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Certification ensures that the device is made from safe materials and the contaminant reduction claims listed on the packaging are verified by independent data. Search the databases below for water treatment devices that have been certified to NSF/ANSI standards.

NSF International (National Sanitation Foundation) - nsf.org

• Look for the NSF International independently certified mark and listed standard(s) to which the product has been certified.​
• ​Search for NSF-Certified Drinking Water Treatment Units, Water Filters here: [Link]

Water Quality Association (WQA) - wqa.org

• WQA's Gold Seal Product Certification Program ensures that the product is constructed or formulated from safe materials, the claims listed on the packaging are backed by test data, and the product will hold up under normal usage conditions.
• Find WQA-Certified Water Treatment Products​ [Link]​​

International Association of Plumbing and Mechanical Officials (IAPMO) - iapmort.org

• ​​​Learn about the IAPMO R&T Water Systems Certification program and search for devices here: [Link] 

CSA Group - csagroup.org 

• ​​​CSA Group evaluates both point-of-entry and point-of-use products and can test and certify individual plumbing components, such as filter cartridges that reduce lead or chlorine: [Link] 

Underwriters Laboratory (UL) - ul.com

• Water Filtration Products Testing and Certification Services [Link]
• Search UL Certification Information [Link]

ICC Evaluation Service - icc-es.org

• https://icc-es.org/pmg-listing-program/​