Deep dive: PFAS remediation & emerging contaminants — what's working, what's not, and what's next

Per- and polyfluoroalkyl substances (PFAS), the class of over 14,000 synthetic chemicals often called "forever chemicals," have been detected in the drinking water of more than 100 million Americans and in waterways across every inhabited continent, according to the US Geological Survey. Despite growing regulatory urgency, with enforceable US federal maximum contaminant levels (MCLs) taking effect in 2026 and the EU's proposed universal PFAS restriction advancing through ECHA review, the remediation industry remains in a state of rapid but uneven evolution. Some treatment technologies are delivering reliable results at municipal scale, while others remain trapped in pilot-phase limitations that make their near-term deployment uncertain. Understanding the current state of play is essential for water utilities, industrial operators, regulators, and sustainability leaders navigating a compliance landscape that is shifting faster than the technology can mature.

Why It Matters

The scale of PFAS contamination is staggering. The US Environmental Protection Agency's 2024 Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) found detectable PFAS in approximately 45% of tested US public water systems, affecting communities of all sizes. The European Environment Agency estimates that over 17,000 sites across Europe are contaminated with PFAS above thresholds of concern, with remediation costs projected between EUR 50 billion and EUR 170 billion over the next two decades. In Australia, the Department of Defence has identified over 30 current and former military bases requiring PFAS remediation at an estimated cost exceeding AUD 3 billion.

The regulatory trajectory is accelerating across all major jurisdictions. The US EPA finalized the first-ever national PFAS drinking water standard in April 2024, setting MCLs of 4 parts per trillion (ppt) for PFOA and PFOS individually and a hazard index approach for mixtures of PFHxS, PFNA, HFPO-DA (GenX), and PFBS. Public water systems must comply by 2029, with initial monitoring beginning in 2025. The EU's proposed universal PFAS restriction, submitted by five member states to ECHA in January 2023, would ban the manufacture, use, and import of all PFAS with limited exemptions, a measure that would fundamentally reshape global chemical supply chains if adopted in its current scope.

The financial exposure extends beyond remediation costs. 3M agreed to pay $10.3 billion to settle municipal water contamination claims in June 2023, and Chemours, DuPont, and Corteva committed $1.185 billion in parallel settlements. The total PFAS litigation liability across manufacturers, military facilities, airports, and industrial sites is estimated at $30-50 billion by Bloomberg Intelligence, making PFAS one of the largest environmental liability categories in history. For corporate sustainability leaders, PFAS exposure increasingly appears in ESG risk assessments, supply chain due diligence requirements, and investor scrutiny.

Key Concepts

Granular Activated Carbon (GAC) is the most widely deployed PFAS treatment technology for drinking water, using porous carbon media to adsorb PFAS molecules from water as it passes through fixed-bed columns. GAC effectively removes long-chain PFAS compounds (PFOA, PFOS) to below 4 ppt MCLs but performs poorly against short-chain PFAS and ultrashort-chain compounds. Bed life varies from 6 months to 3 years depending on influent PFAS concentrations and competing organic matter, creating significant ongoing operational costs for carbon replacement and reactivation or disposal.

Ion Exchange Resins (IX) use synthetic polymer beads functionalized with charged groups that selectively bind PFAS anions from water. Single-use IX resins offer higher PFAS removal capacity than GAC (typically 3-10 times longer bed life) and are more effective against short-chain PFAS compounds. Regenerable IX systems reduce waste volume but require management of concentrated PFAS brine streams that themselves need destruction treatment. IX has emerged as the preferred technology for systems facing stringent short-chain PFAS requirements.

High-Temperature Incineration remains the primary destruction method for PFAS-containing waste, requiring temperatures above 1,100 degrees Celsius to break the carbon-fluorine bonds that give PFAS their environmental persistence. Cement kilns and hazardous waste incinerators operating at sufficient temperatures can achieve over 99.99% destruction of most PFAS compounds, but questions persist about whether incomplete combustion generates fluorinated byproducts. The US EPA proposed new rules in 2024 requiring facilities burning PFAS-containing waste to monitor stack emissions for fluorinated organic compounds.

Electrochemical Oxidation applies electrical current through specialized electrodes (boron-doped diamond or substoichiometric titanium oxide) to generate reactive species that mineralize PFAS into fluoride ions, carbon dioxide, and water. This technology has demonstrated over 99% PFAS destruction in concentrated waste streams (spent IX regenerant brines, landfill leachate, firefighting foam concentrates) at pilot scale, positioning it as the most promising non-thermal destruction pathway.

