On 15 November 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. Tall oils

   WGK 1 (slightly hazardous to water)

2. Acrylic acid, monoester with propane-1,2-diol

   WGK 2 (obviously hazardous to water)

3. (2,5-Dioxopyrrolidin-1-yl)-9H-fluoren-9-ylmethyl carbonate

   WGK 2 (obviously hazardous to water)

4. Butyl benzoate

   WGK 1 (slightly hazardous to water)

5. 2-Hexyldecanoic acid

   WGK 2 (obviously hazardous to water)

6. Sulfuric acid, mono-C8-18-alkyl esters, magnesium salts, compds. with triethanolamine

   WGK 1 (slightly hazardous to water)

7. Caesium carbonate

   WGK 2 (obviously hazardous to water)

8. 3,5-Bis(1,1-dimethylethyl)-4-hydroxybenzoic acid hexadecyl ester

   WGK 1 (slightly hazardous to water)

9. Titanium hydride, particle size < 1 mm

   WGK 1 (slightly hazardous to water)

10. Zirconium, particle size < 1 mm

    WGK 1 (slightly hazardous to water)

11. Caesium bromide

    WGK 2 (obviously hazardous to water)

12. Polymer with maleic anhydride and isobutylene (average MW 43000 – 400000 g/mol)

    WGK 1 (slightly hazardous to water)

13. Propyltriacetoxysilane

    WGK 1 (slightly hazardous to water)