If you've seen the term "forever chemicals" in the news and wondered whether your tap water is affected, you're not alone. PFAS contamination has become one of the most significant public health stories of the past decade -- and whether it affects your water may surprise you.
What Are PFAS?
PFAS stands for per- and polyfluoroalkyl substances -- a group of more than 15,000 synthetic chemicals used in manufacturing since the 1940s. They're called "forever chemicals" because the carbon-fluorine bonds that make them so chemically stable also make them extraordinarily resistant to breaking down. Once PFAS enter the environment, they persist for decades.
These chemicals are or have been used in non-stick cookware coatings (Teflon and similar), stain-resistant fabric treatments (Scotchgard, Gore-Tex), food packaging and grease-resistant wrappers, firefighting foam (AFFF) heavily used at military bases and airports, and industrial processes across dozens of industries.
When products containing PFAS are manufactured, used, or disposed of, the chemicals leach into soil and groundwater -- and from there, into drinking water supplies.
How Common Is PFAS Contamination in US Drinking Water?
More common than most people realize. Testing data from the EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) has identified over 9,700 contaminated sites across all 50 states, with an estimated 176 million Americans served by water systems that have detected PFAS. The states with the highest number of systems exceeding EPA limits include New Jersey, Massachusetts, California, New Hampshire, and Pennsylvania -- though detections have been recorded in virtually every state.
You can check the EWG's interactive contamination map at ewg.org/interactive-maps/pfas_contamination.
Are PFAS Dangerous?
Yes. Chronic exposure to PFAS is associated with serious health risks, especially at elevated levels over long periods. The major areas of concern include certain cancers (particularly kidney and testicular cancer), immune system suppression including reduced vaccine response, thyroid disease and hormone disruption, liver toxicity and elevated cholesterol, developmental effects including lower birth weight, and cardiovascular associations.
The EPA's own toxicological review concluded that PFOA and PFOS -- the two most-studied PFAS -- have no known safe level of exposure, setting the Maximum Contaminant Level Goal (MCLG) for both at zero.
What Are the Legal Limits?
In April 2024, the EPA finalized its first-ever national drinking water standards for PFAS. PFOA and PFOS are limited to 4 parts per trillion (ppt) each. PFNA, PFHxS, and HFPO-DA (GenX) are limited to 10 ppt each.
In May 2025, the EPA announced it would retain the PFOA and PFOS standards but planned to rescind limits for the other four compounds, and extended the compliance deadline to 2031. This means utilities aren't required to treat until levels exceed the legal limits -- and with compliance years away, many households with detectable PFAS will remain exposed in the interim. "Legal" and "health-protective" are not the same standard.
How Do I Know If My Water Has PFAS?
Check your utility's Consumer Confidence Report (CCR). Every public water system must publish an annual CCR with PFAS testing results. Search yours at the EPA's CCR tool.
Use the EWG Tap Water Database. EWG compiles utility testing data searchable by ZIP code at ewg.org/tapwater. It often flags contaminants at levels below EPA legal limits but above health guidelines.
Check your ZIP at PureCity. We compile regional water quality data and give you a plain-language profile of what's most likely in your area, including whether PFAS is flagged as a concern. Enter your ZIP here.
Get your water tested directly. PFAS cannot be detected with DIY test strips -- it requires a certified laboratory. If your area has a known contamination history or your ZIP shows elevated PFAS risk, a dedicated lab test tells you your actual concentration before you invest in filtration. The Safe Home PFAS Test Kit is a full lab scan for 12 PFAS compounds including PFOA and PFOS, certified in all 50 states. See our complete guide to water testing for more detail on when PFAS testing is worth doing.
Can You Filter PFAS Out at Home?
Yes -- but not all filters are effective. The EPA identifies four Best Available Technologies for PFAS removal: reverse osmosis (RO), nanofiltration, granular activated carbon (GAC), and anion exchange resin.
Reverse osmosis is the gold standard for home use. RO systems force water through a semi-permeable membrane, achieving 94--99% removal across both long-chain and short-chain PFAS -- including the newer short-chain varieties that activated carbon handles less reliably.
When shopping for an RO system, look for NSF/ANSI 58 certification with a specific PFAS reduction claim on the product listing, not just marketing copy. See the EPA's guide to certified PFAS-reducing filters.
Standard pitcher filters using activated carbon are not reliably effective against PFAS, particularly short-chain compounds. The Clearly Filtered pitcher is the exception -- independently certified under NSF 473 for PFAS reduction, making it the only mainstream pitcher with a verified PFAS claim.
