Tami McMullin, PhD

Dr. Tami McMullin is a toxicologist and risk assessor with over twenty years of multidisciplinary experience applying risk-based frameworks to support regulatory and legislative policies involving chemical risk management, product stewardship, and public health protection. Her career spans state government, the chemical industry, academia, and consulting, providing her with a unique breadth of expertise to deliver technical guidance on public health issues. She formerly served as the State Toxicologist for Colorado, where she led teams to evaluate health risks related to chemical exposures for a variety of issues, including Superfund waste sites, brownfields, and oil and gas exploration and development. Dr. McMullin has first-hand experience designing and overseeing environmental and air toxics field studies, and interpreting resulting data for regulatory, public health, and litigation purposes. She has served as a testifying and consulting expert in regulatory hearings and toxic tort proceedings involving air toxics and other environmental exposures. Her work focuses on exposure and risk evaluation, general causation analysis, and risk communication to non-scientific decision makers.

Smelter Superfund Site, Colorado: Supported evaluation of residential exposure pathways associated with legacy smelting operations, including interpretation of indoor dust, exterior soil, and driveway slag data to inform public health assessments and coordination with Environmental Protection Agency (EPA) sitewide cleanup actions initiated in 2018.

Air Force Base, Colorado: Evaluated PFAS exposure pathways in drinking water and locally grown produce to support the development of health advisory levels and public health decision-making.

Oil and Gas Upstream Operations (Multiple States):

• Designed and conducted air monitoring studies and human health risk assessments to characterize potential community exposures and health risks.
• Led a state-funded program to evaluate the scientific literature on public health risks associated with oil and gas development and to conduct exposure investigations in response to citizen and local government health concerns; produced a state-of-the-science report that informed policymakers, the state oil and gas commission, and the state health department on setback-distance decision-making.
• Prepared expert reports and provided testimony in rulemakings, permit hearings, and litigation, including interpretation of historical monitoring, emissions, and exposure information to support human health impact evaluations.

Oil and Gas Refineries and Terminals (Multiple US Locations): Provided ongoing toxicology, human health risk assessment, and risk communication support focused on the human health implications of air toxics and water quality issues, for public health and regulatory decision-making.

Nuclear Waste Facility, Washington: Provided long-term toxicological and risk communication support to address chemical vapor exposures to workers.

Ethylene Oxide Sterilization Facilities (Multiple US Locations): Advised on regulatory risk assessment for air toxics, exposure characterization, general causation analysis, and dose reconstruction for legal and regulatory cases.

• Colorado Energy and Carbon Management Commission (Denver, CO) – SB 19-181 Mission Change & Cumulative Impacts Rulemaking (Docket Nos. 200300071 & 240600145), 2020 & 2024.

• Colorado Energy and Carbon Management Commission (Denver, CO) – Contested Hearing: Civitas Resources (oil & gas development case), 2021.

• Colorado Air Quality Control Commission (Denver, CO) – HB 21-1266 “Environmental Justice Act” Rulemaking, 2023.

• Albuquerque–Bernalillo County Air Quality Board (Albuquerque, NM) – Cumulative Impacts Petition Rulemaking Hearing (addressing disproportionate air pollution impacts), 2023.

• Colorado Air Quality Control Commission (Denver, CO) — HB 22 1244 Toxic Air Contaminants, Regulation 30: Priority Toxic Air Contaminants identification and Health based benchmarks for PTACs, 2025.

• Eve Isaacks, Victoria Anderson, et al. v Terumo BCT Sterilization Services, Inc. District Court, County of Jefferson, State of Colorado. Case No. 2022CV031124. Trial Testimony March 6-7, 2025.

• Aera Energy, LLC and Chevron U.S.A. Inc. v. Gavin Newsom et al. Superior Court, County of Kern, State of California. Case Nos. BCV-22-100748 and BCV-22-100636. Trial Testimony January 29, 2026.

• Ann Jordan, Bruce Howard Brown, David Gutierrez, et al. v Terumo BCT Sterilization Services, Inc. District Court, County of Jefferson, State of Colorado. Case No. 2020cv31457. Trial Testimony February 12, 2026.

• Bamber, A., Hasanali S.H., Nair, A.S., Watkins, S.M., Vigil, D.I., Van Dyke, M., McMullin, T.S., Richardson, K. (2019). A systematic review of the epidemiologic literature assessing health outcomes in populations living near oil and natural gas operations: study quality and future recommendations. Int J Environ Res Public Health. 2019 Jun 15;16(12). pii: E2123.

• McMullin, T.S., Bamber, A., Vigil, D., Bon, D., and Vandyke, M. (2018). Exposures and health risks from volatile organic compounds in communities located near oil and gas exploration and production activities in Colorado. International Journal of Environmental Science and Public Health, Jul 16, 15(7).

• McMullin, T.S., Yang, Y., Campbell, J., Clewell, H.J., Plotzke, K.P., and Andersen, M.E. (2016). Development of an integrated multi- species and multi-dose route PBPK model for volatile methyl siloxanes - D4 and D5. Regulatory Toxicology and Pharmacology, 74 Suppl: S1- S13.

• Wolf, D.C., Bachman, A., Barrett, G., Bellin, C., Goodman, J., Jensen, E., McMullin, T.S., Pastoor, T.P., Schoeny, R., Slezak, B., Wend, K., and Embry, M.R. (2016). Illustrative case using the RISK21 roadmap and matrix: prioritization for evaluation of chemicals found in drinking water. Critical Reviews in Toxicology, 46(1), 43-53.

• Simon, T.W., Simons, S.S. Jr, Preston, R.J., Boobis, A.R., Cohen, S.M., Doerrer, N.G., Fenner- Crisp, P.A., McMullin, T.S., McQueen, C.A., and Rowlands, J.C. (2014). The use of mode of action information in risk assessment: quantitative key events/ dose- response framework for modeling the dose-response for key events. Critical Reviews in Toxicology, 44 Suppl 3, 17-43.