Water filters for PFAS: what the EPA says to look for on a pitcher, faucet or whole-home filter

A home water filter could be an effective way to reduce PFAS in drinking water, the Environmental Protection Agency says, but not every filter addresses them. That is the core of the EPA's fact sheet on home filters, written as of April 2024 and still linked from its PFAS drinking water page. It tells buyers to look for certification to NSF/ANSI 53 or NSF/ANSI 58 for PFAS reduction, and to check their water's test results first. This guide sets that advice beside the EPA's final national data on PFAS in tap water, published in July 2026.

What the EPA says to check first

The EPA's first step is information, not hardware. It suggests asking your local water provider which PFAS, if any, are in your water, or searching the EPA's database of water system test results or its map-based PFAS Analytic Tools. State environmental or health agencies may also have more information and recommendations, it adds. “If PFAS have not been measured in your water, or if PFAS have been measured but are below federal limits, a filter may not be useful to you,” the fact sheet says.

The EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) data, now final, give a national picture. They cover about 10,130 public water systems with a full set of results from about 25,950 sampling locations. The EPA compared averages from those results with the limits it set in April 2024, while stressing that the comparison does not show whether a system complies. By that measure, 15.5% of large systems serving more than 10,000 people, 8.3% of systems serving 3,300 to 10,000 and 7.1% of smaller systems in the sample had an average above at least one limit. Weighted to reflect all systems nationwide, the EPA's estimate is 7.8%.

For the other four limits in the 2024 rule, on PFHxS, PFNA, HFPO-DA (known as GenX) and the Hazard Index for mixtures, the shares were 1.1% or lower in every size group. By our reading of the table, PFOA and PFOS, the two chemicals that the EPA says filter certifications focus on, are also the two most often found above the limits. The data also show that PFAS tend to occur together: at 66% of sampling locations with at least one PFAS at or above the reporting level, more than one PFAS was at or above it.

The limits themselves are in flux. In May 2026 the EPA proposed keeping the 4.0 parts per trillion limits for PFOA and PFOS, with an option for water systems to seek two more years, to 2031, to comply, and proposed rescinding the limits for the other four. Its rule page, last updated on May 18, 2026, presents both as proposals, and a Federal Register search on November 13, 2026 showed no final rule on either.

The three filter types the EPA names

Prices vary widely. The EPA puts the range at as little as $20 to more than $1,000, before maintenance, depending on the type and brand and on whether the filter is a pitcher, sits on a faucet or serves the whole home. Maintenance and disposal costs vary too.

What the certification on the box means

Certification by an independent body is, in the EPA's words, “an assurance that the filter works as the manufacturer says it does.” The fact sheet tells buyers to check the packaging for certification to NSF/ANSI 53 or NSF/ANSI 58 for PFAS reduction, and notes that a filter's PFAS claims may also appear in a performance data sheet inside the package or on the maker's website. Five certification bodies accredited by the American National Standards Institute (ANSI) evaluate filters for PFAS reduction, each with its own registered mark and an online product directory where a model can be looked up: CSA Group, IAPMO R&T, NSF, UL and WQA. If doubt remains, the EPA suggests contacting the certification body directly.

There is a gap the fact sheet spells out. As of April 2024, it says, filter certifications focus on PFOA and PFOS, and the current standards do “not yet indicate that a filter will remove PFAS down to the levels EPA has now set for a drinking water standard.” The EPA said it was working with standard-setting bodies to update the certifications. In the meantime, it said, reducing PFAS levels in your water is still an effective way to limit exposure.

Why the EPA stresses upkeep

The EPA's last point is about upkeep. A filter is effective only when it is maintained as the manufacturer instructs, the fact sheet says, and failing to replace it on the recommended schedule can increase the risk of PFAS exposure. Its $20-to-$1,000 price range leaves out maintenance, which it says varies between filters. For other kitchen products touched by PFAS rules, see our guide to the state bans on PFAS in cookware.