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Household water treatment and safe storage (HWTS) interventions are proven to improve water quality and reduce diarrheal disease incidence in developing countries. Four of these proven HWTS options – chlorination, solar disinfection, ceramic filtration, and flocculation/disinfection – are widely implemented in developing countries. Oganizations wanting to develop HWTS programs are often faced with the difficult decision of selecting which optionor options are appropriate for their particular circumstances. The most appropriate HWTS option for a location dependson existing water and sanitation conditions, water quality, cultural acceptability, implementation feasibility, availability of HWTS technologies, and other local conditions. This series of fact sheets is designed to assist organizations incomparing, and ultimately selecting, the appropriate proven HWTS option or options. For more information on household water treatment, please visit www.who.int/household_water. For more information on solar disinfection programs in developing countries, please visit www.sodis.ch or www.fundacionsodis.org.