The indicator is defined as the proportion of water bodies in the country that have good ambient water quality. Ambient water quality refers to natural, untreated water in rivers, lakes and groundwaters and represents a combination of natural influences together with the impacts of all anthropogenic activities. Metadata: https://environmentlive.unep.org/media/docs/projects/step_by_step_methodology_632_revision_final.pdf, https://unstats.un.org/sdgs/metadata/files/Metadata-06-03-02.pdf