NAC445A.524. Filtration: Use of alternative technology.

     1. The use of an alternative filtration technology, including packaged treatment plants, may be approved by the Division or the appropriate district board of health if the following requirements are met:

     (a) The supplier of water demonstrates that the technology proposed provides a minimum of 99 percent or 2-log removal of Giardia lamblia cysts and 99 percent or 2-log removal of Cryptosporidium. The process must meet the standards of performance established in NAC 445A.521.

     (b) An engineering report is submitted to the Division or the appropriate district board of health documenting the results of experiments done at pilot plants or tests completed on a full-scale installation that is treating water with similar characteristics and exposed to similar hazards as the water proposed for treatment.

     (c) If the alternative filtration technology is used to meet greater removal efficiencies for Cryptosporidium than those specified in paragraph (a) and includes the use of bag filters, cartridge filters or membrane filtration, the supplier of water shall ensure that the filters are operated in accordance with 40 C.F.R. § 141.719(a) and (b), as adopted by reference in NAC 445A.4525.

Ê If a supplier wishes to use bag filters, cartridge filters or membrane filtration, additional information on obtaining approval to operate with these technologies is outlined in the Membrane Filtration Guidance Manual, 2005 edition, published by the United States Environmental Protection Agency, document number EPA 815-R-06-009. A copy of the manual is available, free of charge, at the Internet address http://www.epa.gov/safewater/disinfection/lt2/pdfs/guide_lt2_membranefiltration_final.pdf.

     2. If the use of an alternative filtration technology is approved by the Division or the appropriate district board of health, the supplier of water shall submit an engineering report, not less than 6 months after the system becomes operational, verifying that the alternative technology meets the standards established for performance under actual conditions of operation.

     3. If the supplier of water does not meet these standards, he or she shall submit to the Division or the appropriate district board of health a timetable for the correction of the deficiencies.

     (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)