Nevada Administrative Code
Chapter 445A - Water Controls
PUBLIC WATER SYSTEMS
Treatment of Water: Generally
Section 445A.522 - Filtration: Efficiencies for removal
Universal Citation: NV Admin Code 445A.522
Current through September 16, 2024
1. For the purposes of meeting the levels of treatment set forth in NAC 445A.520:
(a) Conventional filtration treatment is
presumed to be capable of achieving at least 99.9 percent or 3-log removal of
Cryptosporidium, 99.7 percent or 2.5 -log removal of
Giardia
lamblia cysts and 99 percent or 2-log
removal of viruses if the process is in compliance with the operating criteria
set forth in NAC 445A.533 and the standards of performance set forth in NAC
445A.521;
(b) Treatment by direct
filtration is presumed capable of achieving at least 99.7 percent or 2.5 -log
removal of Cryptosporidium, 99 percent or 2-log removal of
Giardia
lamblia cysts and 90 percent or 1-log
removal of viruses if the process is in compliance with the criteria and
standards set forth in paragraph (a); and
(c) Treatment by diatomaceous earth
filtration and slow sand filtration is presumed capable of achieving at least
99.9 percent or 3-log removal of Cryptosporidium, 99 percent
or 2-log removal of Giardia
lamblia cysts and
90 percent or 1-log removal of viruses if the process is in compliance with the
criteria and standards set forth in paragraph (a).
2. The Division or the appropriate district board of health may grant higher efficiencies for removal than those specified in this section if the supplier of water demonstrates by a protocol reviewed and approved by the Division or the appropriate district board of health that:
(a) For Giardia
lamblia cysts and virus, the higher efficiency for removal can
be obtained reliably; and
(b) For
Cryptosporidium, the filtration system can meet the
requirements of the treatment performance component of the microbial toolbox
pursuant to NAC 445A.5265.
Added to NAC by Bd. of Health, eff. 11-29-90; A by R088-00, 8-3-2001; A by Environmental Comm'n by R126-05, 10-31-2005; R194-08, 10-27-2009
NRS 445A.860
Disclaimer: These regulations may not be the most recent version. Nevada may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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