Guidance for Compliance with NSF/ANSI Std 61 In Drinking Water Systems

The State of California’s Title 22 Drinking Water Standard Section 64591 states: “after March 9, 2008 a water system shall not use any chemical, material, lubricant, or product in the production, treatment or distribution of drinking water that will result in its contact with drinking water... that has not been tested and certified as meeting the specifications of NSF International/American National Standard Institute (NSF/ANSI) 61-2005/ Addendum 1.0 - 2005 (Drinking Water System Components - Health Effects.)”  

An ad hoc subcommittee was formed in late 2012 to address a recurring subject at CANV AWWA conferences brought forth by utility owners, consultants and manufacturers alike that is challenges complying with NSF/ANSI Standard 61 concrete and other materials used in drinking water systems.

The subcommittee formed a working group and worked with the California Division of Drinking Water (known as CA Department of Public Health when the efforts began) to insure there is clarity in the process for insuring compliance with Standard 61 and that the materials used are equally as protective of public health.   In addition, the group engaged with California Construction and Industrial Materials Association (CALCIMA) for their input and expertise on product availability and testing for concrete and individual components from suppliers.

The group has finalized guidance and developed sample specifications for concrete in direct contact with potable water NSF-ANSI Std 61 Guidance.  In addition, the group has confirmed when performing soak tests on aggregate materials it is acceptable to NSF to perform tests on the smallest aggregate since it has the highest surface area to volume ratio. Letter from NSF