National Sanitation Foundation

The National Sanitation Foundation was founded in 1944 in the School of Public Health, University of Michigan, Ann Arbor, Michigan. It’s now known as NSF International, The Public Health and Safety Company™, a not-for-profit, non-governmental organization, is the world leader in standards development, product certification, education, and risk-management for public health and safety.

For the seals industry the two crucial standards are

  • NSF51 - the Food and Beverage Standard
  • NSF61 - for Drinking Water System Components

The NSF Water Distribution Systems Programme is responsible for the certification of drinking water treatment chemicals and drinking water system components to ensure that these products do not contribute contaminants to drinking water that would cause adverse health effects.

NSF Standard 61 Drinking Water System Components - Health Effects is the US nationally recognised health effects standard for all devices, components and materials that contact drinking water.

Similar standards from other countries include

  • ACS - French Standard for water approval
  • KTW - German Standard for water approval
  • WRC - UK Standard for water approval
  • AS1646 - Australian Standard for Elastomeric Seals for Waterworks Purposes
  • AS/NZS 4020 - Testing of products for use in contact with drinking water

You can find out more at