The WHO defines as those that provide a private space and good hygiene conditions (i.e., connection to a sewer system, septic tank, rudimentary flush latrines, simple pit latrines, improved pit latrines, and ventilated improved pit latrines).
For more information on types of sanitation facilities, please refer to this link.
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World countries most disadvantaged in terms of access to improved sanitation in 2015
This statistic illustrates the ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015. It shows that in South Sudan, only 7 percent of the population had access to improved sanitation facilities that year.
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WHO. (May 19, 2016). Ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/
WHO. "Ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015." Chart. May 19, 2016. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/
WHO. (2016). Ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/
WHO. "Ranking of Countries Worldwide with The Lowest Share of The Population Having Access to Improved Sanitation Facilities in 2015." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 19 May 2016, /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/
WHO, Ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015 ÌÇÐÄÆƽâ°æ, /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/ (last visited July 24, 2026)
Ranking of countries worldwide with the lowest share of the population having access to improved sanitation facilities in 2015 [Graph], WHO, May 19, 2016. [Online]. Available: /statistics/1640891/ranking-countries-world-lowest-share-population-access-improved-sanitation/
