Practical guide
How to Remove PFAS from Water: Filters That Work in 2026
To remove PFAS from drinking water, you need a filter certified to reduce these chemicals, not just any water filter. The most reliable options are reverse osmosis systems and activated carbon filters that meet NSF/ANSI 53 or 58 standards for PFOA and PFOS. Pitcher filters like ZeroWater and Clearly Filtered can work if they carry the right certification, but standard carbon pitchers often do not.
This guide explains what PFAS are, which technologies actually reduce them, and how to choose a filter based on your water source, budget, and installation preferences. We also address common questions like whether ZeroWater or PUR removes PFAS, and we highlight the importance of checking certifications before buying.
Start by testing your water to know which PFAS are present and at what levels. Then match the filter technology to your needs, and always verify that the product is certified for PFAS reduction. This approach ensures you invest in a solution that works, not just one that claims to.
Buying framework
How to compare the options
| Criterion | Why it matters | What to choose | Watch for |
|---|---|---|---|
| Water source | Municipal and well water have different contamination risks and treatment needs. | If you have municipal water, check your annual water quality report for PFAS. If you have well water, test for PFAS specifically. | Do not assume your water is free of PFAS; testing is the only way to know. |
| PFAS levels and types | Different PFAS compounds may require different treatment technologies. | Test for PFOA, PFOS, and other PFAS to determine the right filter. | Some filters reduce only PFOA/PFOS, not all PFAS. |
| Budget | Initial and ongoing costs vary widely between filter types. | If budget is tight, consider a certified pitcher like ZeroWater or Clearly Filtered. | Cheaper filters may not be certified for PFAS, so verify before buying. |
| Installation space and plumbing | Under-sink and whole-house systems require space and sometimes professional installation. | If you rent or lack space, choose a pitcher or faucet-mounted filter. | Under-sink RO systems need a dedicated faucet and drain connection. |
| Daily water consumption | Higher usage requires a filter with larger capacity or faster flow. | For large families, consider an under-sink RO or a larger countertop system. | Pitchers have limited capacity and may need frequent refills. |
| Certification | NSF/ANSI 53 or 58 certification ensures the filter is tested to reduce PFAS. | Look for explicit certification for PFOA/PFOS on the product. | Do not rely on vague claims like 'reduces contaminants.' |
| Filter replacement cost and availability | Ongoing costs and ease of finding replacements affect long-term usability. | Choose a brand with readily available and reasonably priced replacement filters. | Some proprietary filters are expensive and hard to find. |
What Are PFAS and Why Do They Matter?
PFAS, or per- and polyfluoroalkyl substances, are a group of thousands of man-made chemicals used in non-stick cookware, waterproof clothing, firefighting foam, and many other products. They are called 'forever chemicals' because they do not break down in the environment and can accumulate in the human body.
Exposure to certain PFAS, particularly PFOA and PFOS, has been linked to health effects such as increased cholesterol, immune system impacts, and certain cancers. The EPA has set health advisories for these compounds, but they are not yet regulated in all water systems.
Because PFAS are widespread and persistent, many people choose to filter them from their drinking water. Understanding what they are helps you make informed decisions about treatment.
Do Water Filters Remove PFAS?
Not all water filters remove PFAS. The effectiveness depends on the filtration technology and whether the filter is certified for PFAS reduction. Standard sediment filters and basic carbon filters are not designed to remove PFAS.
Technologies that can reduce PFAS include reverse osmosis, activated carbon adsorption, and anion exchange. However, even within these categories, not every product is certified. Always check for NSF/ANSI 53 or 58 certification specifically for PFOA/PFOS.
For example, many pitcher filters like Brita are not certified for PFAS, while ZeroWater and Clearly Filtered have been tested to reduce them. But certification is key, not just brand reputation.
What Water Filter Removes PFAS?
Reverse osmosis (RO) systems are generally the most effective for PFAS removal, often reducing them by more than 90%. They work by forcing water through a semi-permeable membrane that blocks contaminants, including PFAS. RO systems are typically installed under the sink and require a drain line.
Activated carbon filters that are certified to NSF/ANSI 53 for PFOA/PFOS are also effective. These filters use carbon to adsorb PFAS molecules. They come in various forms, including pitchers, faucet-mounted, and under-sink units.
Anion exchange is another option, often used in whole-house systems. It works by exchanging ions to remove negatively charged PFAS. This technology can be effective but may be more expensive and require professional installation.
When choosing a filter, prioritize those with explicit certification for PFAS reduction. This ensures the product has been tested by an independent body.
Does ZeroWater Remove PFAS?
Yes, ZeroWater filters are tested to reduce PFAS, including PFOA and PFOS. They use a five-stage filtration process that includes activated carbon and ion exchange, which can remove these chemicals. ZeroWater pitchers also come with a TDS meter to indicate when the filter needs replacement.
However, not all ZeroWater models may have the same certifications. Check the specific product's documentation for NSF/ANSI 53 certification for PFAS. The filter replacement frequency depends on your water quality; the TDS meter reading of 006 indicates it's time to change the filter.
