Thirteen Years, One Fund: The $10.3 Billion 3M PFAS Public Water System Settlement
By Paul E. Rosenfeld, M.S., Ph.D., Principal Environmental Chemist, RoseyFields LLC, Santa Monica, California
The largest environmental settlement most people have never heard of
In 2023, 3M received preliminary court approval for a $10.3 billion settlement resolving hundreds of lawsuits brought by public water providers nationwide alleging PFAS contamination of drinking water, one of the largest environmental settlements in U.S. history. Dr. Paul E. Rosenfeld, M.S., Ph.D. of RoseyFields LLC collected and analyzed the underlying exposure data supporting this litigation (RoseyFields.com, 3M case summary).
Firefighting foam as the dominant exposure pathway
The settlement primarily addresses PFAS contamination linked to aqueous film-forming foam (AFFF), historically manufactured by 3M and used extensively at military bases, airports, and industrial facilities for fighting petroleum fires, a pathway directly connected to Dr. Rosenfeld’s own long-documented research on AFFF-related PFOA and PFOS contamination in drinking water at U.S. airports (Rosenfeld, 2009).
A thirteen-year funding structure for a persistent contamination problem
Unlike a single lump-sum payment, the settlement funds PFAS testing and treatment for municipal water systems over a 13-year period, reflecting the reality that remediating PFAS contamination in a public water system is not a one-time event but an extended process of testing, treatment infrastructure installation, and ongoing monitoring.
How state objections shaped the final agreement
The settlement advanced only after revisions addressed objections from several states, while preserving states’ rights to pursue separate claims beyond the settlement fund, meaning individual states retained the ability to seek additional recovery for contamination not fully addressed by the national fund.
Why public water systems, rather than individual residents, drove this litigation
As in the DuPont, Syngenta, and Lyondell settlements, the plaintiff class here consisted primarily of public water providers seeking reimbursement for testing and treatment costs, reflecting a broader pattern in which utilities, as the entities directly responsible for delivering water meeting federal standards, bear the immediate financial burden of responding to contamination and are consequently the most efficient class of plaintiffs to bring nationwide claims.
The regulatory backdrop that quantifies the harm
EPA’s 2024 PFAS National Primary Drinking Water Regulation, setting Maximum Contaminant Levels of 4.0 parts per trillion for PFOA and PFOS, provides the specific numeric standard against which affected water systems’ testing and treatment costs, and therefore their settlement compensation, can be measured (US EPA, 2024).
Connecting manufacturing history to nationwide contamination
3M’s decades-long manufacture of PFOA, PFOS, and related AFFF formulations created a genuinely nationwide contamination footprint, since AFFF was used and released at thousands of individual military, airport, and industrial fire-training sites across the country, a geographically dispersed source pattern very different from the single-facility contamination addressed in matters like the DuPont Washington Works litigation.
Fate and transport modeling across a national footprint
Supporting litigation and settlement allocation at this scale required fate-and-transport analysis capable of characterizing PFAS migration from soil at AFFF application sites into underlying groundwater and connected public water system wellfields across hundreds of individually distinct hydrogeologic settings nationwide.
The firefighter-specific PFAS exposure pathway as a related but distinct claim
Separate from the public water system claims resolved in this settlement, firefighters who directly handled AFFF or wore PFAS-treated turnout gear face an independent occupational PFAS exposure pathway, addressed in Dr. Rosenfeld’s peer-reviewed firefighter PFAS research rather than in this drinking-water-focused settlement (Rosenfeld et al., 2023).
Why this settlement will not be the final word on PFAS liability
With additional PFAS manufacturers, additional contaminated sites, and additional claimant categories, including individual personal-injury claims, still working through the litigation system, the 3M public water system settlement represents a major but partial resolution of a contamination problem that is likely to generate litigation for years to come. RoseyFields.com includes further material on Dr. Rosenfeld’s PFAS exposure assessment work.
References
1. In re Aqueous Film-Forming Foams (AFFF) Products Liability Litigation, MDL No. 2873 (D.S.C.); 3M public water system settlement, preliminary approval 2023.
2. RoseyFields LLC. $10.3 Billion Settlement — PFAS “Forever Chemicals” Drinking Water Litigation (3M). Santa Monica, CA: RoseyFields LLC; 2026.
3. Rosenfeld PE. Perfluoroctanoic Acid (PFOA) and Perfluoroactane Sulfonate (PFOS) Contamination in Drinking Water From the Use of Aqueous Film Forming Foams (AFFF) at Airports in the United States. Ground Water Summit and Ground Water Protection Council Spring Meeting; April 19-23, 2009; Tucson, AZ.
4. US Environmental Protection Agency. PFAS National Primary Drinking Water Regulation. 40 CFR Parts 141 and 142. Fed Regist. 2024;89(81):32532-32757.
5. Rosenfeld PE, Spaeth KR, Remy LL, Byers V, Muerth SA, Hallman RC, Summers-Evans J, Barker S. Perfluoroalkyl substances exposure in firefighters: sources and implications. Environ Res. 2023;220:115164.
6. Bells RL, et al. v The 3M Company, et al. Case No. 1:16-cv-02531-RBJ (D Colo).
7. C8 Science Panel. Probable Link Reports: PFOA and Human Disease. Mid-Ohio Valley, WV/OH: C8 Science Panel; 2011-2012.
8. Agency for Toxic Substances and Disease Registry. Toxicological Profile for Perfluoroalkyls. Atlanta, GA: US Department of Health and Human Services; 2021.
9. US Environmental Protection Agency. Human Health Toxicity Assessment for Perfluorooctanoic Acid (PFOA) and Related Compounds. Washington, DC: US EPA; 2024.
10. US Environmental Protection Agency. Per- and Polyfluoroalkyl Substances (PFAS): Proposed PFOA and PFOS Compliance Extension Rule. Washington, DC: US EPA; 2026.
11. US Department of Defense. Aqueous Film-Forming Foam (AFFF) Use and PFAS Contamination at Military Installations. Washington, DC: US DoD.
12. Rosenfeld PE, Spaeth KR. Authors’ response to letter to the editor from Bullock and Ramacciotti. Water Air Soil Pollut. 2023;234:165.
13. Rosenfeld PE. RoseyFields LLC: PFAS Fate, Transport, and Exposure Assessment. Santa Monica, CA: RoseyFields LLC; 2026.
14. US Environmental Protection Agency. Revisions to the Guideline on Air Quality Models. 40 CFR Part 51, Appendix W. Fed Regist. 2017;82(10):5182-5235.