I am sorry OM, I love what you bring to this forum, but you are just being stubborn on this issue. Sandia did not use a wikipedia reference. What is not typically accepted in universities is directly referencing Wikipedia articles. What Sandia said was at the bottom of the article is a concise list of references with links. Just because this list happens to hosted on Wikipedia does not somehow make uncitable. Why would you want him to recreate the list here (which would not include links)? I am beginning to conclude you are just being obtuse. Here is the list for you:

^ a b c d Zell SC (1992). "Epidemiology of Wilderness-acquired Diarrhea: Implications for Prevention and Treatment". J Wilderness Med 3 (3): 241–9.
^ a b c Welch TR (2004). "Evidence-based medicine in the wilderness: the safety of backcountry water". Wilderness & Environmental Medicine 15 (4): 235–7. doi:10.1580/1080-6032(2004)015[0235:EMITWT]2.0.CO;2. PMID 15636372.
^ a b Hargreaves JS (2006). "Laboratory evaluation of the 3-bowl system used for washing-up eating utensils in the field". Wilderness Environ Med 17 (2): 94–102. doi:10.1580/PR17-05.1. PMID 16805145. "Diarrhea is a common illness of wilderness travelers, occurring in about one third of expedition participants and participants on wilderness recreation courses. The incidence of diarrhea may be as high as 74% on adventure trips. …Wilderness diarrhea is not caused solely by waterborne pathogens, … poor hygiene, with fecal-oral transmission, is also a contributing factor"
^ a b c d e f g Boulware DR (2004). "Influence of Hygiene on Gastrointestinal Illness Among Wilderness Backpackers". J Travel Med 11 (1): 27–33. PMID 14769284.
^ Welch TP (2000). "Risk of giardiasis from consumption of wilderness water in North America: a systematic review of epidemiologic data". International Journal of Infectious Diseases 4 (2): 100–3. doi:10.1016/S1201-9712(00)90102-4. PMID 10737847. Archived version April 20, 2010
^ a b c Rockwell, Robert L. (2003). "Giardia Lamblia and Giardiasis With Particular Attention to the Sierra Nevada" (PDF). Peak Climbing Section, Loma Prieta Chapter, Sierra Club. Archived from the original on 2008-10-16.
^ a b c d Backer, Howard (1992). "Wilderness acquired diarrhea (editorial)" (PDF). Journal of Wilderness Medicine 3: 237–240.
^ Derlet, Robert W. (April 2004). "High Sierra Water: What is in the H20?". Yosemite Association. Archived from the original on 2007-10-12.
^ (Backer 2007, p. 1371)
^ (Backer 2007, p. 1369)
^ Prepared by Federal-Provincial-Territorial Committee on Drinking Water of the Federal-Provincial-Territorial Committee on Health and the Environment (2004) (2004). "Protozoa: Giardia and Cryptosporidium". Guidelines for Canadian Drinking Water Quality: Supporting Documentation. Health Canada. Retrieved 2008-08-07.
^ Dickens DL, DuPont HL, Johnson PC (June 1985). "Survival of bacterial enteropathogens in the ice of popular drinks". JAMA 253 (21): 3141–3. doi:10.1001/jama.253.21.3141. PMID 3889393.
^ Backer H (2000). "In search of the perfect water treatment method" (PDF). Wilderness Environ Med 11 (1): 1–4. PMID 10731899.
^ Gerba C, Rose J (1990). "Viruses in Source and Drinking Water". In McFeters, Gordon A. ed.. Drinking water microbiology: progress and recent developments. Berlin: Springer-Verlag. pp. 380–99. ISBN 0-387-97162-9.
^ White, George W. (1992). The handbook of chlorination and alternative disinfectants (3rd ed.). New York: Van Nostrand Reinhold. ISBN 0-442-00693-4.
^ (Backer 2007, p. 1374)
^ a b CDC Division of Parasitic Diseases (2004). "CDC Fact sheet: Giardiasis". Centers for Disease Control. Retrieved 2008-10-13.
^ a b National Center for Zoonotic, Vector-Borne, and Enteric Diseases (2008-04-16). ""Crypto" - Cryptosporiodosis". Centers for Disease Control. Retrieved 2008-10-13.
^ a b c Boulware DR, Forgey WW, Martin WJ 2nd (2003). "Medical Risks of Wilderness Hiking". Am J Med 114 (4): 288–93. doi:10.1016/S0002-9343(02)01494-8. PMID 12681456.
