Removing PFAS from drinking water, wastewater, or contaminated soil does not necessarily eliminate the chemicals. In many cases, treatment simply concentrates PFAS into another material that still has to be managed.
For example, PFAS removed from drinking water may end up in spent activated carbon or ion-exchange resin. PFAS entering wastewater may remain in treated effluent, sewage sludge, or other residuals. PFAS-containing waste placed in a landfill may later contribute to landfill leachate.
Quick answer: PFAS disposal is difficult because many PFAS are extremely persistent and resist conventional degradation. Landfills can contain PFAS, treatment systems can capture them, and certain thermal or emerging processes may destroy selected PFAS under appropriate conditions—but no single approach is suitable for every PFAS-containing waste stream.
This creates a central challenge:
How do we prevent PFAS from simply moving from water to filters, from filters to landfills, from landfills to leachate, and from leachate back into wastewater?
In This Guide
- What Are PFAS?
- Why PFAS Are Difficult to Dispose Of
- Capture vs. Destruction
- EPA's 2026 Disposal Guidance
- Landfills
- Landfill Leachate
- Underground Injection
- Thermal Destruction
- Emerging Technologies
- Wastewater Treatment
- Sewage Sludge & Biosolids
- Spent Water Filters
- The Circular PFAS Problem
- Source Reduction
- What Homeowners Should Know
- Frequently Asked Questions
What Are PFAS?
PFAS stands for per- and polyfluoroalkyl substances.
It is a broad family of manufactured fluorinated chemicals that has been used in industrial processes and consumer products since the 1940s.
Applications have included products designed to resist:
- Water
- Oil
- Grease
- Heat
- Stains
Frequently discussed PFAS include:
- PFOA
- PFOS
- PFNA
- PFHxS
- PFBS
- HFPO-DA, commonly associated with GenX processing aids
PFAS are not one chemical. Thousands of PFAS exist, and they can differ greatly in persistence, mobility, bioaccumulation, toxicity, and treatment response.
Why Are PFAS So Difficult to Dispose Of?
One reason many PFAS are so persistent is the strength of their carbon-fluorine bonds.
The same chemical stability that made many PFAS useful in industrial applications also makes them resistant to:
- Natural degradation
- Conventional biological treatment
- Ordinary wastewater processes
- Many standard waste-treatment methods
Some PFAS can also move readily through water.
This creates pathways through:
- Groundwater
- Surface water
- Landfill leachate
- Wastewater
- Soil
Capturing PFAS Is Not the Same as Destroying PFAS
This is the most important concept in understanding PFAS disposal.
Consider a drinking-water filter.
If the filter reduces PFAS in the water, the chemicals do not simply vanish.
Depending on the technology, they may become concentrated in:
- Activated carbon
- Ion-exchange resin
- Membrane concentrate
- Other treatment residuals
The same transfer occurs elsewhere.
| PFAS Starts In | Treatment or Process | PFAS May End Up In |
|---|---|---|
| Drinking water | Activated carbon | Spent carbon media |
| Drinking water | Ion exchange | Spent resin |
| Drinking water | Reverse osmosis | Concentrate or reject stream |
| Wastewater | Wastewater treatment | Effluent, sludge or residuals |
| Solid waste | Landfilling | Contained waste and potentially leachate |
A treatment system can work very well at removing PFAS from water without chemically destroying the PFAS. Therefore, disposal of the resulting concentrated waste becomes part of the treatment problem.
EPA's 2026 PFAS Destruction and Disposal Guidance
In 2026, the EPA updated its interim guidance on the destruction and disposal of PFAS-containing materials.
The guidance focuses primarily on three large-scale approaches currently available for PFAS-containing waste:
- Engineered landfills
- Underground injection
- Thermal destruction
The guidance does not establish one universal disposal method.
Instead, decision-makers must consider:
- Waste type
- PFAS concentration
- Physical form of the waste
- Available facilities
- Potential release pathways
- Transportation risks
- Long-term monitoring
- Applicable state and federal requirements
EPA's PFAS destruction and disposal guidance is nonbinding. Actual legal requirements can depend on the waste, facility, location, and applicable federal or state environmental programs.
PFAS Disposal in Landfills
Landfills receive many materials that can contain PFAS.
Examples may include:
- Contaminated soil
- Spent treatment media
- Industrial waste
- Some treated textiles
- Some carpets and furnishings
- PFAS-containing remediation waste
A landfill does not chemically destroy PFAS.
