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Accidental pollution events are dangerous form of water contamination by hazardous substances. Industrial facilities, mining areas and contaminated sites that store, process or produce such substances in substantial amounts pose hazard (potential risk) to water. To avoid pollution accidents appropriate prevention measures have to be in place.

The Accident Emergency Warning System (AEWS) of the Danube River Basin is activated whenever there is a risk of transboundary water pollution, or threshold danger levels of certain hazardous substances are exceeded.

Three sub-basins of the Danube are partly located in Ukraine - the Tisza, Prut and Siret basins, as well as part of the Danube Delta. Furthermore, 2.7 million people live in the Ukrainian part of the Danube Basin, which is 3.3% of the total Danube Basin District. Ukraine has been a Signatory State to the Danube River Protection Convention since 1994. The Convention was ratified by the Ukrainian Parliament in 2002.

Accidental pollution in the Danube River Basin can cause widespread damage to the environment, and endanger the health of local people and the state of local economies downstream. This was exemplified by the effects of the Baia Mare cyanide spill in Romania in 2000 or by the Hungarian redsludge accident at Ajka in 2010. The ICPDR is working to prevent accidental pollution and to improve response capability by compiling an inventory of all relevant "Accident Risk Spots".

As both the largest remaining natural wetland and second largest river delta in Europe, the Danube Delta is one of the continent's most valuable habitats for wetland wildlife. Pollution and discharge manipulation from upstream has a huge effect on this area of high biodiversity, plus the delta continues to change ecologically itself – the Danube Delta spreads seaward at a rate of 10 to 25 metres every year.

Covering an area of 157,186 km², the Tisza River Basin is the largest sub-basin of the Danube River Basin. The Tisza River is the longest tributary of the Danube (966 km), and second largest in terms of flow after the Sava. The countries of the Tisza Basin (Ukraine, Romania, Hungary, Slovakia, Serbia) agreed to close transboundary co-operation, aiming to achieve integrated water resources management of the Basin.