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Affordability of water supply and sanitation services is largely missing from national and global monitoring initiatives and there is currently no universal agreement as to the concept’s definition, appropriate assessment methodologies or monitoring schemes (UNICEF-WHO, 2021). There is thus a need to find suitable approaches that allow us to use regularly reported data to help policy and decision makers identify segments of society that might be disproportionately affected by increases in the prices of basic household needs, like water supply and sanitation. This is directly related to the ‘Leave no one behind’ principle of the 2030 Agenda for Sustainable Development, its Sustainable Development Goals (SDGs) and the EU 2030 target on poverty and social exclusion.