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Eagle Ford Shale Geological Area

The Eagle Ford Shale is a hydrocarbon-producing geological formation extending over 26 counties. It stretches from the Mexican border between Laredo and Eagle Pass up through counties east of Temple and Waco.


The TCEQ’s primary role in the oil and gas fields is regulating emissions and ensuring air quality. Working with the Railroad Commission, which has primary jurisdiction over oil and gas facilities in Texas, the TCEQ is devoting significant resources to make sure those responsibilities are met. Based on lessons learned from the TCEQ’s work in the Barnett Shale area, numerous activities have already been conducted or will soon take place to help the agency remain in front of any environmental issues in the Eagle Ford Shale area.

The TCEQ continues to use innovative approaches to find ‘real world solutions’ that actually reduce emissions. The TCEQ has undertaken numerous projects that use state-of-the-science technology to assess and address emissions from oil and gas activities. These initiatives have resulted in emissions reductions through improved agency policies, guidance for regulated entities and possible enforcement if necessary.

Map of Eagle Ford Shale area

Latest Activities

Eagle Ford Shale Mobile Monitoring Study

Natural Resource article on Air Quality in Eagle Ford Shale Area

Eagle Ford Map

The following map shows oil and gas wells for the Eagle Ford Shale area.

Map of Wells in Eagle Ford Shale

Map provided by the Texas Railroad Commission.

Air Monitoring

Floresville Automated Gas Chromatographs (AutoGCs)

Near-real-time air monitoring results from the agency's AutoGC monitor in the Eagle Ford Shale area:

Sampling Results and Health Effects Evaluations by County

TCEQ laboratory analysis, listed by county, of air sampling conducted near oil and/or natural gas facilites in the Eagle Ford Shale area. Health effects evaluations for air sampling results are posted as they become available.

24-Hour Canister Monitoring

The Texas Air Monitoring Information System (TAMIS)
TAMIS is a TCEQ Web interface that can generate a report showing VOC data collection at the 24-hour Laredo Bridge canister in Webb County.

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