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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.

Before purchasing a treatment device, consider which contaminant(s) you need to remove, potential space and installation limitations, costs associated with maintenance of the device, and your home's water supply (i.e., municipal/city water or private well). While no single technology can remove all contaminants, a combination of processes can be used to reduce a wide array of contaminants. ​

Maintenance: If you have a filter to remove contaminants, maintain it according to the manufacturer’s specifications. This might include cleaning it, replacing filter cartridges, and/or calling in a professional for service. Filters overdue for cleaning or replacing may no longer work properly to remove contaminants and may let foul tastes and odors remain in your tap water.

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

• ICC Program Listing [Link]