Question to the Department for Environment, Food and Rural Affairs:

To ask the Secretary of State for Environment, Food and Rural Affairs, with reference to the report entitled Bioaccumulation of microplastics in decedent human brains, published in Nature Medicine on 3 February 2025, what assessment he has made of the potential impact of microplastics in UK waters on (a) the environment and (b) public health.

Microplastics have been widely detected in the environment – in the air, soils, rivers, and the seas. We are aware there is still much work to be done to strengthen our understanding of the impacts of microplastics in the water and wider environment. Defra engages with the academic community working in this area and keeps a close observation of emerging evidence of the risks microplastics may pose to the environment.

Under the 2022/23 UK REACH Work Programme, Defra initiated a research proposal to investigate the risks of intentionally added microplastics. The evidence project has reviewed their emissions, and the risks they pose both to human health and the environment. It also included a socio-economic assessment. This project is expected to report in early 2025. Defra and the Welsh and Scottish Governments will consider its findings once complete.

The UK Health Security Agency (UKHSA), in collaboration with Imperial College, is carrying out research and providing evidence to assist the understanding of potential risks from exposure to micro and nano plastics through inhalational and oral routes. The potential impact of microplastic materials on human health has been assessed by the UK Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment (COT), who made a number of recommendations for further research. The most recent COT statement was published in 2024. The statements are available here.

The COT concluded that based on the available data a full risk assessment on the toxic effects of inhaled micro and nano plastics could not be carried out. The Committee concurred with the conclusions reached by other bodies, including the World Health Organization, that further research is required. The COT's statement is available here.

The Government is working with the devolved Governments to legislate for the ban on wet wipes containing plastic across the UK. We have been supporting Water UK’s behaviour change campaign to ‘Bin the Wipe’ which encourages consumers to dispose of wipes in the bin, not the toilet. The Government’s message is clear – if you need to use wet wipes, dispose of them in the bin, not the loo. Flushing wet wipes causes a number of environmental and drainage impacts.