Do Water Filters Remove PFAS?
Do water filters remove PFAS? Some water filters can reduce certain PFAS chemicals, but not every filter is designed or certified to do so. Activated-carbon filters and reverse-osmosis systems may reduce PFAS when properly selected and maintained, but you must verify the exact model’s PFAS reduction claim.
Quick Answer
Certain water filters certified under NSF/ANSI 53 or NSF/ANSI 58 with a specific PFAS reduction claim can help reduce PFAS in drinking water.
Do not assume that an ordinary pitcher, refrigerator filter, carbon cartridge, or reverse-osmosis system reduces PFAS. Check the certification and performance information for the exact model before purchasing.
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What Are PFAS?
PFAS stands for per- and polyfluoroalkyl substances. They are a large group of human-made chemicals that have been used in consumer products and industrial applications for decades.
They have been used in products designed to resist water, grease, stains, and heat. PFAS may be found in food packaging, stain-resistant materials, firefighting foam, manufacturing processes, and other products.
Some PFAS break down extremely slowly and can remain in the environment for a long time. This persistence has led to their common description as “forever chemicals.”
Scientific studies indicate that exposure to certain PFAS may be associated with harmful health effects. However, PFAS includes thousands of different chemicals, and knowledge about them continues to develop. The EPA provides current information about PFAS and ongoing research.
Find Out Whether PFAS Are in Your Water
Before buying a filter, determine whether PFAS have been detected in your water supply.
Municipal-water customers can start by reviewing their utility’s annual Consumer Confidence Report. If PFAS information is not listed, contact the water provider and ask whether the water has been tested and where the latest results can be found.
Private-well owners are responsible for testing their water. PFAS testing generally requires a qualified laboratory and careful sampling procedures. Contact your state environmental agency, local health department, or an accredited laboratory for guidance.
Read How to Test Your Water Before Buying a Filter before choosing any treatment system.
Which Water Filters Can Reduce PFAS?
Two common household treatment methods may reduce certain PFAS:
Activated-Carbon Filters
Activated carbon can capture certain PFAS through adsorption, which causes the chemicals to collect on the carbon’s surface.
Carbon filtration is available in several forms, including:
- Water-filter pitchers
- Faucet-mounted filters
- Refrigerator filters
- Countertop systems
- Under-sink filters
- Larger point-of-entry systems
Performance varies according to the type and amount of carbon, the PFAS involved, water conditions, flow rate, and cartridge condition. Longer-chain PFAS are generally easier for activated carbon to capture than some shorter-chain PFAS.
A filter containing activated carbon is not automatically certified to reduce PFAS. Look for a specific PFAS reduction claim for the exact model.
Compare home water filtration systems
Reverse-Osmosis Systems
Reverse osmosis forces water through a semipermeable membrane. Residential RO systems normally include sediment and carbon filters in addition to the membrane.
Reverse osmosis can be effective at reducing several PFAS compounds, but performance depends on the exact system, membrane, water conditions, installation, and maintenance.
RO systems also require sufficient cabinet space, replacement filters and membranes, a drain connection, and produce a reject-water stream.
Read Reverse Osmosis vs. Whole-House Filtration: Which Do You Need? before choosing an RO system.
Compare under-sink reverse-osmosis options
Check the Exact Certification
Certification is one of the most important considerations when shopping for a PFAS water filter.
Look for:
- NSF/ANSI 53 with a specific PFAS reduction claim for a filtration system
- NSF/ANSI 58 with a specific PFAS reduction claim for a reverse-osmosis system
- The exact manufacturer and model number
- PFAS, PFOA, PFOS, or other applicable claims listed in the product documentation
- The filter’s rated capacity and replacement schedule
A product’s general certification to NSF/ANSI 53 or 58 does not necessarily mean it has been certified for PFAS reduction. Certification must include the relevant contaminant claim.
You can verify models using the NSF Certified Drinking Water Treatment Units database. NSF explains that filters carrying an applicable PFAS designation under NSF/ANSI 53 or 58 can help reduce PFAS, but certification requirements continue to evolve alongside federal standards. Read NSF’s PFAS filtration guidance.
Replace the Filter on Schedule
A PFAS filter cannot work properly indefinitely. As a cartridge reaches its rated capacity, its ability to reduce contaminants may decline.
Follow the manufacturer’s instructions for:
- Cartridge and membrane replacement
- Maximum rated capacity
- Acceptable flow rate
- Incoming water conditions
- Cleaning and sanitizing
- Proper installation
- Retesting treated water when appropriate
Do not continue using a cartridge beyond its recommended service life simply because the water still tastes normal. PFAS cannot be detected through taste, smell, or appearance.
Do Whole-House Filters Remove PFAS?
Some point-of-entry systems may reduce PFAS, but an ordinary whole-house sediment or chlorine filter should not be assumed to do so.
A whole-house PFAS treatment system requires appropriate media, sufficient contact time, proper flow capacity, and regular maintenance. It must also handle the household’s peak water demand.
Whole-house treatment may be appropriate when testing and professional evaluation support it. However, some households may choose a certified point-of-use filter at the kitchen sink for drinking and cooking water.
Read our Whole-House Water Filters guide before comparing point-of-entry equipment.
What Does Not Reliably Remove PFAS?
Do not rely on the following unless the exact treatment system carries an appropriate verified PFAS reduction claim:
- Ordinary sediment filters
- Water softeners
- Ultraviolet lights
- Standard chlorine treatment
- Uncertified carbon cartridges
- Boiling water
Boiling is not a recommended way to remove PFAS. Because water evaporates while PFAS remain, boiling may increase the concentration in the water left behind.
Final Thoughts
Some water filters remove or reduce certain PFAS, but filter type alone is not enough to guarantee performance.
Begin by checking your municipal water report or arranging qualified laboratory testing. Then select an exact model carrying a verified PFAS reduction claim, install it correctly, and replace its filters or membranes on schedule.
Do not choose a product merely because its advertising mentions activated carbon, reverse osmosis, or NSF standards. Confirm that the specific model and certification include PFAS reduction.
Water conditions and PFAS regulations can change. This educational article does not replace laboratory testing, local health guidance, or advice from qualified water-treatment professionals.