On 22 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. Caesium perchlorate

   WGK 3 (highly hazardous to water)

2. Caesium hydroxide

   WGK 2 (obviously hazardous to water)

3. Caesium bicarbonate

   WGK 2 (obviously hazardous to water)

4. 1-methylpyridinium chloride

   WGK 1 (slightly hazardous to water)

5. Caesium

   WGK 2 (obviously hazardous to water)

6. 3,3,5-Trimethylcyclohexyl acrylate

   WGK 2 (obviously hazardous to water)

7. N,N-Diethylbutylamine

   WGK 1 (slightly hazardous to water)

8. Polymer with 1-vinyl-2-pyrrolidone, isooctyl acrylate, methyl acrylate and acrylic acid (average MW 637599 g/mol)

   WGK 2 (obviously hazardous to water)

9. 4-(1,1,3,3-Tetramethylbutyl)phenol, ethoxylated, sulfate, EO 25, sodium salt (average molar weight 1411 g/mol)

   WGK 1 (slightly hazardous to water)

10. N-[2-[2(Dimethylamino)ethoxy]ethyl]-N-methyl-1,3-propanediamine

    WGK 1 (slightly hazardous to water)

11. N-(Tri(hydroxymethyl)methyl)glycine

    WGK 2 (obviously hazardous to water)

12. Tungsten, particle size < 1mm

    WGK nwg (non-hazardous to water)

13. 1,2,4-Butanetricarboxylic acid, 2-phosphono-, compd. with 2-aminoethanol (1:?)

    WGK 2 (obviously hazardous to water)

14. 2-phosphonobutane-1,2,4-tricarboxylic acid, compound with 2,2',2''-nitrilotri[ethanol]

    WGK 1 (slightly hazardous to water)

15. Dipotassium octenylsuccinate

    WGK 1 (slightly hazardous to water)

16. Phosphonic acid, octyl-, compd. with 2-aminoethanol (1:1)

    WGK 2 (obviously hazardous to water)