PFAS Reduction

Activated carbon, reverse osmosis, and ion exchange are the main certified approaches for reducing PFAS at home.

Short answer: Look for NSF/ANSI 53, 58, or 401 certification specifically listing the PFAS compounds you're concerned about, follow manufacturer maintenance schedules closely, and confirm your public-water or private-well PFAS levels before choosing treatment. See PFAS in Delaware Public Water for context.

Main treatment approaches

Activated carbon: effective for many PFAS compounds when properly sized and maintained; requires monitoring for breakthrough as the media saturates.
Reverse osmosis: effective for a broad range of PFAS when certified; see Reverse Osmosis.
Ion exchange: another certified approach, particularly for specific PFAS compounds.

Important limitations

Certification is specific to tested PFAS compounds — "removes PFAS" is not a universal claim.
Activated carbon media can become saturated ("breakthrough") and needs replacement before it stops working, not after.
Confirmatory testing after installation is a good practice to verify performance.

Step-by-step

Confirm your current PFAS levels through your CCR (public water) or certified lab testing (private well).
Choose a system certified for the specific PFAS compounds detected.
Install and maintain per manufacturer schedule, including media replacement before rated capacity is reached.
Consider periodic confirmatory testing.

Common mistakes

Buying a system with a general "reduces contaminants" claim instead of PFAS-specific certification
Running activated carbon media past its breakthrough point
Skipping confirmatory testing after installation

Official sources

NSF/ANSI 53, 58, and 401 certification standards
DNREC PFAS program and ODW PFAS public-water information
U.S. EPA PFAS treatment guidance

Does any filter remove 100% of PFAS?

No treatment claim should promise removal of every PFAS compound. Look for certification specific to the compounds detected in your water, and maintain the system on schedule.

Does not endorse a specific manufacturer or product claim.

Last reviewed: 2026-07-11. Report a correction.