The two largest PFAS public-water-system settlements in U.S. history — 3M’s $10.3 billion and the combined $1.185 billion from DuPont, Chemours, and Corteva — are now in active distribution. But money does not flow automatically. Utilities that fail to meet 2026 filing deadlines forfeit their share, and the most consequential deadline is July 31, 2026 for the primary claims window. The Natural Resources Defense Council and several water-utility advocacy groups have warned that billions in available compensation could go unclaimed because small and mid-sized utilities, in particular, are unaware of the requirements or lack the legal staff to navigate the claim process.
The Settlement Stack
Two parallel settlements provide the funding pool, with overlapping but distinct rules:
| Settlement | Defendants | Pool | Distribution Mechanism |
|---|---|---|---|
| 3M settlement | 3M Company | $10.3 billion | Public Water System Settlement, paid over ~10 years |
| DuPont/Chemours/Corteva settlement | DuPont, Chemours, Corteva | $1.185 billion | Combined public water system settlement |
| Combined available pool | All four defendants | ~$13.6 billion including related funds | Allocation by PFAS Score and Adjusted Flow Rate |
The 3M settlement was finalized in 2023 and structured to compensate U.S. public water systems for current and future PFAS treatment costs. Allocations are calculated per impacted source using two factors: a PFAS Score (based on detected concentrations of PFOA, PFOS, and other regulated compounds) and an Adjusted Flow Rate (the volume of water the source produces). A single source with a PFAS Score of 100 and a flow rate of 10,000 gallons per minute corresponds to an estimated allocation exceeding $5 million — but the actual amount any utility receives depends on its specific data and proper, on-time filing.
The 2026 Deadline Calendar
Utilities that did not opt out in 2023 are automatically eligible for the settlements, but eligibility is not the same as receiving payment. To collect, utilities must file specific claims by specific dates:
| Date | What’s Due | Status |
|---|---|---|
| January 1, 2026 | Phase 2 enrollment deadline | Past — utilities not enrolled by this date are out |
| March 31, 2026 | Testing cost reimbursement claims | Past — claims for PFAS testing already conducted |
| July 1, 2026 | Baseline testing completion | Approaching — water sampling for PFAS must be completed |
| July 31, 2026 | Primary Action Fund claims deadline | Most consequential |
| August 1, 2026 | Special Needs Fund claims | For costs already incurred managing PFAS |
The July 31 deadline is the linchpin. Utilities that miss it forfeit their share of the Action Fund — the main pool of money for PFAS treatment infrastructure. They also forfeit their right to file future PFAS lawsuits against 3M, DuPont, Chemours, or Corteva. The settlement included a release of claims as the price of participation; opting in but failing to file is the worst of both outcomes.
Why NRDC Says Money May “Evaporate”
NRDC’s senior strategic director Erik D. Olson published an analysis warning that significant settlement funds could go unclaimed. The reasoning:
- Small utility unawareness. Many small systems (serving fewer than 10,000 people) do not have legal counsel monitoring class-action settlements and may not know they were enrolled by default.
- Documentation burden. Filing requires PFAS sampling data, treatment cost records, and consultant reports. Systems that have not yet detected PFAS — but were exposed and may detect later — have weaker documentation now than they will later.
- Engineering lead time. Action Fund claims require utilities to demonstrate planned PFAS treatment; small systems mid-way through engineering studies may not have project-ready documentation by July 31.
- Coordinator capacity. The settlement administrator can only process so many claims; late or incomplete filings carry rejection risk.
Several utility-finance and water-policy organizations — the National League of Cities, the Association of Metropolitan Water Agencies, and the Water Finance & Management trade press — have published increasingly urgent guidance to utilities in early 2026.
What This Money Actually Covers
The 3M and DuPont funds compensate utilities for two categories of cost:
- Capital cost of PFAS treatment: Granular activated carbon (GAC), ion exchange (IX), or reverse osmosis (RO) installation to bring PFAS detections below the federal 4 ppt MCL for PFOA and PFOS, and below 10 ppt for the (now-contested) PFHxS, PFNA, and HFPO-DA limits.
- Ongoing operational costs: Media replacement, monitoring, residuals disposal, and operator labor for the lifecycle of installed treatment.
Allocations are not income to the utility — they are reimbursement that flows through to ratepayers via reduced rate increases. A utility receiving a $5 million Action Fund allocation can either credit ratepayers directly (rare) or use the funds to avoid issuing $5 million in debt that would have been repaid through future rate increases. Either way, the money’s ultimate destination is the household water bill.
For context on the broader PFAS regulatory environment driving these treatment requirements, see our coverage of the 2024 EPA PFAS rule, the May 2025 PFAS rule rollback, and the April 2026 PFAS OUT initiative.
The Federal Compliance Deadline Has Slid — The Settlement Deadline Has Not
A key contrast: EPA pushed the federal PFOA and PFOS compliance deadline from 2029 to 2031 under the May 2025 rollback. The 3M and DuPont settlement deadlines have not moved. Utilities still have to file claims this year regardless of whether their treatment will be installed in 2028, 2030, or 2031. The settlement money is a fund for future treatment, not a payment conditioned on completed work.
Several state PFAS rules — Maine’s tightened limits, New Jersey’s rules, Massachusetts’s PFAS6 sum, Michigan’s seven-compound rule — also remain in force regardless of the federal extension. Utilities in those states are still on the original compliance schedule and have particular incentive to file claims now.
Who’s Affected
The settlement covers eligible public water systems that detect or have detected PFAS at any level above 0.005 parts per trillion (ppt). UCMR 5 monitoring data, published through 2024 and 2025, identified detectable PFAS in water serving roughly 158 million Americans, with EWG’s most recent analysis raising that number to 176 million (see our EWG 176M coverage). Most affected utilities are automatically enrolled.
The systems most at risk of missing the deadlines:
- Small systems (under 10,000 served) without dedicated legal counsel
- Utilities still in early-stage PFAS sampling that haven’t established baseline data
- Systems where local officials are unaware of the settlement because the original 2023 notification didn’t reach the right desks
- Wholesale water authorities with complex chains of distribution that may have unclear claim ownership
What You Can Do
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Contact your utility. Ask whether your water system has filed (or plans to file) Action Fund claims under the 3M and DuPont settlements. Public utilities are required to respond to ratepayer questions; if they don’t know the answer, that itself is informative.
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Check UCMR 5 data on your city page. Search your city on WaterVerge — UCMR 5 PFAS detections are visible for every public water system. If your utility has detected PFAS, it is almost certainly eligible for the settlement.
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Read the practical guides. Our PFAS contaminant profile and PFAS in drinking water guide cover what each compound does and where it comes from.
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Filter at the tap regardless of utility action. Settlement funds compensate for future treatment, but they don’t shorten the timeline. Point-of-use filtration is available now: reverse osmosis systems, under-sink filters with NSF/ANSI 53 + P473, and whole-house options.
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For local government officials: The National League of Cities, the Association of Metropolitan Water Agencies, and the Public Water System Settlement administrator all maintain claim-filing resources. The cost of legal review for filing is a tiny fraction of the potential allocation.
How WaterVerge Tracks This
WaterVerge integrates UCMR 5 PFAS detection data into city pages, providing the underlying data utilities need for settlement claims and that ratepayers need to verify their utility is acting. As settlement allocations are awarded and as utilities use the funds for treatment installation, those changes will appear in compliance histories and contaminant levels on city pages. Search your city to see current PFAS data for your utility.