1999 TWDB numbered report Changes in Groundwater Conditions in Parts of Trans-Pecos, Texas, 1988 - 1998
R-356 12/1/2001 TWDB numbered report Aquifers of West Texas
B-5604 3/1/1956 Groundwater bulletin Ground-Water Resources of the Crane Sandhills, Crane County, Texas
R-360 2/9/2004 TWDB numbered report Conference Proceedings: Aquifers of the Edwards Plateau
R-078 5/1/1968 TWDB numbered report Ground-Water Resources of Upton County, Texas
GT10-033 1/3/2011 GAM task Average drawdown for the Edwards-Trinity (Plateau) and Pecos Valley aquifers within management zones in Middle Pecos GCD
GR09-035_D 8/7/2010 GAM run Predictive simulations for the Edwards-Trinity (Plateau) and Pecos Valley aquifers in Groundwater Management Area 7
GR08-075_MP 1/23/2009 GAM run - Management Plan Management plan information for Middle Pecos GCD
GR08-027_MP 5/21/2008 GAM run - Management Plan Management plan information for Crockett County GCD
GR04-020 10/7/2004 GAM run Effects of a new well field in Middle Pecos GCD
GR10-042_MAG 11/18/2011 GAM run - MAG Modeled available groundwater for the Edwards-Trinity (Plateau) and Pecos Valley aquifers in Groundwater Management Area 3
GR12-004_MP 7/20/2012 GAM run - Management Plan Management plan data for Crockett County GCD
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
CR-0904830820 4/1/2010 Contract report Application of PEST to Re-Calibrate the Groundwater Availability Model for the Edwards-Trinity (Plateau) and Pecos Valley Aquifers
GR10-043_MAG_Rev1 11/12/2012 GAM run - MAG Modeled available groundwater for the Edwards-Trinity (Plateau), Pecos Valley, and Trinity aquifers in Groundwater Management Area 7
GT13-026_TERS 9/19/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 2
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
GT13-028_TERS 1/15/2014 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 4
GR14-010_MP 3/26/2014 GAM run - Management Plan Management Plan data for Middle Pecos GCD
GR17-022_MP 3/28/2017 GAM run - Management Plan Management plan information for Crockett County GCD
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