Nacatoch Aquiferinteractive map | cross-section

Summary

The Nacatoch Aquifer is a minor aquifer occurring in a narrow band across northeast Texas. The aquifer consists of the Nacatoch Sand, composed of sequences of sandstone separated by impermeable layers of mudstone or clay. These sandstones are marine in origin, coarsen upward, and are laterally discontinuous. The number of sand layers varies throughout the Nacatoch's extent, and the thickness of individual sand units ranges from more than 100 feet in the north to less than 20 feet to the south. Thickness of intervening mudstone units similarly ranges from more than 100 feet to only a few feet. Freshwater saturated thickness averages about 50 feet. The aquifer also includes a hydraulically connected cover of alluvium that is as much as 80 feet thick along major drainages. Groundwater in this aquifer is usually under artesian conditions except in shallow wells where the Nacatoch Formation crops out and water table conditions exist. The Mexia-Talco Fault Zone generally delineates the subsurface limit of the aquifer.

The groundwater in the aquifer is typically alkaline, high in sodium bicarbonate, and soft. Total dissolved solids in the subsurface increase and are significantly higher south of the Mexia-Talco Fault Zone, where the water contains between 1,000 and 3,000 milligrams per liter of total dissolved solids.

Water from the aquifer is extensively used for domestic and livestock purposes. The city of Commerce historically pumped the greatest amount from the Nacatoch Aquifer but has recently attempted to convert to surface water; however, because of recent droughts, the city has pumped 30 to 50 percent of its water from the aquifer. As a result of Commerce's reduced pumping, the declining water levels that had developed around Commerce in Delta and Hunt counties are stabilizing.

Reports

ID Date Type Description
GMA8_DFC_01 12/17/2007 DFC submission Desired future conditions for the Blossom, Brazos River Alluvium, Edwards (Balcones Fault Zone), Nacatoch, and Woodbine aquifers
R-160 11/1/1972 TWDB numbered report Ground-Water Resources of Navarro County, Texas
R-269 4/1/1982 TWDB numbered report Occurrence, Availability and Chemical Quality of Ground Water in the Cretaceous Aquifers of North-Central Texas, Volumes 1 & 2
R-305 4/1/1988 TWDB numbered report Ground-Water Resources of the Nacatoch Aquifer
R-349 11/1/1999 TWDB numbered report Updated Evaluation of Water Resources in Part of North-Central Texas, 1990-1999
R-318 1/1/1990 TWDB numbered report Evaluation of Water Resources in Part of North-Central Texas
GR09-021_MP 7/31/2009 GAM run - Management Plan Management plan information for Neches & Trinity Valleys GCD
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
GMA8_DFC_06 6/23/2011 DFC submission Desired future conditions for the Brazos River Alluvium, Nacatoch, and Woodbine aquifers
GR11-011_MAG 12/14/2011 GAM run - MAG Modeled available groundwater estimates for the Nacatoch Aquifer in Groundwater Management Area 8
GR10-006 7/30/2012 GAM run Predictive simulations for the Nacatoch Aquifer in Groundwater Management Area 8
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
CR-1004831114 8/9/2012 Contract report Ground Water Recharge Model: Calibration and Validation for Remotely-Sensed Dual Coefficient (RDC) GMA8 ET Estimation
GMA8_DFC_04 3/16/2009 DFC submission Desired future conditions for the Blossom and Nacatoch aquifers
GR13-013_MP 7/3/2013 GAM run - Management Plan Management plan data for Neches & Trinity Valleys GCD
GT13-031_TERS 1/15/2014 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 8
GT13-034_TERS 4/2/2014 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 11
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