Which of the following is NOT listed as a common water purification method used by the Army?

• A. Boiling
• B. Ultraviolet Disinfection
• C. Chemical Treatment (Chlorination)
• D. Filtration

Answer: (B)

The method being tested is not used widely in Army field water purification because it requires conditions and resources that are often not practical in austere environments. Ultraviolet disinfection can effectively inactivate microbes, but it needs a reliable power source and clear water. In field settings, water is frequently turbid and power may be limited, and UV treatment provides no residual disinfectant to prevent recontamination after treatment. For these reasons, it’s not considered a common Army method alongside boiling, chemical treatment (chlorination), and filtration, which are portable, robust, and maintain a disinfectant presence or physical safety under varied field conditions. That makes Ultraviolet Disinfection the one not typically listed as a common method.