A "pollution incident" caused Littleham Brook in Exmouth to turn a striking neon blue, leading the Environment Agency (EA) to issue a "do not swim" warning for the area. Images shared by the EA show the vividly colored stream, with swimmers advised to avoid entering the water at Exmouth beach while the water is tested for harmful substances. The leak was reported around 8:30pm on Friday and was traced to an "industrial source" by Saturday night. However, the EA noted that no visible damage to the environment had been observed, and the pollutant was no longer spreading. It is still moving downstream and is expected to reach the bathing waters by the afternoon. The EA has stated it will continue monitoring the situation and will lift the swimming advisory once it is safe to do so. The incident is expected to be resolved by 15 September. Littleham Brook, which is about four and a half kilometers long, flows from Littleham Village through Green Farm and Maer Farm, eventually reaching Maer Bridge, where it is piped under the beach and into the sea at Maer Rocks. The Exmouth bathing waters are influenced by the catchment area surrounding Littleham Brook, which covers approximately 600 hectares. However, the larger Exe Estuary catchment, spanning roughly 150,000 hectares, also plays a significant role in the water quality of the area. This means that pollution in either of these regions can have an impact on the local bathing waters. The EA is working to ensure that any potential risks to public health are minimized while the water is being assessed.