Lydia Dorrance, Ph.D.

Lydia Dorrance is an Environmental Scientist based in California with more than 10 years of experience focused on geochemistry, environmental forensics, and litigation support.

Lydia Dorrance is an Environmental Scientist based in California with more than 10 years of experience focused on geochemistry, environmental forensics, and litigation support.


Lydia's consulting experience and training in the fields of environmental chemistry and oceanography is an asset in helping her clients implement site investigations, manage large environmental datasets, coordinate projects, and provide technical support and expert services to counsel. She has served as an expert witness in case before a Special Master appointed by the United States Supreme Court.

Investigating methods to forensically identify sources of per- and polyfluoroalkyl substances (PFAS) contamination to the environment has been a key focus for Lydia. Her investigation includes identifying means of differentiating between individual formulations of aqueous film forming foam (AFFF), of which PFAS comprise key active ingredients.

Clients additionally rely on her expertise in geochemical analyses and environmental forensic techniques to address sediment, soil, groundwater, soil vapor, and surface water contamination at large Superfund sites and smaller properties impacted by a variety of contaminants including metals and polycyclic aromatic hydrocarbons (PAHs). She has supported multiple clients with environmental liabilities stemming from large-scale contaminated sediment sites (so-called sediment “mega-sites”) where forensics can play a key role in allocation of cleanup costs among responsible parties.

Lydia has presented nationwide on topics related to her practice, including recent litigation surrounding PFAS, potential forensic tools for managing PFAS liabilities, and ways to constrain the timing of environmental releases. She currently serves on the executive committee of the Environmental Chapter of the Alameda County Bar Association.

Contact Lydia Dorrance at This email address is being protected from spambots. You need JavaScript enabled to view it. or +1-510-285-2706.

Career Summary of Lydia Dorrance, Ph.D.

  • Specialties: Litigation Support; Geochemistry and Environmental Forensics; Site Investigation and Remediation
  • Practice Areas: Contaminated Site Assessment and Cleanup
  • Disciplines: Biological Sciences
  • Education: Ph.D., Oceanography, Scripps Institution of Oceanography, University of California San Diego, La Jolla, 2010; M.S., Oceanography, Scripps Institution of Oceanography, University of California San Diego, La Jolla, 2010; B.A., Environmental Chemistry, Columbia University, New York, New York, 2004

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