The Environmental Protection Agency (EPA) recently proposed changes to federal PFAS drinking water regulations that could significantly affect how certain “forever chemicals” are regulated in the years ahead.
For public water systems, municipalities, and environmental stakeholders, the announcement raises important questions:
- Which PFAS standards are changing?
- What deadlines still apply?
- Does this affect contamination liability or settlement eligibility?
- What should water systems do now?
The short answer: some rules may change, but PFAS contamination risks and legal obligations are not disappearing.
What Did the EPA Actually Propose?
In May 2026, the EPA proposed rescinding federal drinking water regulations for several PFAS compounds while extending compliance timelines for others. According to the agency, the proposed changes are intended to create standards that are more legally durable and practical for implementation.
The EPA proposes rescinding regulations for:
- PFHxS (Perfluorohexane Sulfonic Acid)
- PFNA (Perfluorononanoic Acid)
- HFPO-DA (GenX chemicals)
- Certain PFAS mixture standards, including hazard index calculations involving PFBS and other compounds.
The EPA proposes keeping standards for:
- PFOA
- PFOS
These remain the two most widely studied and commonly detected PFAS compounds in drinking water systems. The EPA has indicated it intends to maintain enforceable Maximum Contaminant Levels (MCLs) for these chemicals.
Compliance deadlines may also shift
The EPA has proposed extending compliance deadlines for PFOA and PFOS treatment requirements to 2031, giving water systems additional time to implement remediation strategies and infrastructure improvements.
What Has NOT Changed
Although headlines may suggest a major rollback, several important realities remain unchanged.
PFAS contamination still exists
Regulatory changes do not eliminate contamination already present in drinking water systems. Public water systems across the country continue to detect PFAS in groundwater, source water, and distribution systems.
Treatment costs are still real
Even if standards shift, many systems will still face treatment expenses, filtration upgrades, testing obligations, and public communication requirements.
Liability concerns remain
Importantly, changing regulations do not necessarily eliminate claims involving contamination costs.
Many water systems continue evaluating:
- treatment expenses
- groundwater contamination impacts
- operational costs associated with PFAS
- unresolved damages outside existing settlements
For many municipalities, the practical financial burden of PFAS contamination remains the same regardless of regulatory timing.
Why This Matters for Public Water Systems
For municipal utilities and water operators, the proposed rule changes create uncertainty, but not necessarily relief.
Water systems still face important operational decisions, including:
- whether to continue monitoring at current levels
- how to budget for treatment infrastructure
- whether contamination costs should be pursued through litigation or settlements
- how to address long-term remediation planning
In many cases, contamination concerns extend beyond current drinking water thresholds. Groundwater impacts, wastewater treatment burdens, and infrastructure expenses may continue regardless of future federal rulemaking.
Water systems already evaluating PFAS contamination in drinking water should continue documenting costs and maintaining testing records as conditions evolve.
Could Future PFAS Standards Become More Strict?
Possibly.
Importantly, the EPA has not stated that these compounds are safe or no longer require regulation. Instead, the agency argues that portions of the prior rulemaking process may not withstand legal scrutiny and intends to reconsider standards through a new process.
EPA officials have stated that future standards for rescinded PFAS compounds could ultimately become equally strict or even stricter depending on scientific review and legal considerations.
This means public water systems should avoid assuming regulatory pressure is permanently decreasing.
What Water Systems Should Be Doing Right Now
Despite regulatory uncertainty, many municipalities may benefit from continuing proactive PFAS planning.
That may include:
- continuing PFAS testing and monitoring
- preserving contamination records and historical sampling data
- documenting treatment and operational costs
- evaluating unresolved damages tied to contamination
- reviewing ongoing settlement eligibility and claim opportunities
For systems participating in the 3M and DuPont PFAS settlements, deadlines and documentation requirements may still apply regardless of future EPA rule changes.
If your system is still evaluating eligibility under Phase Two PFAS claims, maintaining strong documentation remains critical.
Regulatory Changes Do Not Eliminate PFAS Challenges
Federal standards may evolve, but contamination concerns remain.
Public water systems across the country continue facing significant costs tied to PFAS detection, treatment, infrastructure upgrades, and long-term remediation planning. Regulatory uncertainty may affect timelines, but it does not erase the operational and financial realities many systems are already managing.
For municipalities and water systems, the most important question may not be whether standards change, but rather:
How should systems continue protecting their rights while the regulatory landscape evolves?
Stag Liuzza works with municipalities and public water systems navigating PFAS-related challenges, including settlement participation, contamination response, and unresolved damage claims.
