Chapter 12 of the Health Effects of Climate Change (HECC) in the UK: 2023 report. The chapter highlights 3 key insights for public health. First, measures should be taken to reduce exposure to harmful chemicals including pesticides. Second, the management of chemical stockpiles and landfills and the remediation of contaminated sites, should incorporate consideration of vulnerability to extreme weather events such as flooding. Finally, the potential implications of increased frequency and intensity of flooding and storms should be considered in relation to the risk of remobilization of chemicals such as POP into the environment from waste disposal sites, soils and sediments.