^ Scallan, E. J.; A. Banerjee, S. E. Majowicz et al. (2002). "Prevalence of Diarrhea in the Community in Australia, Canada, Ireland and the United States" (PDF). CDC. Retrieved 2008-10-15.
^ Garthright WE, Archer DL, Kvenberg JE (1988). "Estimates of incidence and costs of intestinal infectious diseases in the United States". Public Health Rep 103 (2): 107–15. PMC 1477958. PMID 3128825.
^ Brody, Jane E. (2008-10-15). "HEALTH: Diagnostics; Test Unmasks a Parasitic Disease". New York Times (New York Times Company). Retrieved 2008-10-15.
^ Hlavsa, Michele C.; John C. Watson, Michael J. Beach (2005-01-28). "Giardiasis Surveillance --- United States, 1998--2002". Morbidity and Mortality Weekly Report. Centers for Disease Control and Prevention. Retrieved 2008-10-15.
^ Sanders JW, Frenck RW, Putnam SD, et al. (August 2007). "Azithromycin and loperamide are comparable to levofloxacin and loperamide for the treatment of traveler's diarrhea in United States military personnel in Turkey". Clin. Infect. Dis. 45 (3): 294–301. doi:10.1086/519264. PMID 18688944.
^ (Backer 2007, pp. 1368–417)
^ Johnson, Mark (2003). The Ultimate Desert Handbook : A Manual for Desert Hikers, Campers and Travelers. International Marine/Ragged Mountain Press. p. 46. ISBN 0-07-139303-X.
^ Backer H (February 2002). "Water disinfection for international and wilderness travelers". Clin. Infect. Dis. 34 (3): 355–64. doi:10.1086/324747. PMID 11774083.
^ (Backer 2007, p. 1411)
^ "Steripen - Proven Technology". Hydro-Photon, Inc.. 2008. Retrieved 2008-10-14.
^ "Steripen - Microbiological Testing". Hydro-Photon, Inc.. 2008. Retrieved 2008-10-14.
^ "Household Water Treatment Options in Developing Countries: Solar Disinfection (SODIS)". Centers for Disease Control and Prevention (CDC). 2008-01. Retrieved 2010-07-31.
^ a b (Backer 2007, pp. 1373–4)
^ Gardner TB, Hill DR (2002). "Illness and injury among long-distance hikers on the Long Trail, Vermont". Wilderness & environmental medicine 13 (2): 131–4. PMID 12092966.
^ McIntosh, Scott E.; Drew Leemon, Joshua Visitacion, et al. (2007). "Medical incidents and evacuations on wilderness expeditions" (PDF). Wilderness and Environmental Medicine 18 (4): 298–304. doi:10.1580/07-WEME-OR-093R1.1. PMID 18076301.
^ Taylor, D. N.; K. T. McDermott, J. R. Little et al. (1983). "Campylobacter enteritis from untreated water in the Rocky Mountains". Ann Intern Med 99 (1): 38–40. PMID 6859722. Retrieved 2008-10-16.
^ a b Zell SC, Sorenson SK (1993). "Cyst acquisition rate for Giardia lamblia in backcountry travelers to Desolation Wilderness, Lake Tahoe" (PDF). Journal of Wilderness Medicine 4 (2): 147–54.
^ Welch TP (2000). "Risk of giardiasis from consumption of wilderness water in North America: a systematic review of epidemiologic data". International Journal of Infectious Diseases 4 (2): 100–3. doi:10.1016/S1201-9712(00)90102-4. PMID 10737847.
^ Derlet, Robert W.; James Carlson (>=2003). "Sierra Nevada Water: Is it safe to drink? - Analysis of Yosemite National Park Wilderness water for Coliform and Pathologic Bacteria". SierraNevadaWild.gov. Sierra Wilderness Education Project. Retrieved 2008-10-15.
^ Derlet RW (2008). "Backpacking in Yosemite and Kings Canyon National Parks and neighboring wilderness areas: how safe is the water to drink?". Journal of travel medicine 15 (4): 209–15. doi:10.1111/j.1708-8305.2008.00201.x. PMID 18666919. Lay summary (May 2008).
^ Derlet, Robert W. (April 2004). "High Sierra Water: What is in the H20?". Yosemite Association.
^ (Backer 2007, p. 1372)

And I will remind you, you have yet to back up any of your claims with peer reviewed scientific literature. The CDC may in general be very good about using science to come to their recommendations, however they are not a scientific source. They are a government agency and their conclusions are political (even if they happen to be backed by sound science).