Supercritical Water Oxidation (SCWO) subjects PFAS-containing water to temperatures above 374 degrees Celsius and pressures above 221 bar, creating a supercritical fluid environment where organic compounds, including PFAS, undergo rapid and complete oxidation. SCWO achieves greater than 99.99% destruction efficiencies for all tested PFAS compounds, including ultrashort-chain species resistant to other treatments, but high capital costs and energy requirements currently limit deployment to concentrated waste streams.

PFAS Remediation KPIs by Technology

Metric	GAC Adsorption	Ion Exchange (IX)	Electrochemical Oxidation	SCWO	High-Temp Incineration
PFOA/PFOS Removal	>99%	>99%	>99% (destruction)	>99.99% (destruction)	>99.99% (destruction)
Short-Chain PFAS Removal	40-70%	85-99%	>95% (destruction)	>99.99% (destruction)	>99% (destruction)
Treatment Cost (per 1,000 gal)	$0.50-2.00	$0.80-3.50	$5-25 (concentrates)	$10-50 (concentrates)	Variable
Capital Cost (1 MGD system)	$2-6M	$3-8M	$1-3M (pilot)	$5-15M	N/A
Technology Readiness Level	9 (commercial)	9 (commercial)	6-7 (pilot/demo)	6-7 (pilot/demo)	9 (commercial)
Waste Stream Generated	Spent carbon	Spent resin or brine	Fluoride salts	Fluoride salts	Ash, potential emissions

What's Working

Municipal GAC and IX Treatment at Scale

The most immediate success story in PFAS remediation is the proven deployment of adsorption and ion exchange treatment at municipal drinking water scale. Wilmington, North Carolina, where the Cape Fear Public Utility Authority serves over 300,000 residents downstream from Chemours' Fayetteville Works facility, installed a GAC treatment system in 2022 that has consistently reduced finished water PFAS concentrations from 50-80 ppt to below 2 ppt across all regulated compounds. The $46 million capital investment, funded through a combination of state revolving fund loans and manufacturer settlement proceeds, processes 40 million gallons per day with operational costs of approximately $1.20 per thousand gallons treated. The system's performance has been independently verified by the North Carolina Department of Environmental Quality through quarterly monitoring.

In Michigan, the state's comprehensive PFAS Action Response Team (MPART) has overseen installation of treatment systems at 27 public water supplies since 2020, protecting over 500,000 residents. The program, backed by $340 million in state and federal funding, has prioritized IX resin technology for systems facing short-chain PFAS contamination from firefighting foam use at military and civilian airports. Oscoda Township's treatment system, addressing contamination from the former Wurtsmith Air Force Base, combines IX and GAC in a multi-barrier approach that achieves non-detect levels for all 29 PFAS analytes in the EPA's UCMR 5 method.

Electrochemical Destruction Pilot Successes

Aclarity, a Connecticut-based startup, has operated pilot electrochemical oxidation systems at over 20 sites across the US since 2022, treating firefighting foam rinsates, landfill leachate, and IX regenerant brines. The company's boron-doped diamond electrode technology has demonstrated greater than 99% defluorination of PFAS in concentrated waste streams, converting PFAS to fluoride ions, CO2, and water with no hazardous byproducts. The US Department of Defense's Strategic Environmental Research and Development Program (SERDP) funded a 2024 validation study at Joint Base Cape Cod that confirmed Aclarity's destruction efficiency across a mixture of over 40 PFAS compounds present in aqueous film-forming foam (AFFF) concentrates. Operational costs for concentrated waste treatment averaged $15-25 per thousand gallons, competitive with off-site incineration when transportation costs are included.

Australia's National PFAS Management Framework

Australia's Department of Defence PFAS Investigation and Management Program represents one of the most systematic approaches to site characterization and risk management globally. The program, covering 30+ current and former military bases, has completed detailed site investigations using a standardized framework that maps contamination plumes in soil, groundwater, and surface water across all affected installations. At RAAF Base Williamtown in New South Wales, a $130 million remediation program installed a groundwater extraction and treatment system processing 12 million liters per day through a GAC and IX treatment train, preventing further migration of PFAS into the surrounding Hunter River estuary. The program's open data approach, publishing all investigation reports and monitoring data publicly, has established a transparency benchmark that other national programs are adopting.

What's Not Working

Soil and Groundwater Source Zone Treatment

While drinking water treatment has matured rapidly, remediating PFAS at the source (contaminated soil and groundwater beneath industrial facilities, fire training areas, and landfills) remains largely ineffective at field scale. Pump-and-treat systems extract contaminated groundwater for above-ground treatment but cannot address PFAS sorbed to soil particles that serve as a persistent re-release source. Soil excavation and off-site disposal is prohibitively expensive for large contamination zones and merely transfers the problem to landfills. In-situ soil treatment technologies including soil washing, chemical oxidation, and bioremediation have shown limited field-scale success against PFAS due to the compounds' resistance to degradation and their complex partitioning behavior in heterogeneous subsurface environments. The US EPA's 2024 Interim PFAS Destruction Guidance acknowledged that "no commercially proven technology currently exists for complete in-situ PFAS destruction in soil or groundwater."

