On 17 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-ethylhexyl nitrate

   WGK 3 (highly hazardous to water)

2. Butanedioic acid, 2-methylene-, polymer with ethenyl acetate, hydrolyzed, sodium salts (molar weight 30000-300000 g/mol)

   WGK 1 (slightly hazardous to water)