Per- and polyfluoroalkyl substances (PFAS) are a large and diverse group of synthetic chemicals used for decades in industrial processes and consumer products. Their resistance to heat, water, oil, grease, and stains has made them useful in products such as certain food-packaging materials, textiles, nonstick coatings, firefighting foams, and specialized industrial applications.
Many PFAS are highly persistent. Some break down very slowly, while others can transform into persistent PFAS compounds. This persistence is why PFAS are often called “forever chemicals” and why managing them has become a long-term challenge for regulators, water utilities, waste facilities, manufacturers, and affected communities.
Removing PFAS from drinking water or wastewater is only part of the problem. Filtration and treatment commonly concentrate PFAS in spent filter media, treatment residuals, landfill leachate, sewage sludge, or other waste streams. Unless those materials are securely contained or the PFAS are effectively destroyed, the contamination may simply move from one place to another.
This article explains why PFAS disposal is difficult, how PFAS can circulate through landfills and wastewater systems, and what is currently known about containment and destruction methods.
What Are PFAS?
PFAS is a broad term covering thousands of fluorinated substances. The exact number depends on the definition and chemical inventory being used. Frequently discussed PFAS include:
- Perfluorooctanoic acid (PFOA)
- Perfluorooctane sulfonic acid (PFOS)
- Perfluorononanoic acid (PFNA)
- Perfluorohexane sulfonic acid (PFHxS)
- Hexafluoropropylene oxide dimer acid and its ammonium salt, commonly associated with GenX processing aids
- Perfluorobutane sulfonic acid (PFBS)
PFAS do not all behave in the same way. They differ in chemical structure, mobility, persistence, tendency to accumulate in living organisms, and response to treatment. For that reason, a disposal or treatment method that performs well for one group of PFAS may be less effective for another.
Why PFAS Disposal Is Difficult
The carbon-fluorine bonds found in PFAS are exceptionally strong. This chemical stability helps explain both their commercial usefulness and their resistance to many natural and conventional treatment processes.
PFAS may remain in water, soil, sediment, waste, and living organisms for long periods. Some PFAS are also highly mobile in water, increasing the likelihood of their transport from disposal sites into leachate, groundwater, surface water, or treatment systems.
Capturing PFAS does not necessarily destroy PFAS.
Instead, treatment can transfer PFAS between environmental media and waste streams, including:
- Drinking water to spent activated carbon, ion-exchange resin, or membrane concentrate
- Landfilled waste to landfill leachate
- Wastewater to treated effluent, sludge, or biosolids
- Contaminated soil to groundwater or stormwater
- Thermal treatment feedstock to ash, air emissions, or incomplete-destruction byproducts if operating conditions are inadequate
This transfer problem is central to PFAS management. A treatment process may reduce PFAS in one stream while creating a smaller, more concentrated waste stream that still requires careful handling.
Potential Health Concerns Associated With PFAS
Scientific understanding continues to develop, and health effects vary by compound, exposure level, exposure duration, and individual susceptibility. Research involving certain PFAS has identified associations with several adverse health outcomes.
Health effects studied in relation to exposure to certain PFAS include:
- Reduced immune response, including reduced antibody response to some vaccines
- Changes in cholesterol levels
- Liver effects
- Developmental and reproductive effects
- Pregnancy-related effects
- Thyroid-related effects
- Increased risk of certain cancers, including kidney and testicular cancer, for some PFAS
These findings should not be interpreted as proof that every PFAS produces the same effects. Many PFAS remain less thoroughly studied than PFOA and PFOS, and research continues on long-term, low-level exposure and exposure to PFAS mixtures.
Current PFAS Waste-Management Approaches
PFAS-containing wastes may be managed through several approaches, depending on the type and concentration of the waste, applicable regulations, available facilities, and site-specific risks. Major approaches include:
- Storage or containment
- Disposal in appropriately engineered landfills
- Underground injection for certain liquid wastes
- Thermal treatment under controlled operating conditions
- Emerging destruction technologies
- Wastewater treatment followed by management of residuals and concentrates
No single method is appropriate for every PFAS-containing material. Decisions must consider the waste form, PFAS profile, concentration, potential for environmental release, and whether the method contains, transfers, or destroys the chemicals.
PFAS and Thermal Destruction
High-temperature thermal treatment can be used for certain PFAS-containing wastes, but successful destruction depends on more than temperature alone. Important factors include residence time, turbulence, oxygen availability, waste composition, combustion efficiency, emissions controls, and the specific PFAS present.
Key questions include:
- Which PFAS and precursor compounds are destroyed under the selected conditions?
- Are short-chain PFAS or other fluorinated compounds formed during treatment?
- How completely are organic fluorine and other fluorinated byproducts accounted for?
