Filters for Forever Chemicals: What to Look For

The certificate must name PFOA and PFOS. “PFAS” on the box isn’t enough.

PFAS, the “forever chemicals”, are best reduced at home by a filter certified for PFOA and PFOS: either reverse osmosis or certified activated carbon. Check that the certification names those compounds for the exact model; the word “PFAS” on a box isn’t enough. A filter at your kitchen tap covers the water you drink and cook with.

See the options Check my water

Why PFAS matter in tap water

They usually come with the water, not from your pipes

PFAS are a family of man-made chemicals used in non-stick, stain-resistant and waterproof products and in firefighting foam. They break down very slowly, so they build up in water and in people.

The federal limits and their status are listed below. Compliance with the 2024 limits is judged on a running annual average, with a compliance date of 2029 (EPA has proposed allowing until 2031 for PFOA and PFOS).

Products and foamWhere PFAS start
Non-stick, stain-resistant and waterproof products, and firefighting foam.
Rivers and groundwaterPFAS enter here
PFAS break down very slowly, so they build up.
Treatment plantIn the record
What your water record measures.
Your home’s pipesLittle change
Home plumbing isn’t a usual source of PFAS.
Your tapFilter here
A certified filter here covers what you drink and cook with.

What to look for on the box

Four checks before you buy

Look up the exact model in the free NSF, WQA or IAPMO online listings.

How to read a certification →

NSF/ANSI 53 or 58, naming PFOA and PFOS

NSF/ANSI 53 or 58, with PFOA and PFOS named.

The exact model

The exact model on the certificate, in the free NSF, WQA or IAPMO online listings.

Capacity and schedule

The certified capacity in gallons, and the cartridge schedule.

Not the same as certified

Caution with “removes PFAS” claims that have no certificate, or “tested to NSF standards”.

The three technologies that work

Three technologies, then the cost

Some pitchers and faucet filters are certified for a combined “total PFAS” measure rather than for PFOA and PFOS by name. Check what the certificate lists.

NSF/ANSI 53 or 58

Reverse osmosis

A very fine membrane holds back PFAS and other contaminants. Certified models commonly cover PFOA, PFOS and lead (check the listing for arsenic or nitrate). The broadest option, but it sends some water to the drain.

Reduces: PFAS + more
Water to drain: Some
Cost: Higher
Install: Under-sink or countertop

NSF/ANSI 53

Activated carbon

Certified carbon blocks trap PFOA and PFOS as water passes through. Cheaper and no wastewater, but the cartridge must be changed on time.

Reduces: PFOA, PFOS
Water to drain: None
Cost: Lower
Watch: Cartridge schedule

Listing-specific

Anion exchange

Special resin beads that grab PFAS. Mostly used in whole-house and larger systems.

Reduces: PFAS
Used in: Whole-house
Cost: Higher
Certified: Check listing

Running cost

What it costs to own

Certified carbon filters cost less than reverse osmosis, both to buy and to run. With either, the ongoing cost is replacement cartridges, which must be changed on time for the filter to keep working, so check their price before you choose.

Carbon: Lower
RO: Higher
Ongoing: Cartridges
Change: On time

Federal PFAS limits

EPA’s 2024 drinking-water rule, and what EPA proposed in May 2026. Until a final rule, all five limits apply.

PFOA4.0 ng/LProposed to keep
PFOS4.0 ng/LProposed to keep
PFHxS10 ng/LProposed to rescind
PFNA10 ng/LProposed to rescind
HFPO-DA (GenX)10 ng/LProposed to rescind

The 2024 rule also set a Hazard Index of 1 for mixtures of two or more of PFHxS, PFNA, GenX and PFBS; EPA has proposed rescinding it, and it applies until a final rule.

Good for

Homes where a water record shows PFOA or PFOS
Homes near airports, military bases or factories that used PFAS
Renters who want a certified option without plumbing

Not the right fit for

Hard-water scale→ that’s a softener’s job
Buying blind: no PFAS result on record can mean it wasn’t tested, not that it’s absent→ check your record; on a well, test it

Before you buy, check what is in your water. Your water system’s record shows which contaminants have been found, so you only pay for treatment you need.

Check my water →

Commercial · filters for PFOA and PFOS we trackWe may earn a commission

Filters for PFOA and PFOS we track

Each card shows whether the model is certified for PFOA and PFOS. Open a product to see its certificate. Some links are affiliate links: PurityMap may earn from qualifying purchases, at no extra cost to you.