On 20 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. 2-phenylpropan-1-ol

   WGK 1 (slightly hazardous to water)

2. Germanium dioxide

   WGK 3 (highly hazardous to water)