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Ultraviolet Disinfection



Ultraviolet Disinfection Guidelines, Third Edition (2012)


The purpose of the Ultraviolet Disinfection Guidelines for Drinking Water and Water Reuse is to provide regulatory agencies and water and wastewater utilities with a common basis for evaluating and implementing ultraviolet (UV) disinfection, which is a water treatment technology that can inactivate many waterborne pathogens.


The Third Edition of the UV Guidelines was published in August 2012.




Purpose of the Revisions in the Third Edition:


The UV Guidelines were revised in 2012 to reflect experience gained from the application of the guidelines over the years. Specifically, the intent of the revision was to:


(1) Document the current practice of “spot-checking” performance bioassays for the validation of full-scale performance in lieu of conducting velocity profiles.


(2) Standardize the assignment of UV dose when conducting MS-2 based viral assays by making use of a standard dose-response relationship.  An appendix was also added to illustrate the computations discussed in Chapter 3: Protocols. 


In the future, it is anticipated that a revision will be undertaken that will address ongoing technological advances and other issues. Click here to support the next revision of the UV Guidelines.




For more information or to ask a question about the UV Guidelines, please contact Kevin Hardy at

(714) 378-3278 or email him.




1993 UV Guidelines (Historical Document)


In September 1993, NWRI published the "UV Disinfection Guidelines for Wastewater Reclamation in California and UV Disinfection Research Needs,"a 36-page document, for the California Department of Health Services (now the California Department of Public Health). 


The 1993 guidelines were the precursor to NWRI’s 2012 UV Guidelines (see above).


Click here to download the report (2.88-MB PDF)




Other Sources of Information


Prepared by the U.S. Environmental Protection Agency, Office of Water

November 2006


Symposium Abstracts prepared January 2000

120 Pages