1. National share of wastewater that is safely treated
2. Disposal of sewage sludge after WW treatment
3. River Basin Management Plan (RBMP)
4. Water use efficiency
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Sources:
- https://ourworldindata.org/grapher/wastewater-safely-treated
- https://www.eea.europa.eu/data-and-maps/indicators/generation-and-treatment-of-sewage-sludge; https://www.eea.europa.eu/data-and-maps/figures/treatment-of-sewage-sludge-selected-eea-member-countries-1998
- https://www.eea.europa.eu/data-and-maps/figures/proportion-of-classified-surface-water-7
- https://www.sdg6monitoring.org/indicator-641