From HydroWorld.com:
The IIWQ World Water Quality Portal is now available online to “assist with global water quality assessment and capacity building for streams, lakes and rivers.”
This portal was developed by EOMAP GmbH & Co. KG to support the International Initiative on Water Quality (IIWQ) of UNESCO’s International Hydrological Programme.
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Users can select specific locations to view, such as the Itaipu/Parana reservoir shown above (impounded by Itaipu Dam, which supplies water for a 14,000-MW hydroelectric plant). Or they can set a virtual station on a map of the world. Historical data is available back through 2016.
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More Info via the Official News Release:
Direct to International Initiative on Water Quality World Water Quality Portal