Contaminant Reduction Claims Guide

At NSF, we certify a wide variety of purification systems designed to reduce many different kinds of contaminants. To help you find the best water filter for you, we have these lists of certified products based on the contaminants we get the most enquires about. Keep in mind that if a filter type is not listed, it is likely that there are no systems of that type certified to reduce that specific contaminant.

Have questions? Contact NSF Consumer Information at info@nsf.org for further assistance.

Lead

View all filters and systems certified by NSF International to reduce lead.

Arsenic (Pentavalent) for Treating Incoming Levels of <=50 ppb

View all filters and systems certified by NSF International to reduce arsenic less than 50 ppb.

Bacteria/Coliform/Cyst/Virus

Chlorine

View all filters and systems certified by NSF International to reduce chlorine.

Chloramine

View all filters and systems certified by NSF International to reduce chlorine.

Chromium (Hexavalent)

View all filters and systems certified by NSF International to reduce hexavalent chromium.

Fluoride

Nitrate/Nitrite

PFOA/PFOS*

View all filters and systems certified by NSF International to reduce PFOA/PFOS.

*Because we are in transition from the protocol to the NSF International/ANSI 53 certification for this reduction claim, products are listed under either the protocol or the standard.

Total Trihalomethanes (TTHM) and Volatile Organic Compounds (VOCs)

View all filters and systems certified by NSF International to reduce VOCs including TTHM.

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