On 31 October 2022, the German Ordinance on Facilities Handling Substances That Are Hazardous to Water (AwSV) List of published water hazard class (WGK) classifications was updated. The following substances were newly assigned a WGK:

1. 1-methylimidazole

   WGK 2 (obviously hazardous to water)

2. 11-Methyldodecyl laurate

   WGK 2 (obviously hazardous to water)

3. (R)-(3-carboxy-2-hydroxypropyl)trimethylammonium hydroxide

   WGK 1 (slightly hazardous to water)

4. Rubidium chloride

   WGK 1 (slightly hazardous to water)

5. Rubidium nitrate

   WGK 1 (slightly hazardous to water)

6. Caesium hexafluorosilicate

   WGK 3 (highly hazardous to water)

7. Iron citrate

   WGK 2 (obviously hazardous to water)

8. Rubidium carbonate

   WGK 1 (slightly hazardous to water)

9. Rubidium hydroxide

   WGK 2 (obviously hazardous to water)

10. Caesium acetate

    WGK 2 (obviously hazardous to water)

11. Rubidium

    WGK 2 (obviously hazardous to water)

12. Rubidium sulfate

    WGK 1 (slightly hazardous to water)

13. Quaternary ammonium compounds, benzylbis(hydrogenated tallow alkyl)methyl, chlorides, compounds with bentonite

    WGK 1 (slightly hazardous to water)

14. Aziridine, homopolymer, acetate (average MW 207000 g/mol)

    WGK 2 (obviously hazardous to water)

15. Poly(oxy-1,2-ethanediyl), α-hydro-ω-hydroxy-, N1,N3-bis[3-[bis(2-hydroxyethyl)methylammonio]propyl]-N1,N3-bis(2-hydroxyethyl)-N1,N3-dimethyl-1,3-propanediaminium (6:1), 1,1,3,3-tetrakis(hydrogen sulfate), tetrakis(inner salt) (average molar weight 3300 g/mol)

    WGK 1 (slightly hazardous to water)

16. Amides, C16-C18 (even), N,N'-ethylenebis

    WGK 1 (slightly hazardous to water)

17. Zirconium boride

    WGK 2 (obviously hazardous to water)

18. Sodium 4-vinylbenzenesulphonate

    WGK 1 (slightly hazardous to water)

19. Nonylphenol, branched, ethoxylated, sulfate, EO 25, sodium salt (average molar weight 1425 g/mol)

    WGK 1 (slightly hazardous to water)

20. Fatty acids, linear and branched, saturated and unsaturated, Compounds with 2-Butylaminoethanol

    WGK 1 (slightly hazardous to water)