Authors: Elizabeth Denly & Mike Ursin | janvier 16, 2026

PFAS contamination is quietly reshaping property transactions, regulatory reviews and long-term environmental liability. As federal and state requirements continue to shift, many organizations are operating with partial information, inconsistent standards and gaps in historical records, often without realizing where their true exposure lies. In many cases, PFAS risk surfaces only when a deal is already underway or a cleanup is in motion, leaving little time and fewer options to respond. 

Conventional environmental due diligence was not designed for contaminants that persist, migrate and evolve under changing regulations. What’s missing is a clear, defensible way to connect site history, regional data and regulatory obligations before uncertainty turns into liability. 

This white paper presents a structured PFAS risk and liability assessment framework that brings clarity to this challenge helping organizations understand where risk may exist, how it could evolve and what actions matter most. 

Inside, you’ll discover how a structured PFAS assessment helps organizations: 

  • Uncover potential PFAS exposure even when records are incomplete 
  • Anticipate how regulatory changes may impact liability, permits and compliance 
  • Prioritize sites and portfolios before issues escalate 
  • Align environmental, legal and operational teams around shared risk visibility 
  • Reduce late-stage surprises during transactions, redevelopment and regulatory review 

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Explore a structured approach to assessing PFAS risk and liability and preparing for evolving regulatory requirements. 

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Elizabeth Denly

Elizabeth Denly serves as TRC’s Vice President, PFAS Initiative Leader and Chemistry Director. She is a chemist with over 30 years of consulting experience encompassing field and laboratory analyses and audits, QA/QC, data validation, and consulting for regulatory agencies. Ms. Denly leads the TRC Center of Research & Expertise (CORE) PFAS Team, a group of scientists devoted to staying informed of current PFAS issues, science, and regulations. As a project quality assurance (QA) chemist at TRC, Ms. Denly is responsible for providing QA/quality control (QC) oversight in support of different environmental investigations, including remediation programs, ambient air monitoring, and human health/ecological risk assessments. Ms. Denly has provided this oversight under different regulatory programs, including state and federal regulatory agencies. She currently works on many different types of PFAS investigations with a specific focus on chemistry, sampling procedures, data interpretation, forensics, QA/QC, and analytical methodologies. Ms. Denly was recently elected to serve on Interstate Technology and Regulatory Council (ITRC) Board of Advisors. She is an active leader on the ITRC PFAS team, co-leading the sub-team on Naming Conventions and History & Use, and also serving as a presenter for ITRC PFAS training workshops. Ms. Denly won the 2017 and 2022 ITRC PFAS Team Member of the Year Awards for her contributions to the ITRC PFAS team. Read more on Ms. Denly's bio page. Please contact her at edenly@trccompanies.com.

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Mike Ursin

Mike Ursin, PG, is a Senior Project Manager and Office Practice Leader with over 17 years of environmental consulting experience focused on the assessment, investigation, and redevelopment of contaminated properties throughout the Midwest and across the United States. He works with clients across both government and private sectors to navigate environmental liabilities during real estate transactions. Mike’s experience in due diligence paired with his technical expertise in the evaluation and investigation of PFAS sources and uses, provides clients with an “eyes wide open” perspective of potential PFAS liabilities. Contact Mike at mursin@trccompanies.com