John Merrill

John Merrill is a Professional Engineer based in California focused on environmental site assessment and remediation, applied research, litigation support, and remediation of emerging contaminants.

John Merrill is a Professional Engineer based in California focused on environmental site assessment and remediation, applied research, litigation support, and remediation of emerging contaminants.


John supports clients with environmental characterization and remediation under many regulatory frameworks, including CERCLA and state-specific regulations. He has experience working with per- and polyfluoroalkyl substances (PFAS) and other emerging contaminants, such as 1,4-dioxane and 1,2,3-trichloropropane (TCP). He also works at sites impacted by chlorinated volatile organic compounds (CVOCs) and fuel oxygenates.

John manages and supports PFAS projects within the United States and internationally. He designs and executes site investigation work plans to characterize PFAS in groundwater, soil, stormwater, and leachate, and he has developed PFAS-specific procedures for a variety of sampling methods. He also supports waste management for PFAS-impacted media and litigation involving the use of aqueous film-forming foam.

Additionally, John characterizes and remediates sites impacted by CVOCs and fuel oxygenates. He has experience designing and executing in situ bioremediation, in situ chemical reduction (ISCR), in situ chemical oxidation (ISCO), soil vapor extraction, and groundwater extraction and treatment systems. John often communicates and negotiates with stakeholders, including regulators, responsible parties, and property owners, and he manages subcontractors and vendors.

To advance the state of the practice, John researches innovative technologies to remediate emerging contaminants and publishes his work. He supports the US Department of Defense and the United Kingdom Environment Agency, developing lines-of-evidence approaches to assess the effectiveness of PFAS remedial technologies. John’s thesis focused on the treatment of GenX and other per- and polyfluoroalkyl ether acids, a subclass of PFAS. John also supports the student program for the annual RemTEC and Emerging Contaminants Summit.

Contact John at This email address is being protected from spambots. You need JavaScript enabled to view it..

Career Summary of John Merrill

  • Specialties: Contaminated Site Assessment and Cleanup
  • Practice Areas: Contaminated Site Assessment and Cleanup, Environmental Management, Building Health, Water and Natural Resources, Air Quality Management and Air Pollution Control, Geotechnical and Geoenvironmental Engineering, Waste Management, Structural and Fluid Engineering, Facility Hazards, Environmental, Social, and Governance
  • Disciplines: Civil Engineering, Environmental Engineering
  • Education: BS, Environmental Engineering, North Carolina State University, 2018

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