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District Mission

The Post Oak Savannah Groundwater Conservation District (POSGCD) mission is to adopt and enforce Rules consistent with State law and based on best available science, which provide for the conservation, preservation, protection, recharging, and prevention of waste of groundwater, while supporting the ownership of groundwater and the owner’s right to assign or produce that property.


The POSGCD was created in Milam and Burleson counties by HB 1784, 77th Legislature in 2001, and a local confirmation election in November 2002. The purpose of this bill is to provide a locally controlled groundwater district to conserve and preserve groundwater, protect groundwater users, protect and recharge groundwater, prevent pollution or waste of groundwater in the central Carrizo-Wilcox area, control subsidence caused by the withdrawal of water from the groundwater reservoirs in that area, and regulate the transport of water out of the boundaries of the districts. The POSGCD has 10 directors, 5 from each county. It does not have the power to tax and receives all of its revenue from fees imposed on municipal/commercial pumpers and transporters of groundwater. Successful confirmation elections were held in November 2002 in both counties in accordance with Sections 36.017, 36.018, and 36.019, Water Code, and Section 41.001, Election Code.

The POSGCD is a member of the Groundwater Management Area 12 (GMA 12) and Groundwater Management Area 8 (GMA 8), whose areal extents are shown in Figure 1. To help establish desired future conditions for the relevant aquifers within the boundaries of GMA 12 and GMA 8, POSGCD will consider groundwater availability models and other data or information. As part of the joint planning process, POSGCD will establish management goals and objectives that are consistent with the desired future conditions adopted by GMA 8 and GMA 12.

The POSGCD has within its boundaries formations of the Carrizo-Wilcox, Trinity, Queen City, Sparta, and Brazos River Alluvium aquifers. Following is an approximate description of the aquifers and their location within the District. Each description will also include an estimate of Projected Water Availability in acre-feet per year according to Table 4 of the 2002 State Water Planning Database.

The District is divided into groundwater management zones for the purposes of identifying the different characteristics and necessary management practices for each of the groundwater sources located there.

Trinity Management Zone

This zone includes that part of the Trinity aquifer located in the northwest part of the District.

Brazos Alluvium Management Zone

This zone is located along the eastern boundaries of the District and is limited to the water-bearing alluvial sediments of the Brazos River.

Queen City and Sparta/Jackson Management Zone

This zone includes all of the water-bearing outcrop and down-dip formations of the Queen City and Sparta/Jackson aquifers which are found in the District.

Carrizo-Wilcox/Simsboro Shallow Management Zone

This zone includes all of the water-bearing formations of the outcrop and down-dip of the Carrizo-Wilcox and Simsboro aquifers including, and north and west of, the Milano Fault Zone.

Carrizo-Wilcox/Simsboro Deep Management Zone

This zone includes all of the water-bearing formations of the outcrop and down-dip of the Carrizo-Wilcox and Simsboro aquifers located south and east of the Milano Fault Zone.

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