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Contaminant Reduction Claims

Find a certified water filter or treatment system using our helpful guide that shows the top contaminants you ask us about.

At NSF, we certify a wide variety of water treatment systems from filtration to reverse osmosis designed to reduce contaminants. To help you find the best water filter for your home or office, we have listed certified products based on the contaminants we are regularly asked about. Keep in mind that if a filter type is not listed, there may be 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 to reduce lead.

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

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

Bacteria/Coliform/Cyst/Virus

Chlorine

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

Chloramine

View all filters and systems certified by NSF to reduce chloramine.

Chromium (Hexavalent)

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

Fluoride

Nitrate/Nitrite

PFOA/PFOS

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

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

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