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To protect bodies of water from detrimental changes to their characteristics caused by substances that are hazardous to water emanating from facilities it is required that substances and mixtures are classified for their water-hazardous properties. Classification is carried out on the basis of the
Ordinance on facilities for handling substances that are hazardous to water (Verordnung über Anlagen zum Umgang mit wassergefährdenden Stoffen (AwSV)) of 18 April 2017
(BGBl 2017, Teil I, Nr. 22, Seite 905). There are three water hazard classes (WGK):

1: slightly hazardous to water,
2: obviously hazardous to water
3: highly hazardous to water.

Furthermore, substances can be classified as non-hazardous to water (nwg) or are deemed hazardous to water in general (awg).

You can search for WGK of currently published WGK classifications in the public section of this webpage. The protected section (geschützter Bereich) is for internal use by the Umweltbundesamt only.

Substances that are currently not published with a WGK classification in the Bundesanzeiger or on this website are regarded as not classified and must be regarded as highly hazardous to water (WGK 3) for reasons of precaution. Facility operators are obliged to self-classify these substances according to Annex 1 of AwSV and to submit the WGK documentation to the Umweltbundesamt. Further Information on the AwSV and the classification procedure can be found here on the website of the Umweltbundesamt.

For the classification of mixtures based on the classifications of the components, the carcinogenic effect and the M-factors of the components must be considered if appropriate. These can currently be found at The WGK documentations of mixtures are to be submitted to local authorities and classifications are not published by the Umweltbundesamt.