On 18 January 2024, 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-methylaminoethanol

   WGK 2 (obviously hazardous to water)

2. Pentacarbonyliron

   WGK 1 (slightly hazardous to water)