Its purpose is primarily containment.
Why Landfill Design Matters
Containment depends on systems such as:
- Engineered liners
- Leachate collection
- Groundwater monitoring
- Stormwater management
- Cover systems
- Long-term facility maintenance
For some higher-concentration PFAS waste, more highly controlled facilities may be appropriate because they provide additional engineering and regulatory safeguards.
Landfilling should not be described as PFAS destruction. It is a containment strategy whose effectiveness depends on the facility and long-term management.
What Is Landfill Leachate?
Leachate is liquid that has come into contact with waste inside a landfill.
It can form from:
- Rainwater entering the landfill
- Water already present in discarded materials
- Decomposition processes
PFAS can migrate from discarded materials into landfill leachate.
Modern landfills commonly collect leachate, but collection creates another question:
What happens to the collected liquid?
It may be:
- Treated onsite
- Sent to another treatment facility
- Sent to a wastewater treatment plant under an approved arrangement
If conventional wastewater treatment does not destroy the PFAS, some of those chemicals can again move into effluent, sludge, or other treatment residuals.
Underground Injection of PFAS Waste
Certain liquid PFAS-containing wastes may be managed through appropriately permitted underground injection wells.
This approach places liquid waste into deep geological formations designed for long-term isolation.
Suitability depends on factors such as:
- Waste composition
- Geology
- Well design
- Injection-zone characteristics
- Regulatory requirements
- Available capacity
Underground injection contains PFAS rather than chemically destroying them. It can nevertheless isolate certain liquid wastes from drinking-water sources when performed through appropriately designed and regulated systems.
Can Heat Destroy PFAS?
Thermal destruction can break down certain PFAS-containing wastes under appropriate operating conditions.
But successful destruction depends on much more than simply reaching a high temperature.
Important factors include:
- Temperature
- Residence time
- Turbulence
- Oxygen availability
- Waste composition
- Combustion efficiency
- Emissions controls
Why Ordinary Incineration Is Not a Simple Answer
Not every furnace or waste incinerator operates under the same conditions.
A credible PFAS thermal-treatment program needs to consider whether:
- The target PFAS are destroyed
- Precursors are destroyed
- Other fluorinated compounds are formed
- PFAS appear in stack emissions
- PFAS remain in ash
- PFAS enter scrubber water
“High temperature” by itself does not prove complete PFAS destruction. The waste type, treatment system, operating conditions, emissions controls, analytical methods, and residual testing all matter.
How Do You Verify That PFAS Were Actually Destroyed?
This is technically difficult because measuring only a short list of PFAS can miss:
- PFAS precursors
- Short-chain transformation products
- Other fluorinated compounds
- Products of incomplete destruction
Evaluation may therefore involve combinations of:
- Targeted PFAS analysis
- Total or extractable organic fluorine measurements
- Stack-emission testing
- Residual analysis
- Mass-balance approaches
Emerging PFAS Destruction Technologies
Researchers are developing technologies intended to break carbon-fluorine bonds rather than simply separate PFAS from water.
Examples under research, demonstration, or limited deployment include:
- Supercritical water oxidation
- Hydrothermal alkaline treatment
- Electrochemical oxidation
- Plasma treatment
- Photochemical and reductive processes
- Mechanochemical treatment
These technologies can be promising, but each has practical questions involving:
- Scale
- Energy use
- Cost
- Corrosion
- Pretreatment
- Byproduct formation
- Ability to treat real-world waste mixtures
The key question is not simply whether PFAS concentrations decrease. A destruction process should demonstrate that fluorinated compounds are actually broken down rather than transformed into another persistent form.
PFAS and Wastewater Treatment Plants
Wastewater treatment plants can receive PFAS from many upstream sources.
These may include:
- Industrial facilities
- Homes and businesses
- Landfill leachate
- Firefighting-foam contamination
- Commercial finishing operations
- Contaminated groundwater remediation
Conventional municipal wastewater treatment plants were not originally designed specifically to destroy PFAS.
Depending on the particular PFAS and treatment process, chemicals may:
- Remain in treated wastewater
- Partition into sewage sludge
- Concentrate in treatment residuals
- Transform from precursor compounds into other measurable PFAS
See our Wastewater Treatment Guide.
