Proportion of total population with unimproved water (%)
| 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
| Benin | 19.7 | 20.1 | 20.6 | 20.7 | 20.8 | 20.9 | 21.0 | 21.1 | 21.2 | 21.3 | 21.4 | 21.5 | 21.6 | 21.8 | 21.9 |
| Senegal | 33.6 | 28.2 | 22.8 | 21.8 | 20.8 | 19.7 | 18.7 | 17.7 | 16.7 | 15.7 | 14.7 | 13.8 | 12.8 | 11.8 | 10.9 |
| Guinea-Bissau | 39.8 | 35.6 | 31.5 | 30.7 | 29.9 | 29.1 | 28.2 | 27.4 | 26.6 | 25.8 | 25.0 | 24.2 | 23.4 | 22.6 | 22.5 |
| Togo | 27.7 | 24.3 | 21.0 | 20.4 | 19.7 | 19.1 | 18.5 | 17.9 | 17.2 | 16.6 | 16.0 | 15.5 | 14.9 | 13.8 | 12.8 |
| Burkina Faso | 25.7 | 24.7 | 23.6 | 23.4 | 23.2 | 23.0 | 22.8 | 22.6 | 22.3 | 22.1 | 21.9 | 21.6 | 21.4 | 21.2 | 20.9 |
| Niger | 54.7 | 48.8 | 43.0 | 41.8 | 40.6 | 39.5 | 38.3 | 37.1 | 35.9 | 34.7 | 33.5 | 32.3 | 31.1 | 29.9 | 28.6 |
| Mali | 41.0 | 33.8 | 26.9 | 25.5 | 24.1 | 22.8 | 21.4 | 20.1 | 18.8 | 17.5 | 16.2 | 14.9 | 13.6 | 12.3 | 11.0 |
| Côte d'Ivoire | 15.2 | 14.9 | 14.5 | 14.4 | 14.3 | 14.2 | 14.1 | 14.0 | 13.9 | 13.9 | 13.8 | 13.7 | 13.6 | 13.4 | 13.4 |