El Paso

221 N. Kansas, Suite 1700
El Paso, TX 79901
Phone: 915.533.4424
Fax: 915.546.5360


2905 San Gabriel St, Suite 205, 
Austin, TX 78705
Phone: 512.320.5466
Fax: 512.320.5431

Las Cruces

3800 E. Lohman Ave., Suite C
Las Cruces, NM 88011
Phone: 575.527.0023
Fax: 915.546.5360

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Deborah C. Trejo

Email: deborah.trejo@kempsmith.com
Telephone: 512.320.5466 / Fax: 512.320.5431

Deborah C. Trejo is a partner in the firm's Trial Department and Public and Environmental Law Department focusing on representing governmental entities and private clients in administrative matters and in trial and appellate proceedings before state and federal courts. Ms. Trejo specializes in groundwater issues, open government, regulatory takings, endangered species, elections, water quality, constitutional issues, enforcement, permitting and litigation.

Ms. Trejo is a frequent author and speaker and has consistently been selected for inclusion by Best Lawyers in America in the area of Administrative/Regulatory and Environmental Law and was named a Top Attorney by Austin Monthly in Government and Administrative Law.

Prior to joining Kemp Smith, Ms. Trejo worked on the Texas-Mexico border as an Assistant District Attorney for Cameron County, Texas, where she was involved in extensive litigation in state courts. During law school, Ms. Trejo held clerkships in the law firm of Clifford Chance in London, the Texas Office of the Attorney General in Austin, TX, and El Centro Legal Campesino in New Mexico and served as an attorney in the Tulane Environmental Law Clinic representing clients in state trial and appellate proceedings and before state and federal administrative agencies. She was also part of a special Tulane delegation to Havana where she worked with members of Cuba’s Ministry of Science, Technology, and the Environment to translate Cuba’s Law No. 81 on the Environment.



  • Tulane University Law School, J.D., magna cum laude, Order of the Coif, Certificate in Environmental Law, Environmental Law Clinic, McCarthy Environmental Law Award for the Outstanding Student in Environmental Law, 1998
  • Southern Oregon State College, Teaching Certification, 1993
  • Reed College, B.A., 1991


  • State Bar of Texas - Environmental and Natural Resources Law Section
  • Austin Bar Association
  • Travis County Women Lawyers Association
  • Hispanic Bar Association of Austin
  • Texas Water Conservation Association Water Laws Committee
  • Austin Bar Foundation Fellow
  • Hispanic National Bar Association
  • Texas Women Lawyers


  • Texas, 1998
  • U.S. District Court, Western District of Texas
  • U.S. District Court, Northern District of Texas
  • U.S. Court of Appeals, Fifth Circuit
  • U.S. Supreme Court

Professional & Civic Involvement

Ms. Trejo is the author of several publications and a frequent speaker on environmental and water law, including a chapter on groundwater conservation districts and subsidence districts in the State Bar of Texas’ Essentials of Texas Water Resources.  

Ms. Trejo is a founder and board member of 22Q Texas, Inc. and spearheaded the effort to get the Texas Legislature to pass the first legislation in the world to increase awareness of 22q11.2 deletion (Velocardiofacial or DiGeorge) syndrome, the second most common genetic abnormality. Ms. Trejo was a member of Leadership Austin’s 2008 Essential Class. She also serves on the board of Texas Women Lawyers, on the Legacy Leadership Circle of the New Philanthropists, the Austin ISD Special Education Family Advisory Council, and was a founding member of the Coalition for Special Education Equity in Austin ISD and the Coalition for Bilingual Education Equity in Austin. She is a volunteer with the Parent Teacher Student Association of Austin High School, the Down Syndrome Association of Central Texas and the Texas Parent to Parent Network.


  • Austin Monthly Top Attorney in Government and Administrative Law 
  • Austin Young Lawyers’ Association Pro Bono Challenge Winner
  • Best Lawyers in America in Administrative/Regulatory and Environmental Law
  • Save Barton Creek Association Teamwork Award
  • Recognized City of Austin Community Volunteer during Winter Story Uri
  • BSA Capital Area Council Armadillo District Norm Hummell Award