Hazen Leads Water Research Foundation Webcast on Optimizing Corrosion Control Treatment

(RICHMOND, VA – May 7, 2026) – Multiple Hazen experts recently led a Water Research Foundation (WRF) webcast titled, “Guidance for Orthophosphate-Based Corrosion Inhibitor Treatment.” Featuring Hazen’s Roger Arnold, PE, Rusty Nigro, PE, Becki Rosenfeldt, PE, and Baljit Sidhu, along with a partnering utility leader, the webcast offers insights into implementing a specific method of optimizing corrosion control that can pose a unique set of challenges.  

Many utilities are revisiting their corrosion control strategies in anticipation of the next major compliance deadline for the Lead and Copper Rule Improvements (LCRI) from the U.S. Environmental Protection Agency (EPA). Beginning November 1, 2027, water utilities will be required to comply with a set of regulations that establish timelines for replacing lead pipes in drinking water systems, mandate rigorous drinking water testing, require communications about the health risks of lead exposure, and more.  

Optimizing corrosion control treatment is important for utilities to consider as part of achieving this compliance, as it protects public health by minimizing the release of lead and copper into drinking water from building plumbing and service lines. This webcast is rooted in Hazen-led WRF project #5119, “Using Phosphate-Based Corrosion Inhibitors and Sequestrants to Meet Multiple Water Treatment Objectives,” which is aimed at helping utilities navigate this aspect of system management and LCRI compliance.  

Published in 2025, WRF project #5119 resulted in accessible, engaging, and comprehensive guidance—in the form of an interactive two-part manual—that helps utilities explore corrosion inhibitor options and select treatments that will be the most effective in their systems.  

The Corrosion Inhibitor Evaluation Framework helps utilities identify the best inhibitors based on their treatment objectives, water quality, pipe materials, and potential unintended consequences. The Corrosion Inhibitor Treatment Decision Guidance then explores best practices for the selected product’s use and necessary treatment process changes. These are crucial tools to help utilities achieve compliance with LCRI and, most importantly, protect the health of the communities they serve.

“With the Lead and Copper Rule Improvements reshaping how utilities must approach corrosion control treatment, the timing of this guidance couldn’t be more critical,” said Arnold, who also served as Principal Investigator on the project. “WRF project #5119 provides the sector with updated, actionable guidance that helps utilities comply with evolving regulations while safeguarding public health. By taking proactive steps early, utilities can optimize treatment prior to the compliance date.”

For more information and to view the recording of the webcast, which is available to members, visit the Water Research Foundation site.