PFAS in Sewage Sludge and Biosolids
Wastewater treatment separates solids from water.
The resulting material is generally referred to as sewage sludge.
Biosolids generally refers to treated sewage sludge that meets applicable requirements for its intended beneficial use.
PFAS in sewage sludge have become an important issue because land application can create potential pathways involving:
- Soil
- Groundwater
- Surface water
- Crops
- Livestock
EPA's 2026 Draft Biosolids Guidance
In July 2026, EPA released draft guidance addressing potential risk-reduction measures for PFOA and PFOS in sewage sludge and biosolids.
The recommendations are intended to help inform:
- Wastewater utilities
- State and Tribal agencies
- Landowners
- Farmers
- Other parties involved in biosolids management
The 2026 biosolids guidance is currently draft guidance, not a final nationwide biosolids rule. PFAS requirements can also differ significantly among states.
What Happens to PFAS Captured by Water Filters?
Several technologies can reduce selected PFAS in drinking water.
Common approaches include:
- Granular activated carbon
- Ion-exchange resin
- Reverse osmosis
These technologies generally separate PFAS from the treated water rather than destroy them.
Activated Carbon
PFAS adsorb onto carbon media.
The spent carbon eventually requires:
- Replacement
- Regeneration where applicable
- Appropriate disposal or further treatment
Ion Exchange
PFAS can bind to specialized resin.
The spent resin or regeneration waste must then be managed.
Reverse Osmosis
Reverse osmosis separates many PFAS into a concentrated reject stream.
This reduces PFAS in the treated water while creating a smaller volume of more concentrated wastewater.
This is why household filtration and PFAS disposal are related but separate issues. A filter can reduce exposure through drinking water while the broader waste system still has to manage the PFAS captured by that filter.
Why PFAS Can Create a Circular Waste Problem
A simplified PFAS cycle might look like this:
- A PFAS-containing product or contaminated waste enters a landfill.
- PFAS migrate into landfill leachate.
- The leachate is collected.
- It is sent to a wastewater treatment plant.
- Some PFAS remain in effluent, sludge, or treatment residuals.
- The residuals are landfilled, stored, treated, or land-applied where allowed.
- PFAS may again move into leachate, soil, surface water, or groundwater.
The same principle applies to drinking-water treatment:
water → filter media → spent filter → waste-management system
This is the central PFAS disposal problem: without effective destruction or secure long-term containment, a cleanup step may simply relocate the contamination.
Why Source Reduction Matters
Because PFAS are difficult and expensive to remove and destroy, preventing unnecessary PFAS from entering waste systems can be more efficient than treating contamination later.
Potential strategies include:
- Replacing PFAS where suitable alternatives exist
- Reducing unnecessary uses
- Controlling industrial discharges
- Separating highly contaminated waste streams
- Managing firefighting foams carefully
- Improving procurement policies
- Tracking PFAS-containing waste
Source control can be particularly valuable for wastewater utilities because preventing a high-concentration discharge from entering the sewer may be easier than removing the same PFAS after it has been diluted into millions of gallons of wastewater.
How Communities Are Responding
Responses depend on the source, concentration, location, available technology, and regulatory requirements.
Actions may include:
- Testing public drinking water
- Testing private wells in affected areas
- Identifying contamination sources
- Installing drinking-water treatment
- Controlling industrial discharges
- Monitoring landfill leachate
- Sampling wastewater and sludge
- Providing alternative water supplies where necessary
- Managing contaminated soil or firefighting foam
What Does PFAS Disposal Mean for Homeowners?
Most PFAS disposal decisions are handled by utilities, industries, waste facilities, regulators, and cleanup programs.
For homeowners, the more immediate question is usually whether PFAS are present in the drinking water.
If You Use Public Water
Check:
- Your Consumer Confidence Report
- Your utility's PFAS information
- State PFAS testing databases
- Local advisories
If You Use a Private Well
If PFAS contamination has been identified nearby, consider contacting your state or local environmental or health agency for guidance on appropriate testing.
PFAS laboratory testing requires specialized analytical methods and differs from ordinary home water test strips.
If You Choose a Filter
Evaluate:
- Which PFAS were tested
- Reduction percentage
- Influent concentration
- Filter capacity
- Flow rate or contact time
- Replacement schedule
The presence of activated carbon alone does not prove that a finished filter will provide the same PFAS performance as another carbon filter. Review product-specific PFAS testing or certification.
