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The Global Freshwater Quality Database GEMStat provides scientifically-sound data and information on the state and trend of global inland water quality. As operational part of the GEMS/Water Programme of the United Nations Environment Programme (UNEP), GEMStat is hosted by the GEMS/Water Data Centre (GWDC) within the International Centre for Water Resources and Global Change (ICWRGC) in Koblenz, Germany.

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Data portal:

Explore available water quality data and view statistical visualisations at different spatial scales.

Data portal

Water quality indicators:

Visualise the status of freshwater bodies worldwide by means of water quality classification maps.

Water quality indicators

Statistic reports:

Retrieve aggregated statistics of GEMStat water quality data, for the spatial coverage and the aggregation level you need.

Statistic Reports

Data submission:

Read our data policy and data submission manuals and learn about how to contribute to GEMStat.

Data submission


Monitoring SDG indicator 6.3.2 on ambient water quality

Improving ambient water quality globally is one of the 169 ambitious targets set out in the Agenda 2030 for Sustainable Development (target 6.3). Comprehensive and up-to-date monitoring data on ambient water quality is a prerequisite to provide decision makers with the information they require to ensure the availability and sustainable management of water resources for both human uses and maintaining aquatic ecosystems. …