U.S. Environmental Protection Agency - United States
AUTHOR PROFILE
SUMMARY
Xin (Cissy) Ma is a leading environmental engineer at the U.S. Environmental Protection Agency with a strong record in sustainable water systems, life cycle assessment, and resource recovery. With decades of experience in federal research, Ma has played a crucial role in developing tools and strategies to inform urban water reuse, address emerging contaminants, and enhance wastewater treatment. She is widely recognized for her contributions to systems analysis, policy engagement, and interagency collaboration, significantly advancing national efforts toward a net-zero water economy and climate resilience in environmental infrastructure.
PROFESSIONAL EXPERIENCE
Serving as a senior research environmental engineer at the EPA, Xin Ma has progressed through a distinguished federal career. Her work spans technical research, strategic program leadership, and stakeholder engagement. At the EPA's Cincinnati and Athens labs, she has led numerous research initiatives focused on decentralized water reuse, nutrient recovery, and emergy accounting. She has also served as a Contracting Officer’s Representative and Principal Investigator on major projects, advancing sustainability goals across multiple EPA programs. Her extensive involvement in grant reviews, technical writing, and expert panels further reflects a comprehensive and impactful professional journey.
RESEARCH INTEREST
Ma's research focuses on sustainable urban water systems, water reuse, life cycle and cost assessment, and nutrient recovery. Her investigations aim to optimize the environmental and economic performance of water and wastewater treatment technologies. With a multidisciplinary systems approach, she explores how emerging contaminants, climate variability, and circular resource flows impact water infrastructure. A significant emphasis is placed on integrating ecological accounting metrics like emergy into life cycle thinking. Her work supports resilient infrastructure development, particularly in decentralized and fit-for-purpose water reuse strategies, promoting equity, efficiency, and sustainability in environmental decision-making.
AWARD AND HONOR
Xin Ma has received numerous accolades, including the 2025 AWWA ACE Water 2050 MVP for Net Zero Water Economy and multiple U.S. EPA Scientific and Technological Achievement Awards. Her service has been recognized with honors from the White House Office of Science and Technology Policy for contributions to IPCC reviews. A consistent recipient of superior performance awards across various EPA divisions, her recognition spans over a decade. These honors reflect the national and international impact of her technical leadership, scientific excellence, and commitment to environmental innovation and sustainable development.
RESEARCH SKILL
Ma possesses expert-level skills in life cycle assessment, cost-benefit analysis, emergy accounting, and sustainability metrics. Her capabilities include modeling water reuse systems, evaluating environmental tradeoffs, and using integrated decision-support tools. She has led interdisciplinary teams in developing EPA-endorsed software such as the NEWR Calculator and the UEV Library. Her research integrates quantitative and qualitative metrics, blending environmental science, policy, and engineering. With a solid foundation in experimental design, data interpretation, and regulatory alignment, Ma excels in translating complex data into practical solutions for federal policy and sustainable infrastructure planning.
PUBLICATIONS
Title: Environmental Impacts and Cost of a Water Quality Trading Approach for NPDES Nutrient Permit Compliance in a Rural Watershed
Authors: Sam Arden; Ben Morelli; Joe Miller; Sagarika Rath; Jennifer Ferrando; George Azevedo; Smiti Nepal; Bayou Demeke; Xin (Cissy) Ma
Journal: Water Research X, 2025
Title: Onsite Non-potable Reuse for Large Buildings: Environmental and Economic Suitability as a Function of Building Characteristics and Location
Authors: Sam Arden; Ben Morelli; Sarah Cashman; Xin (Cissy) Ma; Michael Jahne; Jay Garland
Journal: Water Research, 2021
Title: Human Health, Economic and Environmental Assessment of Onsite Non-Potable Water Reuse Systems for a Large, Mixed-Use Urban Building
Authors: Sam Arden; Ben Morelli; Mary Schoen; Sarah Cashman; Michael Jahne; Xin (Cissy) Ma; Jay Garland
Journal: Sustainability, 2020
Title: Holistic Analysis of Urban Water Systems in the Greater Cincinnati Region: (1) Life Cycle Assessment and Cost Implications
Authors: Xiaobo Xue; Sarah Cashman; Anthony Gaglione; Janet Mosley; Lori Weiss; Xin Cissy Ma; Jennifer Cashdollar; Jay Garland
Journal: Water Research X, 2019
Title: Holistic Analysis of Urban Water Systems in the Greater Cincinnati Region: (2) Resource Use Profiles by Emergy Accounting Approach
Authors: Sam Arden; Xin (Cissy) Ma; Mark Brown
Journal: Water Research X, 2019
CONCLUSION
Through a career grounded in research excellence and public service, Xin Ma exemplifies leadership in sustainable water infrastructure and environmental systems thinking. Her contributions have driven forward national priorities in climate adaptation, water reuse, and resource efficiency. By integrating science, engineering, and policy, she delivers solutions that support resilient communities and ecological health. From tool development to global collaboration on climate reports, her influence spans local, national, and international levels. Xin Ma continues to shape the future of environmental engineering through rigorous analysis, stakeholder engagement, and innovation in sustainability practices.