un-water is the convener for world water day and selects a theme for each year in consultation with un organizations that share an interest in that year's focus. the theme for 2019 was "leaving no one behind" and encourages people to consider marginalized groups as these are often overlooked and discriminated against when they try to access safe water. previous themes for the years 2014 to 2018 were "water and energy", "water and sustainable development", "water and jobs'", "why waste water?" and "nature for water".