Maria has practiced in the areas of Natural Resources, Environmental and Utility law for over twenty years. Her primary focus is on water resources, water quality, and related regulatory matters including National Environmental Policy Act (“NEPA”) and Endangered Species Act (“ESA”) compliance. She represents clients from both the public and private sectors before the Office of the New Mexico State Engineer, the New Mexico Public Regulation Commission federal agencies, and in state and federal court. Maria’s experience has been centered on resolution of complex disputes regarding water use and allocation. Her experience includes negotiation of multi-party water agreements, permitting of water and energy projects, the purchase and lease of water rights, water utility matters, litigation involving protection and acquisition of water resources, water planning and water quality issues.
Chambers USA has recognized Maria in the area of Water Law, and reported in 2017, “[she] has significant experience both on the regulatory and on the litigation side and clients consider her ‘very good in some critical and complex water rights claims.’”Maria was selected as 2016 “Lawyer of the Year in Water Law – Albuquerque” by Best Lawyers of America® and has also been recognized by Benchmark Litigation and Southwest Super Lawyers®.
Maria regularly addresses a complexity of issues relating to water supply and related regulatory matters regarding the permitting and siting of energy and water projects. Maria currently represents the State of Oklahoma with regard to conflicts over water resources as between the State and several Oklahoma Indian Tribes. She represented the City of Albuquerque (now the Albuquerque Bernalillo County Water Utility (“ABCWUA”) ) in protection of its municipal water supply with regard to ESA claims involving the endangered Rio Grande Silvery Minnow. She continues to represent the ABCWUA on ESA and water quality matters. She represents the Pueblo de Pojoaque in the context of the Aamodt general stream adjudication, which involves the water rights claims of four Pueblos, various governmental entities and thousands of non-Indian defendants. She participated in the decade-long effort to draft a settlement agreement which received congressional approval and funding and was signed into law by President Obama as the Claims Resolution Act in December 2010. She continues to work with the Pueblo on implementation of the settlement including approval of the Partial Final Decree for the Pueblo rights.
Prior to joining the firm, Maria served as law clerk to the Honorable James A. Parker of the United States District Court for the District of New Mexico.
Maria serves as Head of the firm’s Natural Resources and Environment Department and was long time Chair of the Water Resources Group and former Chair of the Energy & Utilities Group.
Maria is an avid runner and hiker. When not lawyering or running, she spends time with her two children, husband of 27 years and three Rhodesian Ridgebacks.
University of New Mexico School of Law, J.D., 1991, magna cum laude
University of Rhode Island, M.S. Thesis in Botany, 1988, magna cum laude
Connecticut College, B.A. in Human Ecology, 1984, cum laude
U.S. Court of Appeals for the Tenth Circuit
U.S. District Court for the District of New Mexico
United States Supreme Court
- Representation of the State of Oklahoma with regard to litigation and negotiations relating to the water claims of the Choctaw Nation of Oklahoma and the Chickasaw Nation to water in twenty-two counties in Oklahoma.
- Representation of El Paso County Water Improvement District No. 1, the Texas and downstream irrigation district in the Rio Grande Project, including in the context of ongoing interstate litigation Texas vs. New Mexico, No. 141, Orig.
- Representation of the Pueblo of Pojoaque in the settlement of Indian claims in the longest running federal court case in the country. A settlement agreement was enacted into law when it was signed by President Obama on December 8, 2010 as the Claims Resolution Act of 2010. Continued representation of the Pueblo on implementation of the settlement related to water and environmental matters.
- Ongoing and long-term representation of several municipalities and regulated water suppliers including the City of Carlsbad, City of Rio Rancho, and New Mexico Water Service Company with regard to water planning, acquisition and negotiated and litigated water supply matters.
- Assisted numerous energy projects with water and siting related matters as well as continuing to advise BHP New Mexico Coal Company on all of its water matters related to its coal mining operations in the San Juan River Basin.
- State of Oklahoma
- BHP New Mexico Coal Company
- City of Carlsbad
- City of Rio Rancho
- New Mexico Water Service Company
- Don’t Let the Well Run Dry: Management and Use of Water in Times of Scarcity, 61st Annual Rocky Mountain Mineral Law Institute, Anchorage, Alaska, July 17, 2015
- Water and Renewable Energy Generation in the Western United States: An Overview of Current Challenges and Opportunities, Rocky Mountain Mineral Law Foundation Special Institute on the Water-Energy Nexus, Denver, Colorado, September 14, 2012, Maria O’Brien and Christina C. Sheehan
- The Rio Grande Project: Federal & Interstate Obligations, Law of the Rio Grande CLE, Santa Fe, NM, March 30, 2012
- Hydrologic First Principles: The Interface Between the Technical and Legal in Water Resource Regulation, 57th Annual Rocky Mountain Mineral Law Institute, Santa Fe, NM, July 23, 2011, Maria O’Brien and Cynthia Ardito, Vice President and Senior Hydrologist, Intera
- Endangered Species Act and its Application to Energy Project Development, Law Seminars International, Eighth Annual Conference on Energy in the Southwest, July 11-12, 2011, Santa Fe, NM, Maria O’Brien and Deana M. Bennett
- Overview of New Mexico Indian Water Rights Settlements, CLE International, Santa Fe, NM, June 17, 2011
- Testimony before Senate Indian Affairs Committee on behalf of Western States Water Council, March 15, 2012, oversight hearing on Indian Water Rights; promoting the negotiation and implementation of water settlements in Indian Country.
- Benchmark Litigation, The Definitive Guide to America’s Leading Litigation Firms and Attorneys, Future Litigation Star in New Mexico, 2013-present
- Best Lawyers Lawyer of the Year in Water Law – Albuquerque, 2013
- Best Lawyers Lawyer of the Year in Water Law- Albuquerque, 2016
- Best Lawyers in America® in Water Law, 2007-present
- Chambers USA Directories of America’s Leading Lawyers for Business and Environment in Natural Resources & Regulated Industries: Water Law, 2006-present
- Martindale-Hubbell BV® Distinguished Peer Review Rated
- Southwest Super Lawyers® (derived from a lawyer survey)