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
iNADO Partners with NSF to Support Members and Athletes
May 27, 2026iNADO is pleased to welcome NSF’s expertise and experience in support of its members and the athletes they serve
NSF Ends UK’s Three-Year Testing Gap with REG 31 Testing Designation
May 20, 2026NSF’s Oakdale laboratory becomes the UK’s sole facility offering comprehensive BS 6920 and REG 31 testing, closing a critical drinking water safety gap.
Tangent® Materials Announces Industry First: Tangent PolySheet™ CB Earns Certification to NSF 537, Becoming the First PFAS-Free NSF Standard 51 Food Equipment Material
May 20, 2026New food-grade synthetic cutting-board sheet, engineered from the ground up without per- and polyfluoroalkyl substances (PFAS), establishes a new materialsafety benchmark for food-contact and food-equipment applications.
NSF Expands Food Equipment Portfolio with Electrical Safety Testing and Certification
April 30, 2026Manufacturers now have a “one-stop-shop” for both sanitation and electrical safety certification, enabling market expansion and regulatory compliance.