Contaminant Reduction Claims

How to find a drinking water filter or system to reduce contaminants.

At NSF, we certify a wide variety of purification systems designed to reduce lots of different contaminants. To help you find the best water filter for your home or office, 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 may be that there are no systems of that type certified to reduce that specific contaminant. Contact us with your questions.

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 chloramine.

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.

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

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