Regulatory Fragmentation Across Jurisdictions

The absence of globally harmonized PFAS standards creates compliance challenges for multinational operators and inconsistent public health protection. US federal MCLs address only six PFAS compounds, while some states (Michigan, New Jersey, Vermont) regulate additional compounds at varying levels. The EU's proposed universal restriction takes a class-based approach covering all 14,000+ PFAS, while individual member states maintain their own interim standards. Denmark has banned all PFAS in food contact materials since 2020, but most other nations lack similar use restrictions. This patchwork means that water utilities, industrial dischargers, and consumer product manufacturers must navigate dozens of overlapping and sometimes contradictory requirements, increasing compliance costs without proportionally improving environmental outcomes.

Disposal and Destruction Bottleneck

The growing volume of PFAS-contaminated waste from water treatment, site remediation, and product disposal has overwhelmed existing destruction capacity. Spent GAC and IX resins containing concentrated PFAS require high-temperature incineration or emerging destruction technologies, but permitted hazardous waste incineration capacity in the US operates near full utilization. The EPA's proposed rule restricting PFAS disposal in landfills, combined with uncertainty about incineration emissions, has created a "disposal dilemma" where treatment systems generate waste that cannot be economically or safely managed. Stockpiling of PFAS-containing waste at treatment facilities is an interim measure that concentrates liability rather than resolving it.

Key Players

Established Leaders

Veolia Water Technologies operates the largest installed base of PFAS treatment systems globally, deploying GAC and IX solutions across municipal and industrial applications in North America, Europe, and Australia. The company's PFAS Center of Excellence in France conducts pilot testing for site-specific treatment optimization.

Evoqua Water Technologies (now part of Xylem) provides mobile and permanent PFAS treatment systems with particular strength in IX resin applications for short-chain PFAS removal. The company operates a national service network for GAC changeout and IX resin management.

SUEZ Water Technologies (now part of Veolia) brings extensive European experience in PFAS treatment, operating full-scale municipal systems in the Netherlands, Belgium, and Germany where PFAS regulations preceded US requirements.

Emerging Startups

Aclarity has developed electrochemical oxidation systems for PFAS destruction in concentrated waste streams, with DoD-validated performance data and growing commercial deployment for firefighting foam and industrial wastewater treatment.

374Water commercializes supercritical water oxidation for PFAS destruction, operating units at military installations and industrial sites with demonstrated greater than 99.99% destruction efficiency across all PFAS chain lengths.

Oxyle (Switzerland) uses advanced oxidation processes with proprietary catalyst technology for PFAS destruction in industrial wastewater, targeting the European market where the proposed universal PFAS restriction will drive demand for destruction solutions.

Cyclopure has developed cyclodextrin-based adsorbent media (DEXSORB) that selectively binds PFAS at higher capacity than GAC, reducing media replacement frequency and waste generation. The technology has received NSF/ANSI 53 certification for point-of-use drinking water treatment.

Key Investors and Funders

US Department of Defense SERDP/ESTCP provides the largest single source of PFAS remediation technology R&D funding globally, supporting research, development, and field demonstration of emerging treatment and destruction technologies at military installations.

US EPA Water Infrastructure Finance and Innovation Act (WIFIA) provides low-interest federal loans for PFAS treatment infrastructure at public water systems, with $12 billion in Bipartisan Infrastructure Law funding dedicated to emerging contaminant treatment.

European Investment Bank has financed PFAS remediation projects across EU member states, recognizing PFAS contamination as a priority environmental liability under its climate and environmental sustainability framework.

Action Checklist

• Conduct comprehensive PFAS sampling across all drinking water sources, wastewater effluent, and stormwater discharge points using EPA Method 533 or 1633
• Map potential PFAS source areas within operational footprint, including fire training areas, industrial process areas, and waste handling zones
• Evaluate exposure to incoming PFAS regulations across all operating jurisdictions, including US EPA MCLs, state-level standards, and EU restriction proposals
• Assess supply chain PFAS usage to identify products, processes, and inputs containing intentionally added PFAS that may face use restrictions
• Engage treatment technology vendors with demonstrated full-scale performance data and independent verification of PFAS removal or destruction claims
• Develop a PFAS phase-out strategy for operational inputs, prioritizing substitution of PFAS-containing firefighting foams, coatings, and process chemicals
• Quantify PFAS-related financial exposure including remediation costs, litigation reserves, and regulatory compliance capital requirements
• Participate in industry working groups and regulatory comment periods to shape practical, science-based PFAS management standards

