This report contains a preliminary analysis of the environmental impacts of the Kakhovka dam breach, which occurred in the early hours of 6 June 2023. It explores the environmental impacts of the breach through highlighting both potential impacts (those yet to be established) and measurable or observable changes. A detailed estimation of the full impacts on irrigation, drinking water and supply of water to industry, including the Zaporizhzhia Nuclear Power Plant (ZNPP), and associated human health impacts, fall outside the scope of this rapid assessment but pose a substantial concern.