The Global Freshwater Quality Database (GEMStat)

The Global Freshwater Quality Database GEMStat provides scientifically-sound data and information that can help you to better understand the state and trend of global inland water quality and produce statistical and graphical analysis of water quality data at the station, country, and catchment level. It features interactive maps that provide an overview of global water quality by means of water quality indicators for dissolved oxygen, nitrogen, phosphorus, and pH.