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
What’s New with NSF
NSF Welcomes Nicole Parent Haughey to Board of Directors
September 10, 2026NSF's appointment of Nicole supports the organisation's continued focus on long-term growth and transformation.
GRSO (RIOS) and NSF Announce Strategic Alliance to Strengthen RIOS Compliance Infrastructure Across India
August 31, 2026This milestone marks the successful completion of the RIOS Auditor Course by NSF’s team in India and the establishment of a robust regional compliance infrastructure to support organizations seeking RIOS certification.
NSF Launches Independent Certification Standard for Compact Products
August 25, 2026New third-party certification verifies products cutting materials and shipping impacts while maintaining safety and performance.
NSF Achieves European Accreditation for Drinking Water Product Certification Ahead of 2027 EU Deadline
July 22, 2026The 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.