Background
Chemicals play an essential role in everyday life, but their production, use and disposal can pose risks to human health and the environment. Chemical regulation aims to manage these risks. Measured or predicted environmental concentrations in water, soil or air are compared against protective thresholds, such as Environmental Quality Standards (EQS) or predicted no-effect concentrations (PNECs). These thresholds are derived from toxicity testing carried out according to internationally accepted OECD test guidelines. Where concentrations exceed these thresholds, regulators may require additional controls, restrictions or mitigation measures.
Chemical regulation in the UK is complex. Much of the current framework originated as EU legislation. EU directives set goals that Member States must achieve through their own national laws, whereas EU regulations apply directly and uniformly across all Member States. In the UK, Acts of Parliament provide primary legislation, while regulations (secondary legislation) set out the detailed rules and technical requirements. Because environmental policy is a devolved responsibility, there can also be differences between England, Scotland, Wales and Northern Ireland.
Industrial chemicals in Great Britain are regulated under UK REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals), which was carried over from EU REACH when the UK left the EU. Northern Ireland continues to follow EU REACH. The Health and Safety Executive (HSE) is the regulator for UK REACH, Defra is responsible for policy, and local authority trading standards enforce compliance at the point of sale. UK REACH places responsibility on those who manufacture or import chemicals to understand and manage the risks associated with their use. It also promotes alternatives to animal testing, and registration data requirements scale with the quantity of a substance placed on the market each year. Some chemicals fall under separate frameworks. Plant protection products are authorised under retained Regulation (EC) 1107/2009, human medicines are regulated by the MHRA, veterinary medicines by the Veterinary Medicines Directorate, and radioactive substances under their own dedicated regime. Further legislation covers the end of a chemical's life cycle, including hazardous waste and environmental permitting.
Broader environmental legislation derived from EU directives also shapes how chemicals are managed in the UK. The Water Framework Directive, the Urban Waste Water Treatment Directive and the Drinking Water Directive were all transposed into UK law and remain the legal foundation for much of UK water policy.
Since the end of the Brexit transition period in 2021, some divergence has emerged between the UK and EU. The EU has launched its Chemicals Strategy for Sustainability, which includes plans to phase out non-essential uses of PFAS. It has also added substantially more substances of very high concern and new restrictions under REACH than the UK has under UK REACH. This divergence creates uncertainty for industry operating across both markets, may slow the UK's response to emerging chemical threats, and could reduce UK influence as global standards are developed.
Beyond the national and EU level, the UK has legally binding obligations under the Basel, Rotterdam and Stockholm Conventions. These cover transboundary movement of hazardous waste, prior informed consent for trade in hazardous chemicals and pesticides, and the elimination of persistent organic pollutants. In 2025, the Intergovernmental Science-Policy Panel on Chemicals, Waste and Pollution was established alongside the IPCC and IPBES. Its creation signals that chemical pollution is now recognised as a global priority on a par with climate change and biodiversity loss.
Emily Forbes at the JNCC in the UK gives an overview of the regulatory approaches to prevent and manage chemical pollution
Key reading
EU divergence
Jones LB, Burns CJ. REACHing for divergence?-UK chemical regulation post-Brexit. Integr Environ Assess Manag. 2024 Sep;20(5):1529-1538. doi: 10.1002/ieam.4941. Epub 2024 May 7. PMID: 38712803.
Intergovernmental Science-Policy Panel on Chemicals, Waste and Pollution
Example of regulation in practice
https://link.springer.com/article/10.1186/s12302-025-01236-0
Potiszil, C. (2016) Chemicals Regulation. House of Commons Library Briefing Paper No. 7681. London: House of Commons Library. Available at: https://researchbriefings.files.parliament.uk/documents/CBP-7681/CBP-7681.pdf (Accessed: 28 September 2026).