Skip to main content

NSF/ANSI 244 Technical Requirements

NSF/ANSI 244 is the American National Standard that sets benchmark criteria for drinking water filters designed to protect against intermittent incursions or accidental microbiological contamination of public or private drinking water.

What’s the need?

Health-conscious consumers look to water filtration manufacturers for technologies that are certified to provide an extra layer of protection for themselves and their families.

Private water sources, such as wells, are not always tested regularly, so contamination of this kind can occur in both public and private water supplies.

Testing required under NSF/ANSI 244

Testing under this standard includes:

  • Structural integrity
  • Material safety
  • Reduction testing to show a 3-log reduction of bacteria and viruses, respectively.

Product types eligible for this certification

  • Ultrafiltration
  • Microfiltration
  • Nanofiltration
  • Reverse osmosis
  • Ceramic.

NOTE: Products must include an End-of-Life Indicator (ELI).

Learn more about our water filtration services

Test and certify water filtration and treatment systems, tailored for municipal, residential, or commercial use.

How NSF Can Help You

Get in touch to find out how we can help you and your business thrive.

What’s New with NSF

  • NSF Achieves European Accreditation for Drinking Water Product Certification Ahead of 2027 EU Deadline

    July 22, 2026
    The ISO/IEC 17065 accreditation from BELAC complements NSF’s testing capacity, enabling end-to-end support for EU Drinking Water Directive (DWD) readiness ahead of the January 2027 deadline.
    Read the Story
  • NSF Awards World-First Community Catch Certification to Orkney Crab Fishery

    July 13, 2026
    Milestone certification sets a new benchmark for small-scale fishery sustainability and social responsibility.
    Read the Story
  • NSF Issues First-Ever MSC Certification for an Eel Fishery to Perupez S.A.C. and Sakana del Peru

    June 19, 2026
    Third-party certification plays a key role in independently verifying the sustainability of seafood operations.
    Read the Story