Public water providers across the United States are entering an important stage of the largest drinking water contamination settlements ever created. The nationwide PFAS settlements involving 3M and DuPont offer a rare opportunity for water systems to recover testing expenses, pay for treatment improvements, and offset regulatory compliance costs associated with new EPA drinking water standards.
These settlements, however, are not automatic funding programs. They operate as structured claims processes with deadlines, technical documentation requirements, and allocation formulas based on system data. As Phase Two approaches, water systems that prepare early are far more likely to preserve eligibility and secure meaningful recovery.
This guide explains how the settlements work, outlines the upcoming deadlines, discusses possible funding amounts, and describes the steps water systems should be taking now.
Overview of the 3M and DuPont Public Water Settlements
The 3M Public Water Provider Settlement is valued at roughly $10.5 to $12.5 billion depending on participation levels and payment timing. The separate DuPont settlement, which also includes Chemours and Corteva, adds approximately $1.185 billion dedicated to public water systems.
Together, these funds are intended to address PFAS drinking water impacts, including testing, treatment installation, engineering analysis, and infrastructure upgrades required by new regulatory standards. Importantly, the settlement funds are generally unrestricted and may be used as needed by qualifying systems.
Settlement allocations are calculated using objective data. Two primary variables are PFAS concentration levels and system flow rates. These measurements are used to calculate a PFAS Score and an Adjusted Flow Rate.
Another important detail is that allocations are calculated per affected water source, not just per utility. Each qualifying groundwater well or surface water intake can generate its own allocation. As a result, systems with multiple impacted sources may qualify for substantially larger recovery amounts. Even systems with low or non-detect finished water levels may still qualify because contamination can exist at the source.
Most Water Systems Are Already Included
One of the most misunderstood aspects of these settlements is that they are structured as “opt-out” class actions.
This means eligible public water systems were automatically included unless they filed a timely opt-out with the court or settlement administrator. As a result, the majority of water systems in the United States are already participants, even if they have not filed a claim.
Because of this structure, a system that did not opt out has already released certain PFAS-related claims against the settling companies. In exchange, the system has the right to seek settlement funds — but only if it follows the claims procedures and meets the deadlines.
Phase Two is therefore not a decision about whether to participate. It is about collecting funds already tied to that legal release. Systems that fail to submit testing data and documentation may lose payment eligibility even though the claims have already been released.
Municipalities and water managers should view these deadlines as financial protection deadlines rather than litigation choices.
Why Phase Two Is Important
Phase One focused largely on systems with known PFAS detections. Phase Two expands eligibility and creates additional pathways for systems that did not fully participate earlier or still need baseline testing.
Phase Two funding opportunities include:
• Testing reimbursement
• Action Fund claims
• Special Needs Fund claims
• Long-term supplemental reimbursement
Each category has separate documentation requirements and deadlines.
Some systems assume they can wait. They cannot. While many systems have already settled by taking no action, they must still file claims and supporting documentation to receive payment. Testing should be scheduled early, operational data must be verified, and expense records must be organized. Missing a deadline can permanently eliminate recovery.
(Deadlines should always be verified through the official settlement administrator.)
Phase Two Deadlines
March 31, 2026 — Testing Cost Reimbursement
Claims for eligible past PFAS testing costs must be submitted.
July 1, 2026 — Baseline Testing
Required baseline PFAS testing must be completed.
July 31, 2026 — Action Fund Claims
Primary claims deadline determining allocation eligibility.
August 1, 2026 — Special Needs Fund
Reserved for systems that incurred PFAS response expenses such as filtration or new wells.
December 31, 2030 — Supplemental Fund
Allows future reimbursement for ongoing treatment and compliance costs, provided baseline testing was completed.
Potential Settlement Amounts
Estimated settlement allocation tables provide guidance, although they are not guarantees.
For the 3M settlement, allocations per impacted source may range from several hundred thousand dollars to tens of millions depending on PFAS Score and Adjusted Flow Rate. For example, a single impacted source with a PFAS Score of 100 and an Adjusted Flow Rate of 10,000 gallons per minute corresponds to an estimated allocation exceeding $5 million. Higher flow rates and higher contamination levels may produce allocations over $20 million per source. Even low-level detections of 1–2 PPT may still qualify for significant funding.
The DuPont settlement follows a similar structure, although the total fund is smaller. Individual allocations commonly range from hundreds of thousands to several million dollars.
Because allocations are calculated per source, systems with multiple wells or intakes may receive far greater total recovery than initially expected. Properly identifying and documenting all sources is therefore essential.
Final Takeaway
The 3M and DuPont PFAS settlements represent one of the largest infrastructure funding opportunities ever available to public water systems. At the same time, the process is deadline-driven and unforgiving of delay.
Water systems that begin testing early, gather documentation, and organize internal coordination will be in the strongest position to secure funding. Systems that postpone action risk losing substantial financial recovery intended to address drinking water contamination.
CleanGroundwater provides educational resources and updates about PFAS contamination nationwide. Water systems seeking claim evaluation or assistance with settlement participation may consult experienced environmental counsel such as Stag Liuzza to review eligibility and documentation requirements.
Communities should not bear the financial burden of contamination they did not cause. Acting before the Phase Two deadlines may determine whether a system secures funding or permanently forfeits it.
