Editor's Note: This article was updated March 23, 2026 to include a quote from Arcadis about Barnard's influence on the wastewater community.
Dr. James L. Barnard, a globally influential figure in wastewater treatment and widely regarded as the “father of biological nutrient removal,” has died at age 90, according to reporting by The New York Times.
Barnard, who died Jan. 27, 2026, helped transform how utilities remove nitrogen and phosphorus from wastewater—advancing biological treatment processes that are now used at facilities worldwide to reduce nutrient pollution and protect receiving waters.
Over a career spanning decades, Barnard developed and refined several foundational nutrient removal processes, including the Bardenpho system, which enabled more effective control of eutrophication and algal blooms. His work played a critical role in shifting the industry toward more sustainable, biologically driven treatment approaches.
Barnard was also a longtime industry leader and mentor, contributing to the design and implementation of nutrient removal systems across the globe and authoring dozens of technical publications. He was elected to the National Academy of Engineering in 2021 in recognition of his contributions to water treatment innovation.
Barnard joined engineering firm Black & Veatch in 1998 where he was Global Practice and Technology Leader.
“At Black & Veatch, we mourn the loss not only of an incredible scholar and industry expert but also the loss of a friend,” said Donnie Ginn, executive vice president and water solutions portfolio leader for Black & Veatch, in a news release. “His ability to devote care and attention to those around him has never gone unnoticed, and we as a company are grateful to have worked with him in the last 27 years of his notable career.”
Mehran Andalib, vice president and wastewater national practice leader for Arcadis, also reflected on the impact of Barnard's work on the wider wastewater community, noting Barnard's contributions to biological phosphorus removal "fundamentally shaped the field."
"His work played a key role in advancing EBPR into a reliable and widely implemented technology, influencing decades of design and operational practice," Andalib said. "Equally significant was his commitment to the profession and the people within it, as he consistently shared his knowledge and experience with others. His legacy endures in both the evolution of EBPR and the many professionals inspired by his work."
Barnard's legacy continues to shape modern wastewater treatment as utilities face increasing pressure to meet stricter nutrient limits and protect water quality.
About the Author
Alex Cossin
Associate Editor
Alex Cossin is lead reporter, staff writer and content strategist for Waterworld Magazine, Wastewater Digest, Stormwater Solutions and Water Technology. Cossin graduated from Kent State University in 2018 with a Bachelor of Science in Journalism. Cossin can be reached at [email protected].