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The Joint Danube Survey 3 (JDS3) was the world’s biggest river research expedition of its kind in 2013, the UN International Year of Water Cooperation. Its results were published in a comprehensive report in early 2015.

The key purpose of Joint Danube Surveys (JDS) is to produce reliable and comparable information on carefully selected elements of water quality for the length of the Danube River, including its major tributaries. Three Joint Danube Surveys have previously been conducted, in 2001, 2007, 2013, and 2019. The 5th Joint Danube Survey is due to launch on 1st July 2025.

JDS 2, the world's biggest river research expedition, was held in 2007. Its goal was to produce comparable and reliable information on water quality and pollution for the Danube and some tributaries. The ICPDR coordinated its implementation. Launched on August 14, 2007 in Germany, three JDS2 boats traveled downstream the Danube, through 10 countries, to the Danube Delta.

The investigation of the Tisza River was a follow-up project of the Joint Danube Survey 2001 organised by the ICPDR. The objective of the survey was to investigate the water quality along the river and to promote public awareness. The countries participating at the survey include Romania, Slovakia, Hungary, and Serbia and Montenegro.

The Joint Danube Survey 2001 was carried out by the ICPDR and is the most homogenous analysis of the water quality and the ecological status of the Danube River. Over 140 chemical and biological parameters were analysed and over 40.000 laboratory results were generated.

The Danube begins at the confluence of the Brigach and Breg Rivers in the city of Donaueschingen located in the Black Forest, Baden-Württemberg. The German Danube catchment area covers an area of about 56,200 km²; its share of the total Danube catchment area is approx. 7%. The German Danube basin is bordered by the Rhine basin to the west and the Elbe River basin to the east.