The Leisure and Cultural Services Department announced on August 15, 2026, that red flags were hoisted at Deep Water Bay Beach, Stanley Main Beach and Big Wave Bay Beach in the Southern District of Hong Kong Island.

According to the Environmental Protection Department's Beach Water Quality Forecast System, the Beach Water Quality Forecast Index for these three beaches was 4, meaning the predicted water quality was "Very Poor." The department attributed this to potential transient water quality fluctuations caused by heavy rain.

Beachgoers were advised not to enter the water to safeguard their health. The red flags and water quality prediction reflect conditions reported at the time of the announcement; they are not independently confirmed current conditions.