- Are operating temperatures and residence times consistently maintained?
- How are stack emissions, ash, scrubber water, and other residuals monitored?
EPA guidance identifies certain hazardous-waste combustors operating under specified conditions as a potentially effective option for selected PFAS-containing materials. This does not mean that all incinerators or ordinary municipal waste-combustion systems should be assumed to completely destroy PFAS.
Why Verification Matters
Measuring destruction can be difficult because PFAS may transform into other fluorinated substances that are not included in a limited analytical test panel. A credible destruction assessment therefore requires appropriate sampling, validated analytical methods, emissions monitoring, and evaluation of treatment residuals.
Emerging PFAS Destruction Technologies
Researchers and technology developers are evaluating alternatives intended to break down PFAS rather than merely capture them. Examples under development or limited deployment include:
- Supercritical water oxidation
- Hydrothermal alkaline treatment
- Electrochemical oxidation
- Plasma-based treatment
- Ultraviolet and chemical-reduction processes
- Mechanochemical treatment
Some of these technologies have shown promising results for specific waste streams, but performance can vary substantially. Scale, energy use, cost, corrosion, byproduct formation, pretreatment requirements, and the ability to treat complex real-world wastes remain important considerations.
PFAS and Landfills
Landfills receive many materials that may contain PFAS, including treated textiles, carpets, upholstered furniture, certain food-packaging materials, construction products, industrial waste, spent treatment media, and contaminated soil.
Landfilling contains waste rather than destroying the PFAS within it. The degree of protection depends heavily on landfill design, liner and leachate-collection systems, operating practices, waste characteristics, long-term maintenance, and the facility’s regulatory controls.
Landfill Leachate
Landfill leachate is liquid produced when water passes through waste or when moisture is released from the waste itself. PFAS can migrate from discarded products and contaminated materials into this liquid.
Collected leachate may be treated on site, sent to a specialized facility, or discharged to a wastewater treatment plant under an approved arrangement. Sending leachate to a conventional wastewater facility does not ensure that PFAS will be destroyed. It may instead move PFAS into treated effluent, sludge, biosolids, or concentrated treatment residuals.
Engineered Landfill Controls
For relatively high-concentration PFAS wastes, current EPA guidance generally favors landfills with strong engineering and regulatory controls, such as permitted hazardous-waste landfills, when landfill disposal is selected. These facilities are designed to provide more robust containment and leachate management than ordinary solid-waste disposal sites.
Long-Term Questions
Ongoing research and monitoring are needed to understand:
- How different PFAS and precursor compounds behave as waste ages
- How effectively liners and leachate systems limit releases over time
- How PFAS move through landfill gas, leachate, sediment, and groundwater
- How rainfall, flooding, drought, and other changing conditions affect leachate generation
- How collected leachate and spent treatment media should ultimately be managed
PFAS and Wastewater Treatment Plants
Wastewater treatment plants can receive PFAS from homes, businesses, industries, airports, military facilities, landfills, and contaminated groundwater-management systems.
Potential sources include:
- Industrial discharges
- Landfill leachate
- PFAS-containing consumer products entering household wastewater
- Firefighting-foam residues
- Commercial cleaning and finishing processes
- Manufacturing operations
- Wastewater from contaminated-site remediation
Conventional wastewater treatment plants were not designed specifically to destroy PFAS. Depending on the compounds and treatment process, PFAS may pass through to treated effluent, accumulate in sludge, transform from precursor compounds into measurable terminal PFAS, or become concentrated in residual waste streams.
Sewage Sludge and Biosolids
Sewage sludge is the solid, semisolid, or liquid residue generated during wastewater treatment. “Biosolids” generally refers to sewage sludge that has been treated and meets applicable requirements for beneficial use.
PFAS in sewage sludge and biosolids have become a significant regulatory and scientific concern because land application can create pathways to soil, crops, livestock, surface water, and groundwater. In 2026, EPA released draft guidance focused on reducing risks from PFOA and PFOS in biosolids, reflecting the growing attention being given to this part of the PFAS lifecycle.
Important questions include:
- Which upstream sources contribute most to PFAS loading?
- How do individual PFAS partition between water and solids?
- How mobile are PFAS after land application?
- How should contaminated sludge, biosolids, and treatment residuals be managed?
- Which monitoring, source-control, and treatment strategies are practical and effective?
Why PFAS Can Create a Circular Waste Problem
PFAS may move through multiple systems without being fully destroyed. A simplified cycle can look like this:
- A PFAS-containing product or contaminated material enters a landfill.
- PFAS migrate into landfill leachate.
- The leachate is sent to a wastewater treatment plant.
- Some PFAS remain in treated effluent, sludge, biosolids, or other residuals.
