EU 'One Substance, One Assessment' (OSOA) package enters into force, impacting RoHS scientific/technical tasking arrangements

The European Commission announced that the EU 'One Substance, One Assessment' (OSOA) package entered into force on 1 January 2026. While horizontal in nature, OSOA is relevant to RoHS because it changes governance and how scientific/technical work that underpins chemicals legislation is organised (including re-attribution of certain technical tasks to ECHA and creation of a common chemicals data platform). Compliance teams should monitor downstream impacts on RoHS restriction/exemption assessment workflows, evidence expectations, and process/timeline changes as OSOA implementation progresses.