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Catherine Regan

Haley & Aldrich, Massachusetts

  • Environmental Engineer

  • M.Sc. in Fluid Mechanics and Hydrology, Stanford University

  • Vapor Intrusion Scientist and Expert

  • LinkedIn

About Catherine Regan

Catherine has over 20 years of professional experience focusing on complex site investigation and remediation projects. Her experience includes management of multi-site remediation portfolios, design and execution of thermal remediation systems, air sparge and soil vapor extraction systems, construction and excavation management, and in-situ chemical oxidation and bioremediation implementation.


Catherine is a subject matter expert for the assessment and management of residential, commercial, and industrial vapor intrusion (VI) investigations. She is responsible for facilitating collaboration and disseminating technology updates, conducting client workshops, and providing VI expertise across portfolios of projects. Regan was a section co-leader for creating petroleum VI guidance for the Interstate Technology and Regulatory Council (ITRC) and participated as a trainer for ITRC’s classroom training offerings. Currently, she serves as a section co-leader and internet-based trainer for ITRC’s next VI guidance on VI mitigation technologies.

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