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Haynes and Boone, LLP

Mary S. Mendoza

Mary S. Mendoza

Haynes and Boone, LLP
Texas, U.S.A.

tel: +1 214 651 5000
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Local Time: Tue. 06:36

Mary Mendoza concentrates her practice in the areas of environmental and administrative law. She represents clients in regulatory compliance matters, hazardous and solid waste cleanups, contested case hearings, enforcement matters, appeals of agency decisions, and toxic tort litigation. Mary counsels clients on general issues of regulatory compliance as well as on environmental issues associated with real estate, corporate and other transactions.

Mary serves as the Administrative Partner for the firm's Austin office.

Selected Client Representations:

National oil company in a multimedia environmental audit of refinery/chemical production facility.

Major retailer in the environmental issues associated with the acquisition and development of store locations.

A manufacturer of water treatment equipment in a four week jury trial regarding alleged design defects.

Regulated industries in permit proceeding before the Texas Commission on Environmental Quality.

Defendants in enforcement hearings before the Texas Commission on Environmental Quality and the Environmental Protection Agency.

Defendant in enforcement action relating to alleged Clean Air Act violations arising out of release from commerical refrigeration system.

Defendants in negotiations of RCRA and CERCLA cleanup orders with the Environmental Protection Agency.

Multiple companies in the settlement of CERCLA liabilities with the Environmental Protection Agency.

A multi state corporation in multimedia compliance audits of plant operations.

Major property management companies in the defense of mold lawsuits and in the development of mold policies.

An alternative fuels plant in connection with permitting before the TCEQ.

A seller in a divestiture involving multi state property transfer notifications.

A corporation regarding compliance counseling and divestiture of a water and wastewater supply corporation.

Entities in appeals of agency orders.

A major corporation in a multi-million dollar remediation of a contaminated site under the state voluntary cleanup program.

Multiple defendants in toxic tort litigation regarding a commercial waste disposal facility.

Manufacturers in negotiations with the Consumer Product Safety Commission relating to product recalls.

Entities in a contested case hearing related to horse race track licensing before the Texas Racing Commission.


J.D., University of Texas at Austin School of Law, 1994, with honors, Order of the Coif
B.S., Civil Engineering, University of Texas, 1991, with highest honors; Tau Beta Pi
Areas of Practice
Professional Career

Significant Accomplishments

Leading Individual--Environmental Law--Chamber’s USA America’s Leading Lawyers for Business (2006)

Who’s Who Legal: Texas Environmental Law (2007)

Texas Super Lawyer--Rising Star--Texas Monthly (2005, 2006, 2007)

Best Lawyers in America - Environmental Law (2009)

Professional Associations

Immediate Past Chair (2006-2007), Chair (2005-2006) and Executive Committee Member
(2000-2007) of the Environmental and Natural Resources Law Section of the State Bar of Texas;
American Bar Association, Section of Environment, Energy and Resources--Toxic Torts and Environmental Litigation Committee Membership Vice-Chair and State and Regional Environmental Cooperation Committee Program Vice Chair.


Hurricane Harvey: TCEQ Guidance for Hurricane Harvey
Haynes and Boone, LLP, August 2017

By August 23, 2017 Proclamation, the Governor of the State of Texas declared that Tropical Depression (now Hurricane) Harvey poses a threat of imminent disaster in 30 counties in and around the Texas coast beginning August 23, 2017. In response, the Executive Director of the Texas Commission on Environmental Quality (TCEQ), in a press release, directed regulated entities to its guidance at https://www.tceq.texas.gov/response/hurricanes...

Additional Articles

"The Carbon Revolution: Answering the Call," with J. Civins, Texas Bar Journal (April 2009)

"Companies Should Be Cautious When Making Green Claims," with J. Civins, Executive Legal Advisor (March/April 2009)

"Climate Change Disclosures - Avoid the Heat," with J. Civins, Texas Lawyer, February 2009.

"The Opportunities and Risks of the New Federal Stimulus Bill - Environmental Aspects," February 19, 2009, presentation.

"The Carbon Revolution," with J. Civins, UT CLE 2009 Carbon and Climate Change Conference, Austin, Texas, February 3-4, 2009.

"When It Comes to Eco-Marketing, It's Not Easy Being Green," with J. Civins, Austin Business Journal, November 21, 2008.

"Environmental Aspects of Corporate Transactions - Key Concepts," presented to Association of Corporate Counsel, Houston Chapter, September 25, 2007.

"Transactional Environmental Due Diligence - What Diligence is Due?" American Bar Association Natural Resources & Environment, Winter 2006.

"All Appropriate Inquiry ("AAI") Limitations and Concerns," AWMA Program, New Orleans, Louisiana, June 21, 2006.

"Reporting Environmental Liabilities and Risks After Sarbanes-Oxley" UT-Dallas Institute for Excellence In Corporate Governance, May 4, 2006.

"All Appropriate Inquiries - Are They Appropriate?" The Bureau of National Affairs, Inc., The Bureau of National Affairs, Inc., January 1, 2006.

"The Great Evolution of Environmental Law," @ Law, Spring 2003.

"Texas' Use of Institutional Controls," for the American Bar Association's book, A Practical Guide to Implementing Institutional Controls at Brownfields and Other Contaminated Sites, August 2002.

Case Law Survey, 12th Annual Water Law Conference, CLE International, October 28-29, 2002.

"Environmental Case Law Update," 13th Annual Texas Environmental Law Superconference, August 2001.

WSG's members are independent firms and are not affiliated in the joint practice of professional services. Each member exercises its own individual judgments on all client matters.

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