Filters That Remove PFAS
- ✓NSF 58 certified; removes PFAS at 94-99% across both long-chain and short-chain compounds
- ✓WQA Gold Seal; made in USA; the benchmark under-sink RO for over a decade
- ✓Also removes lead, nitrates, arsenic, fluoride, and DBPs -- the most common PFAS co-contaminants
- ✓~$50-70/year in replacement filters
- Kitchen tap only -- whole-house PFAS treatment requires GAC or anion exchange at utility scale
- 4:1 waste water ratio
- Requires one drilled faucet hole and cold water line connection
The standard recommendation for homeowners with PFAS concerns. NSF 58 certified, one system addresses PFAS plus every other common drinking water contaminant simultaneously.
- ✓Same 94-99% PFAS removal as standard RO
- ✓6th alkaline stage restores minerals after RO -- noticeably better taste than flat RO water
- ✓NSF 58 and 372 certified; WQA certified
- ✓Good for households in high-PFAS cities who drink heavily from the filtered tap
- Slightly larger footprint than the APEC
- Higher price than the APEC ROES-50
- 4:1 waste water ratio
The upgrade pick when taste matters. PFAS removal is equivalent to the APEC -- the difference is the remineralization stage that makes filtered water noticeably more pleasant to drink daily.
- ✓Tankless design -- fits under sinks where traditional RO systems won't
- ✓NSF 42/53/58/372 certified; strong PFAS removal
- ✓1.5:1 waste water ratio vs. 4:1 for traditional systems
- ✓Smart display shows filter life and TDS in real time
- Proprietary filter cartridges -- locked into Waterdrop replacements
- Higher price than the APEC
- Thinner long-term track record than APEC or iSpring
The right pick if under-sink cabinet space is the constraint. Equivalent PFAS removal to the APEC in a compact form factor -- go in understanding the filter lock-in.
- ✓Full RO PFAS removal without any plumbing or drilling
- ✓5-stage RO also removes lead, nitrates, fluoride, arsenic, and chromium-6
- ✓3:1 pure-to-drain ratio -- more efficient than traditional RO systems
- ✓Portable -- ideal for renters in PFAS-affected cities like San Diego or Colorado Springs
- Filters into a reservoir -- not on-demand tap flow
- Takes up counter space
- Does not remineralize
For renters who can't install under-sink systems. Provides the same RO-level PFAS removal in a completely portable format. Particularly relevant for renters near military bases, airports, or industrial corridors with confirmed PFAS issues.
- ✓The only mainstream pitcher independently certified for PFAS reduction (NSF 473)
- ✓Also certified for lead (NSF 53), fluoride (NSF 244), chloramine, and 360+ contaminants
- ✓No installation required -- the best no-install option for renters with PFAS concerns
- ✓Lower cost than countertop RO
- Does not achieve RO-level PFAS removal -- pitcher filtration is less thorough than membrane RO
- Slow -- around 10 minutes to filter a full pitcher
- Does not remove nitrates
The best no-install, no-cost-of-entry option for renters or households where RO isn't feasible. A meaningful upgrade over any standard carbon pitcher -- the only one with a verified PFAS certification. Upgrade to countertop or under-sink RO for more comprehensive coverage.
Frequently Asked Questions
Does boiling water remove PFAS? No. Boiling concentrates PFAS -- the water evaporates but the chemicals remain. Boiling is useful for biological contaminants but does nothing for chemical contamination.
Do refrigerator filters remove PFAS? Most do not. Standard refrigerator filters are typically certified only to NSF/ANSI 42 or 53 and very few carry specific PFAS certifications. Check the exact NSF certification before relying on one.
Is bottled water PFAS-free? Not necessarily. Some bottled water brands have tested positive for PFAS, particularly those sourced from municipal water systems. A certified home RO system is generally more reliable and far less expensive over time.
My utility says its water is "in compliance." Do I still need to worry? Legal compliance means levels are below the EPA's enforceable limits -- but the EPA's own health-based goals for PFOA and PFOS are zero. "Legal" and "health-protective" are not the same standard. With the compliance deadline extended to 2031, many households with detectable PFAS will remain exposed for years before utilities are required to treat.
The Bottom Line
PFAS contamination is widespread, the health evidence is serious, and the regulatory timeline means millions of people will continue to have detectable levels in their water for years before utilities are required to treat. The at-home solution is well-understood and within reach for most households.
If PFAS are flagged as a concern in your area, an NSF/ANSI 58-certified reverse osmosis system is the most effective single step you can take. Check your ZIP code at PureCity to see whether PFAS is a concern where you live.
Related Articles
- How to Test Your Home's Drinking Water
- Best Under-Sink Reverse Osmosis Systems
- Microplastics in Drinking Water
Sources: EPA -- PFAS National Primary Drinking Water Regulation · EPA -- Identifying Drinking Water Filters Certified to Reduce PFAS · Federal Register -- PFAS NPDWR Final Rule (April 2024) · EWG -- PFAS Contamination Interactive Map · NSF -- ANSI/NSF 58 Standard