Where Do Berkey® Filters Fit?
Berkey® water filter systems are gravity-fed countertop systems.
For PFAS concerns, contaminant reduction depends on the specific installed filter element and its current test data, not simply the stainless-steel chamber.
Independent laboratory testing has reported reduction of selected perfluorinated compounds by certain Berkey® filter elements under the stated test conditions.
For current information, review:
A drinking-water filter addresses exposure at the faucet; it does not solve the larger PFAS disposal problem. The captured PFAS ultimately becomes part of the spent-media waste stream.
Frequently Asked Questions About PFAS Disposal
Why are PFAS called forever chemicals?
Many PFAS break down extremely slowly because of their chemical structure, allowing them to persist in the environment for long periods.
Does filtering water destroy PFAS?
Usually not. Activated carbon, ion exchange, and reverse osmosis generally separate PFAS from drinking water and transfer them into another waste stream.
What happens to PFAS captured by activated carbon?
The PFAS remain associated with the spent carbon until the media is regenerated, treated, or disposed of through an appropriate waste-management process.
Does reverse osmosis destroy PFAS?
No. Reverse osmosis generally moves PFAS into the concentrated reject stream while producing lower-PFAS treated water.
Can PFAS be destroyed?
Some PFAS-containing wastes can be destroyed using appropriately designed thermal or emerging treatment processes, but effectiveness depends on the PFAS, waste type, operating conditions, and verification methods.
Can PFAS be incinerated?
Certain controlled thermal treatment systems may destroy selected PFAS waste streams. Complete destruction should not be assumed for every incinerator or operating condition.
Do landfills destroy PFAS?
No. Landfills primarily contain PFAS-containing waste rather than chemically destroying the PFAS.
Can PFAS leak from landfills?
PFAS can migrate into landfill leachate. Modern engineered landfills use liners, collection systems, and monitoring to control releases, but the collected leachate still requires management.
What happens when landfill leachate is sent to a wastewater plant?
Conventional wastewater treatment may not destroy the PFAS. Some can remain in treated effluent, sewage sludge, or other residual streams.
Do wastewater treatment plants remove PFAS?
Results vary by PFAS and treatment process. Conventional municipal wastewater plants were not designed specifically to destroy PFAS.
Can PFAS end up in biosolids?
Yes. Some PFAS can partition into sewage sludge during wastewater treatment and may therefore be present in biosolids.
Has EPA banned land application of PFAS-containing biosolids nationwide?
No. EPA released draft guidance on PFOA and PFOS in biosolids in 2026, but requirements and restrictions continue to vary by jurisdiction.
What is underground injection?
For appropriate liquid wastes, underground injection places waste into deep permitted geological formations intended to isolate it from underground sources of drinking water.
Does underground injection destroy PFAS?
No. It is primarily a containment method.
What technologies are being developed to destroy PFAS?
Research includes supercritical water oxidation, hydrothermal alkaline treatment, electrochemical oxidation, plasma, photochemical processes, and mechanochemical treatment.
Why is PFAS source reduction important?
Preventing unnecessary PFAS use and industrial releases can reduce the amount of contaminated water, sludge, soil, filter media, and waste that must eventually be treated or disposed of.
Can household water filters reduce PFAS exposure?
Some filters can reduce selected PFAS. Performance depends on the filter design, media, water chemistry, PFAS type, capacity, and maintenance.
Does activated carbon always remove PFAS?
No. Performance varies among PFAS and among finished carbon filters. Product-specific testing is more useful than assuming all activated-carbon filters perform equally.
Final Thoughts
PFAS disposal is difficult because the chemicals can repeatedly move from one environmental or waste stream to another.
A successful PFAS strategy must distinguish between three very different outcomes:
- Removal: taking PFAS out of water or another medium
- Containment: isolating PFAS so they are less likely to reach people or the environment
- Destruction: breaking PFAS chemistry down sufficiently that the original persistent compounds no longer remain
Activated carbon can remove PFAS from water.
A landfill may contain PFAS-containing waste.
Certain thermal or emerging technologies may destroy PFAS under appropriate conditions.
Those are not interchangeable outcomes.
The long-term goal is to avoid simply passing PFAS from one system to another. Source reduction, careful waste management, effective containment, verified destruction where appropriate, and ongoing monitoring all have roles in managing the PFAS lifecycle.