- Those residuals are land-applied, landfilled, stored, or sent for further treatment.
- PFAS may again enter leachate, soil, surface water, or groundwater.
A similar challenge exists with drinking-water treatment. Activated carbon, ion-exchange resin, and membrane systems can remove PFAS from water, but the spent media or concentrated reject stream must still be managed appropriately.
This is why PFAS policy increasingly emphasizes the full chemical lifecycle rather than evaluating each treatment step in isolation.
The Importance of Source Reduction
Because disposal and destruction remain technically difficult and costly, preventing unnecessary PFAS use and releases is an important long-term strategy.
Source-reduction measures may include:
- Replacing PFAS in applications where safer and effective alternatives are available
- Eliminating nonessential uses
- Improving industrial pretreatment and discharge controls
- Separating highly contaminated waste streams before they reach municipal systems
- Collecting and managing PFAS-containing firefighting foams responsibly
- Improving product disclosure, procurement standards, and waste tracking
Reducing PFAS entering commerce and waste systems can lower future treatment costs and help prevent repeated movement of contamination between water, soil, sludge, and landfills.
How Communities and Utilities Are Responding
Responses vary by location, contamination source, available funding, and state or federal requirements. Common approaches include:
- Testing public water systems and private wells
- Investigating suspected contamination sources
- Installing drinking-water treatment
- Establishing industrial pretreatment or discharge limits
- Monitoring landfill leachate and groundwater
- Sampling wastewater, sludge, and biosolids
- Providing alternative water supplies where necessary
- Pursuing cleanup costs from responsible parties
PFAS requirements and guidance continue to evolve. Waste generators and facility operators should consult the latest federal, state, and local requirements rather than relying on a single nationwide disposal assumption.
What This Means for Homeowners
PFAS disposal is primarily a community, utility, industrial, and regulatory issue, but homeowners can still take practical steps to better understand potential exposure through drinking water.
- Review your water utility’s annual Consumer Confidence Report and any PFAS-specific notices.
- Check state or local environmental and health-department resources for PFAS testing data.
- Private-well users in an affected area may consider testing through a qualified laboratory using an appropriate PFAS method.
- Follow local advisories when contamination has been identified.
- Choose filtration based on documented testing for the specific PFAS of concern.
- Replace filter elements on schedule and follow the manufacturer’s installation and maintenance instructions.
Not every filter reduces PFAS, and performance can differ by filter media, PFAS type, water chemistry, flow rate, and service life. Product claims should therefore be evaluated against available laboratory data rather than assumed from the presence of activated carbon alone.
Berkey filtration information: Independent laboratory testing has reported reduction of selected perfluorinated chemicals by Black Berkey® Elements under the stated test conditions. Review the applicable test data, system configuration, filter-element instructions, and replacement guidance before selecting a system for a specific water-quality concern.
Review available filter test results or learn about the Big Berkey® Water Filter System.
Frequently Asked Questions About PFAS Disposal
Does water filtration destroy PFAS?
Usually not. Technologies such as activated carbon, ion exchange, and reverse osmosis can remove PFAS from water and transfer them into spent media or a concentrated reject stream. Those residuals still require appropriate management.
Do wastewater treatment plants remove PFAS?
Conventional wastewater treatment was not designed to destroy PFAS. Some PFAS may bind to solids, while others remain in treated water. Precursor compounds can also transform during treatment, making measured concentrations appear to increase for certain PFAS.
Can PFAS be safely incinerated?
Certain hazardous-waste combustors operating under carefully controlled conditions may effectively destroy selected PFAS wastes. Complete destruction should not be assumed for every incinerator, waste type, or operating condition. Monitoring of emissions and residuals is essential.
Are landfills a permanent PFAS solution?
Landfills provide containment rather than chemical destruction. Properly engineered facilities can reduce the risk of release, but leachate, landfill gas, long-term maintenance, and final management of collected PFAS remain important considerations.
Why is source reduction important?
Preventing unnecessary PFAS use and controlling industrial releases can reduce the volume of contaminated water, sludge, soil, and waste that must later be treated or disposed of.
Conclusion
PFAS contamination is difficult to manage because capture is not the same as destruction. Landfills, wastewater plants, drinking-water systems, and remediation projects can reduce PFAS in one location while producing contaminated residuals that require further treatment, containment, or disposal.
Current management options include engineered landfills, underground injection for certain wastes, controlled thermal treatment, and a growing range of emerging destruction technologies. Each option has limitations, and no single approach is suitable for every PFAS-containing material.
Long-term progress will require a lifecycle strategy: reduce unnecessary PFAS use, control releases at the source, improve monitoring, select treatment methods tailored to the specific waste stream, and verify that PFAS are truly destroyed rather than merely transferred elsewhere.