Contaminant Reduction Claims
At NSF, we certify various water treatment systems, from filtration to reverse osmosis, which are designed to reduce contaminants. We have listed certified products based on the pollutants we regularly ask about to help you find the best water filter for your home or office. Remember that no systems may be certified to reduce that specific contaminant if a filter type is not listed. Contact us with your questions.
Lead
View all filters and systems certified by NSF to reduce lead.
- Water Pitchers With Filters
- Faucet Filters
- Under-Sink Filters
- Reverse Osmosis Filters
- Counter-Top (Manual-Fill) Filters
- Counter-Top Filters Connected to a Sink Faucet
- Refrigerator Filters
- Aftermarket Refrigerator Filters
- Integrated Refrigerator Filters
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.
- Whole House Systems
- Faucet Filters
- Water Pitchers With Filters
- Counter-Top Filters Connected to a Sink Faucet
- Counter-Top (Manual Fill) Filters
- Under-Sink Filters
- Reverse Osmosis Systems
- Refrigerator Filters
- Integrated Refrigerator Filters
- Aftermarket Refrigerator Filters
Chloramine
View all filters and systems certified by NSF to reduce chloramine.
- Faucet Filters
- Counter-Top Filters Connected to a Sink Faucet
- Counter-Top (Manual-Fill) Filters
- Under-Sink Filters
- Reverse Osmosis Systems
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.
- Counter-Top Filters Connected to a Sink Faucet
- Under-Sink Filters
- Reverse Osmosis Systems
- Refrigerator Filters
- Aftermarket Refrigerator Filters
- Refrigerator Filters (Integrated)
- Water Pitchers With Filters
- Whole-House Filters
Total Trihalomethanes (TTHM) and Volatile Organic Compounds (VOCs)
View all filters and systems certified by NSF to reduce VOCs including TTHM.
How NSF Can Help You
What’s New with NSF
NSF Drives Industry Conversations at SupplySide Global 2026 - Las Vegas, Oct. 26–30
September 17, 2026NSF returns to SupplySide Global with expert-led training and trusted certification solutions. Visit Booth 4741 to discover how NSF and Cambium Analytica help brands build trust, increase consumer confidence and stand out in a competitive marketplace.
NSF Welcomes Hanjun Kwon, Managing Director, APAC
September 14, 2026Experienced business leader to drive sustainable growth, organizational development and operational excellence across the Asia-Pacific region.
NSF to Exhibit and Present at PACK EXPO International
September 11, 2026NSF is proud to be part of PACK EXPO International 2026, the premier event bringing together packaging and processing leaders from across industries.
Information Systems Security Association (ISSA) Welcomes NSF’s Brian Schultz into the 2026 Hall of Fame
September 10, 2026Lifetime achievement recognition honors exceptional leadership and lasting contributions to the cybersecurity profession.