Texas Commission on Environmental Quality (TCEQ)
http://www.tceq.org/

U.S. Environmental Protection Agency (EPA)
http://www.epa.gov/

U.S. Army Corps of Engineers
http://www.usace.army.mil/

Air and Waste Management Association (A&WMA)
http://www.awma.org/

American Association of Petroleum Geologists (AAPG)
http://www.aapg.org/

National Groundwater Association (NGWA)
http://www.ngwa.org/

Texas Board of Professional Geoscientists (TBPG)
http://www.tbpg.state.tx.us/