Researching Groundwater Protection Determinations and Data

This webpage provides an overview of resources for researching groundwater and related data. These resources are used by the Groundwater Advisory Unit (GAU) of the Railroad Commission of Texas (RRC).

Researching Groundwater Protection Determinations

  • June 6, 2015 to Current

    RRC Online System - Groundwater Application (GW-1) Database

    The RRC Online System is the RRC’s online filing application system and database. Select the Groundwater (GW-1) Application in the “Menu Main” in the RRC Online System.  The side menu includes a Search called “All Applications,” which will take you to a search form with parameters that can be used to find Forms GW-1, Groundwater Protection Determination Request Form, and GW-2, Groundwater Protection Determination.

    For instructions on how to gain access to the RRC Online System (e.g. Groundwater (GW-1) Application or Drilling Permits W-1 Application), visit the RRC Online System Login Page under "How to Obtain a User ID."

  • Fall 2008 to June 6, 2015

    Groundwater Protection Determination Letters Database 

    You can research groundwater protection determinations in Neubus.
  • 2001 to 2009

    State Archives Groundwater Protection Determinations

    The RRC’s GAU is in the process of adding groundwater protection determinations from 2001 to 2009 to the Groundwater Protection Determination Letters Database. To request a determination from this period not available online, email the GAU at

  • 1956 to 2000

    Micro-Filmed Groundwater Protection Determinations 

    To obtain hardcopies of groundwater determinations, contact the RRC's Central Records in Austin.

Researching Groundwater Data

You can research RRC oil and gas records that may include groundwater data using the following Oil and Gas Imaged Records in Neubus.

  • Geophysical Well Logs

    Much of what we know about deep groundwater resources comes from geophysical well logs provided by oil and gas exploration companies. The following are sources for well logs available at the RRC.

    • Oil and Gas Well Logs

      The RRC’s online database of well logs that can be accessed by keyword searches (e.g. API number, lease name, county).

    • RRC Public GIS Viewer

      Any well for which the RRC has a log in our online database can be highlighted by clicking the checkbox in the “Visibility” menu. You can then access a link to the well log by clicking on the well spot using the “Identify Wells” tool.

    • GAU Well Log Library

      The RRC’s GAU maintains a geophysical well log library that includes logs that may not be available in our online databases. To obtain hardcopies of these logs, contact the RRC's Central Records in Austin. Some of these logs may also be available in electronic format (e.g. TIFF, PDF).

  • Injection Disposal Permits

Researching Groundwater Data Outside RRC

Texas Water Development Board (TWDB)

University of Texas – Bureau of Economic Geology (BEG)

  • Surface Casing Estimator - Contains estimates of well casing depths in Texas. (The information provided by the Surface Casing Estimator does not replace the need for a GAU groundwater protection determination.)
  • Geophyiscal Log FacilityAn estimated 1.5 million logs are archived at the Geophysical Log Facility, and include the RRC collection, donated logs from industry, and logs from BEG research projects. Other datasets available at the Geophysical Log Facility include Well Records, Driller’s Logs, Strip Logs, Mud Logs, Core Analysis, and Scout Tickets from thousands of Texas wells.

Last Updated: 3/5/2018 4:47:28 PM