Between June and early September 2026, 208 temporary swimming bans were issued by mayors in the French region of Brittany. These restrictions followed poor water quality results from inspections carried out by the Regional Health Agency (ARS). In 2025, a similar number—238—of such bans were issued across the same region, indicating a recurring issue. The bans are typically implemented to protect public health, as contaminated water can lead to illnesses such as gastroenteritis or skin infections. The primary reason for these bans is the presence of high levels of bacteria, particularly Escherichia coli (E. coli), which can enter water bodies through agricultural runoff, sewage leaks, or heavy rainfall. These bacteria are harmful to humans and can cause illness if ingested or come into contact with open wounds. The ARS regularly tests water quality at beaches and other public swimming areas, and if levels exceed safe thresholds, local authorities are required to issue temporary closures. Some experts suggest that climate change may be contributing to the increase in water contamination. Warmer temperatures can accelerate the growth of harmful bacteria, while more frequent and intense rainfall events can wash pollutants into waterways more quickly. This combination of factors may be making it more difficult to maintain safe water conditions for recreational use. Local officials and environmental groups are working to address the issue through improved infrastructure, better monitoring systems, and public awareness campaigns. While the number of bans has remained relatively stable between 2025 and 2026, the long-term goal is to reduce the frequency of these restrictions and ensure that swimming areas in Brittany remain safe for the public.