FAQ

Q: What PFAS concentration levels require treatment action under current US regulations? A: The US EPA's final PFAS National Primary Drinking Water Regulation sets MCLs of 4 ppt for PFOA and 4 ppt for PFOS individually, with a hazard index of 1.0 for mixtures of PFHxS, PFNA, HFPO-DA (GenX), and PFBS. Public water systems must complete initial monitoring by 2027 and achieve compliance by 2029. Some states enforce stricter standards: Michigan's PFAS rules set MCLs for seven compounds, with PFOA at 8 ppt and PFOS at 16 ppt, while Vermont and New Hampshire set combined PFAS limits at 20 ppt for five compounds. Industrial discharge permits may impose even lower limits based on receiving water quality standards.

Q: How should organizations prioritize among available PFAS treatment technologies? A: Technology selection depends on four factors: the PFAS compounds present (long-chain vs. short-chain), influent concentrations, treatment volume, and waste management capabilities. For drinking water treatment at municipal scale, IX resin provides the best combination of removal efficiency across chain lengths and operational simplicity. GAC remains cost-effective where long-chain PFAS dominate and short-chain compounds are below regulatory thresholds. For concentrated waste streams (IX regenerant brines, firefighting foam rinsates, landfill leachate), electrochemical oxidation and SCWO offer on-site destruction that avoids off-site disposal liability. Organizations should conduct bench-scale or pilot testing with site-specific water before committing to full-scale technology selection.

Q: What is the realistic cost to treat PFAS in a mid-sized municipal water system? A: For a 5 million gallon per day (MGD) system treating groundwater with PFAS concentrations of 20-50 ppt, capital costs typically range from $8-15 million for GAC or IX treatment infrastructure. Annual operating costs, including media replacement or regeneration, monitoring, and labor, add $500,000-1.5 million. Total treatment cost translates to approximately $0.80-2.50 per thousand gallons, representing a 15-30% increase in typical water production costs. The Bipartisan Infrastructure Law's $9 billion in emerging contaminant funding, distributed through state revolving funds, provides grants and low-interest loans that can offset 40-80% of capital costs for eligible systems.

Q: Can PFAS be completely destroyed, or does treatment merely concentrate the problem? A: Adsorption technologies (GAC, IX, specialized media) remove PFAS from water but transfer them to spent media that requires disposal or destruction. True PFAS destruction, breaking the carbon-fluorine bond to yield harmless fluoride ions, is achievable through high-temperature incineration (above 1,100 degrees Celsius), electrochemical oxidation, supercritical water oxidation, and certain advanced oxidation processes. Of these, high-temperature incineration is commercially available at scale, while electrochemical and SCWO systems are rapidly advancing from pilot to commercial deployment. Complete mineralization of PFAS to fluoride is achievable with current technology, but scaling destruction capacity to match the growing volume of PFAS-contaminated waste remains the central challenge.

Q: How does the EU's proposed universal PFAS restriction differ from the US approach? A: The approaches are fundamentally different in scope and philosophy. The US regulates individual PFAS compounds through enforceable drinking water standards, with no federal ban on PFAS manufacturing or use. The EU's proposed restriction would ban the manufacture, import, and use of all PFAS (the entire class of over 14,000 compounds) with time-limited exemptions for essential uses where no alternatives exist. If adopted in its current form, the restriction would take effect in stages between 2026 and 2032, affecting industries from semiconductors and medical devices to textiles and food packaging. The class-based approach eliminates the "regrettable substitution" problem where manufacturers replace one regulated PFAS with another unregulated variant, but creates significant transition challenges for industries dependent on PFAS performance properties.

Sources

• US Environmental Protection Agency. (2024). PFAS National Primary Drinking Water Regulation: Final Rule. Federal Register, 89 FR 32532. Washington, DC: EPA.
• European Chemicals Agency. (2023). Universal PFAS Restriction Proposal: Annex XV Report. Helsinki: ECHA.
• US Geological Survey. (2023). Per- and Polyfluoroalkyl Substances in Tap Water from Public and Private Sources in the United States. Washington, DC: USGS.
• Interstate Technology and Regulatory Council. (2025). PFAS Technical and Regulatory Guidance Document, Version 3.0. Washington, DC: ITRC.
• US Department of Defense SERDP/ESTCP. (2024). PFAS Remediation Technology Validation Program: Electrochemical Oxidation Field Demonstration Results. Alexandria, VA: DoD.
• European Environment Agency. (2024). Emerging Chemical Risks in Europe: PFAS Contamination Assessment. Copenhagen: EEA.
• Bloomberg Intelligence. (2025). PFAS Litigation and Liability Tracker: Estimated Global Exposure Analysis. New York: Bloomberg LP.