On 28-29 February 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. Thioglycolic acid, hydrates and salts of ammonium, alkali metal, and alkaline earth metal

   WGK 3 (highly hazardous to water)

2. [(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methylamino]methane sulfonic acid, hydrates and salts of ammonium, alkali metal, and alkaline earth metal

   WGK 3 (highly hazardous to water)

3. Reaction mass of melamine and Nickel, 5,5'-azobis-2,4,6(1H,3H,5H)-pyrimidinetrione complexes

   WGK 1 (slightly hazardous to water)

4. 1-methylheptyl methacrylate

   WGK 2 (obviously hazardous to water)