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The TransNational Monitoring Network is an important tool under the DRPC, whose Contracting Parties are committed to co-operate in the field of monitoring and assessment. Formally launched in 1996, it aims to provide a well-balanced overall view of pollution and long-term trends in water quality and pollution loads in the major rivers in the Danube River Basin.

The TransNational Monitoring Network, in short “TNMN” was established to support the implementation of the Danube River Protection Convention in the field of monitoring and assessment. The TNMN was formally launched by the ICPDR in 1996, although the history of international monitoring of the Danube River is much longer.

The main objective of the TNMN is to provide a structured and well-balanced overall view of pollution and long-term trends in water quality and pollution loads in the major rivers in the Danube River Basin.

The TNMN utilises nationally assessed monitoring data and is based on the provisions of the DRPC, which requires:

  • Harmonising monitoring and assessment methods, particularly concerning water quality in rivers
  • Developing co-ordinated or joint monitoring systems applying stationary or mobile measurement devices, and shared communications and data processing facilities
  • Elaborating and implementing joint programmes for monitoring riverine conditions in the Danube catchment area, including flow rates, water quality, sediments and riverine ecosystems, as a basis for the assessment of transboundary impacts

In 2006, the TNMN is revised to ensure full compliance with the provisions of the EU Water Framework Directive (WFD).

The TNMN monitoring network is based on national surface water monitoring networks and includes 79 monitoring locations with up to three sampling points across the Danube and its main tributaries river. The minimum sampling frequency is 12 times per year for chemical determinands in water and twice a year for biological parameters.

An interim water quality classification scheme has been specially developed to evaluate the data collected by the TNMN.

The assessment of loads in the Danube contributes greatly to estimates of the influx of polluting substances to the Black Sea, and provides vital information to support policy development. A special load assessment programme was started in 2000, with pollution loads calculated for BOD5, inorganic nitrogen, ortho-phosphate-phosphorus, dissolved phosphorus, total phosphorus, suspended solids, and - on a discretionary basis – chlorides.


The information contained in the ICPDR website is intended to enhance public access to information about the ICPDR and the Danube River. The information is correct to the best of the knowledge of the ICPDR Secretariat. If errors are brought to our attention we will try to correct them.
The ICPDR, expert group members, nor other parties involved in preparation of information contained on this website cannot, however, be held responsible for the correctness and validity of the data and information provided, nor accept responsibility or liability for damages or losses arising directly or indirectly from the use of the information conveyed therein.
Only those documents clearly marked ICPDR documents reflect the position of the ICPDR.
Any links to other websites are provided for your convenience only. The ICPDR does not accept any responsibility for the accuracy, availability, or appropriateness to the user's purposes, of any information or services on any other website.
When using the information and material provided on this website, credit should be given to the ICPDR.

Last Edit: 2006-11-02