On 30 March 2023, 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. Acetone oxime

   WGK 3 (highly hazardous to water)

2. Polytetrahydrofuran (average MW 250 - 650 g/mol)

   WGK 1 (slightly hazardous to water)

3. 2 -Propenoic acid polymer with ethene, ammonium salt (average MW 13300 g/mol)

   WGK 2 (obviously hazardous to water)

4. Polyisoprene, partially hydrogenated (average MW 31000 g/mol)

   WGK 1 (slightly hazardous to water)

5. Manganese(II) carbonate

   WGK 2 (obviously hazardous to water)