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NSF 55

Ultraviolet Microbiological Water Treatment Systems

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Organization: NSF
Publication Date: 29 July 2019
Status: active
Page Count: 74
scope:

This Standard covers UV microbiological water treatment systems and components for point-of-use (POU) and point-of-entry (POE) applications. This Standard covers systems which use UV radiation within the range of 240 nm to 300 nm inclusive. Systems are intended to be used under the following specific conditions.

Class A systems

Class A POE and POU systems covered by this Standard are designed to be used for treating microbiologically unsafe water, but do not reduce chemical or inert particulate contaminants. Systems covered in this Standard are designed to inactivate microorganisms, including bacteria, viruses, Cryptosporidium oocysts, and Giardia cysts, from water. Systems covered by this Standard are not intended for the treatment of water that has an obvious contamination or intentional source, such as raw sewage, nor are systems intended to convert wastewater to drinking water. The systems are intended to be installed on visually clear water (not colored, cloudy, or turbid). Systems with manufacturer claims that include components or functions covered under other NSF or NSF/ANSI Standards or Criteria shall conform to the applicable requirements therein.

Class A systems not installed downstream of a device tested for cyst reduction / inactivation in conformance to the appropriate NSF/ANSI Standard may claim Cryptosporidium oocysts and Giardia cysts only. Class A systems installed downstream of a device tested for cyst reduction in conformance to NSF/ANSI 53 or NSF/ANSI 58 may make a general cyst claim when used on untreated surface waters, or ground water, or both, under the direct influence of surface water.

NOTE - Current data support that Cryptosporidium oocysts and Giardia cysts are inactivated by UV treatment.

Class B systems or components

Class B POE and POU systems covered by this Standard are designed to be used for supplemental bactericidal treatment for the inactivation of microorganisms that may be present in drinking water (public or private) considered to be microbiologically safe and of known quality. Systems covered under this Standard are intended to inactivate normally occurring nonpathogenic nuisance microorganisms only.

The Class B system is not intended for the disinfection of microbiologically unsafe water and may not make individual or general cyst claims. Class B systems shall not make microbiological health effects claims. Systems covered by this Standard (Class B) are not intended to be used with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. Systems with manufacturer claims that include components or functions covered under other NSF or NSF/ANSI Standards or Criteria shall conform to the applicable requirements therein.

Purpose

The purpose of this Standard is to establish minimum requirements for the reduction of microorganisms using ultraviolet (UV) radiation. UV water treatment systems covered by this Standard are intended for water that may be either microbiologically safe or microbiologically unsafe. This Standard also specifies the minimum product literature and labeling information that a manufacturer shall supply to authorized representatives and system owners, as well as the minimum service-related obligations that the manufacturer shall extend to system owners.

Document History

NSF 55
July 29, 2019
Ultraviolet Microbiological Water Treatment Systems
This Standard covers UV microbiological water treatment systems and components for point-of-use (POU) and point-of-entry (POE) applications. This Standard covers systems which use UV radiation within...
July 31, 2018
Ultraviolet Microbiological Water Treatment Systems
This Standard covers UV microbiological water treatment systems and components for point-of-use (POU) and point-of-entry (POE) applications. Systems are intended to be used under the following...
June 13, 2017
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
September 9, 2016
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
April 26, 2015
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
October 16, 2014
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
October 6, 2013
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
August 22, 2012
Ultraviolet Microbiological Water Treatment Systems
This Standard covers ultraviolet microbiological water treatment systems and components for point-of-use and point-of-entry applications. Systems are intended to be used under the following specific...
August 27, 2009
Ultraviolet microbiological water treatment systems
A description is not available for this item.
October 22, 2007
Ultraviolet microbiological water treatment systems
A description is not available for this item.
October 1, 2004
Ultraviolet microbiological water treatment systems
A description is not available for this item.
55
June 20, 2002
Ultraviolet Microbiological Water Treatment Systems
A description is not available for this item.
June 20, 2002
Ultraviolet Microbiological Water Treatment Systems
A description is not available for this item.
January 29, 2002
Ultraviolet Microbiological Water Treatment Systems
A description is not available for this item.
January 29, 2002
Ultraviolet microbiological water treatment systems
A description is not available for this item.
January 29, 2002
Ultraviolet microbiological water treatment systems
A description is not available for this item.
January 1, 2000
Ultraviolet Microbiological Water Treatment Systems
A description is not available for this item.
55
January 1, 1991
Ultraviolet Microbiological Water Treatment Systems
A description is not available for this item.

References

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