Nevada Administrative Code
Chapter 445A - Water Controls
PUBLIC WATER SYSTEMS
Treatment of Water: Generally
Section 445A.5265 - Requirements for treatment of Cryptosporidium

Universal Citation: NV Admin Code 445A.5265

Current through September 16, 2024

1. A supplier of water who is required to meet the requirements for treatment of Cryptosporidium contamination pursuant to subsection 4 of NAC 445A.5195 shall implement the requirements of the applicable components of the microbial toolbox options in accordance with 40 C.F.R. §§ 141.716 to 141.720, inclusive, as adopted by reference in NAC 445A.4525. If a supplier of water wishes to use ultraviolet light to meet those requirements, additional information on obtaining approval to operate with ultraviolet light is outlined in the Ultraviolet Disinfection Guidance Manual for the Final Long Term 2 Enhanced Surface Water Treatment Rule, 2006 edition, as published by the United States Environmental Protection Agency, document number EPA 815-R-06-007. A copy of the manual is available, free of charge, at the Internet address http://www.epa.gov/ogwdw/disinfection/lt2/pdfs/guide_lt2_uvguidance.pdf..

2. If a supplier of water wishes to receive treatment credits, in addition to the requirements of subsection 1, the supplier shall:

(a) If using the watershed control program component of the microbial toolbox, demonstrate before any treatment that the actions identified to reduce Cryptosporidium in the source water are capable of 0.5 -log reduction of Cryptosporidium in the source water by:
(1) Reducing the potential for contamination; or

(2) Physical removal.

(b) If using the demonstration of performance component of the microbial toolbox, conduct or cause to be conducted a site-specific study pursuant to a protocol approved by the Division which, at a minimum, must:
(1) Be approved before the commencement of the study, unless the study was conducted before July 1, 2008; and

(2) Provide for the inclusion of the entire treatment process in the study.

(c) If using alternative ozone or chlorine dioxide concentration times time values, conduct or cause to be conducted a site-specific study pursuant to a protocol approved by the Division which, at minimum, must:
(1) Be approved before the commencement of the study, unless the study was conducted before July 1, 2008;

(2) Provide for the measuring of Cryptosporidium inactivation; and

(3) Provide for the study of the full range of expected water quality and operational conditions.

(d) If using the ultraviolet light component of the microbial toolbox, and wishing to obtain approval of an alternative approach to ultraviolet light reactor validation:
(1) Demonstrate inactivation of a test microorganism or a surrogate approved by the Division; and

(2) Document that the validation has been overseen by an independent third party.

Added to NAC by Environmental Comm'n by R194-08, eff. 10-27-2009; A by R118-14, eff. 12/22/2014

NRS 445A.860

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