ZeroWater is a good choice for renters or those who want a simple, countertop solution. But it may not be ideal for large households due to its limited capacity.
Does Clearly Filtered Remove PFAS?
Clearly Filtered pitchers use a proprietary filtration media that is tested to reduce PFAS, among many other contaminants. They are certified to NSF/ANSI 53 for PFOA/PFOS reduction, making them a reliable pitcher option.
Clearly Filtered stands out for its high contaminant reduction, but it comes at a higher price point than standard pitchers. The filters last longer than many competitors, which can offset the initial cost.
If you prefer a pitcher but want certified PFAS removal, Clearly Filtered is a strong choice. However, it may not be suitable for those on a tight budget.
Does PUR Remove PFAS?
Some PUR filters are certified to reduce PFAS, but not all. PUR offers a range of filters, and only those with NSF/ANSI 53 certification for PFOA/PFOS are effective. Check the product label or PUR's website to confirm certification.
PUR filters are widely available and affordable, making them a convenient option. However, if you need PFAS removal, you must select the specific certified model, not just any PUR filter.
For example, PUR's basic carbon filters may not reduce PFAS, while their advanced filters with certification do. Always verify before purchasing.
How to Choose a PFAS Filter
Start by testing your water to know which PFAS are present and at what levels. You can use a certified lab or a home test kit. This information guides your filter choice.
Next, decide on the filtration technology based on your needs. If you want maximum removal, choose an RO system. If you prefer a simpler solution, look for a certified carbon pitcher like ZeroWater or Clearly Filtered.
Consider your budget, including initial cost and replacement filters. RO systems have higher upfront costs but lower per-gallon costs over time. Pitchers are cheaper initially but require frequent filter changes.
Finally, check the certification. Look for NSF/ANSI 53 or 58 certification for PFOA/PFOS on the product. This is the most reliable indicator of effectiveness.
Installation and Maintenance Tips
Installation varies by filter type. Pitchers require no installation, while faucet-mounted filters attach directly to the tap. Under-sink RO systems need a dedicated faucet and drain connection, which may require professional help.
Maintenance is crucial for PFAS filters to work effectively. Replace filters according to the manufacturer's schedule. For ZeroWater, use the TDS meter to know when to change. For other filters, follow the recommended timeline, typically every 3-6 months.
Regularly clean the system components to prevent bacterial growth. For RO systems, sanitize the tank and lines periodically. Proper maintenance ensures your filter continues to reduce PFAS.
Limitations and Mistakes to Avoid
One common mistake is assuming any filter removes PFAS. Many filters are not certified for PFAS and may not reduce them at all. Always check for certification.
Another mistake is ignoring maintenance. A clogged or expired filter can become ineffective and may even release contaminants. Follow the replacement schedule.
Also, do not rely on boiling water to remove PFAS. Boiling does not remove these chemicals and can actually concentrate them. Filtration is the only effective method.
Finally, be aware that no filter targets only the contaminants identified in the exact model evidence. PFAS reduction is specific, so choose a filter that targets the PFAS you are concerned about.
Common questions
Frequently asked questions
Do Brita filters remove PFAS?
Standard Brita filters are not certified to remove PFAS. Brita's basic carbon filters are designed for taste and odor reduction, not PFAS. If you need PFAS removal, look for a filter with NSF/ANSI 53 or 58 certification for PFOA/PFOS, or consider reverse osmosis.
What is the best whole-house filter for PFAS?
Whole-house filters for PFAS are less common and often expensive. Look for a whole-house system that uses activated carbon or anion exchange and is certified for PFAS reduction. Reverse osmosis is typically installed at the point of use, not whole-house, due to cost and water waste.
Can boiling water remove PFAS?
No, boiling water does not remove PFAS. In fact, boiling can concentrate PFAS as water evaporates. Filtration is the only effective way to reduce PFAS in drinking water.
How often should I replace my PFAS filter?
Replacement frequency depends on the filter type and your water usage. Follow the manufacturer's recommendations. For example, ZeroWater filters need replacement when the TDS meter reads 006, while other filters may last 3-6 months. Regular replacement is essential to maintain effectiveness.
Are there any health risks from PFAS in water?
Exposure to certain PFAS has been linked to health effects, including increased cholesterol, immune system impacts, and certain cancers. The EPA has established health advisories for PFOA and PFOS. Reducing exposure through filtration is a prudent step, but consult health professionals for specific concerns.
Summary
What to remember
Removing PFAS from your water requires a filter that is certified to reduce these chemicals. Reverse osmosis systems offer the highest removal, while certified activated carbon pitchers like ZeroWater and Clearly Filtered provide a convenient and effective alternative. Always check for NSF/ANSI 53 or 58 certification for PFOA/PFOS before purchasing.
Test your water, consider your budget and installation preferences, and maintain your filter regularly to ensure it continues to work. Avoid non-certified filters and remember that boiling does not remove PFAS.
For most households, a certified pitcher is a good starting point, but if you want maximum protection, invest in an under-sink RO system. Choose the option that fits your needs and take action to reduce your exposure.
