Hong Kong's Leisure and Cultural Services Department announced on August 29, 2026, that red flags had been hoisted at four beaches after the Beach Water Quality Forecast Index reached 4, indicating predicted water quality of "Very Poor." The department attributed the forecast to potential transient water quality fluctuations caused by heavy rain.

The affected beaches were Shek O Beach and Big Wave Bay Beach in Southern District on Hong Kong Island; Clear Water Bay Second Beach in Sai Kung District; and Tai Po Lung Mei Beach in Tai Po District. The assessment drew on the Environmental Protection Department's Beach Water Quality Forecast System.

Beachgoers were advised not to enter the water to safeguard their health.