Hong Kong's Leisure and Cultural Services Department announced on August 16, 2026, that the Beach Water Quality Forecast Index for Big Wave Bay Beach in the Southern District of Hong Kong Island stood at 4, indicating predicted water quality of "Very Poor." The department attributed the forecast to potential temporary fluctuations in water quality caused by heavy rain, citing the Environmental Protection Department's Beach Water Quality Forecast System.

A red flag was hoisted at the beach, and beachgoers were advised not to enter the water to protect their health. The notice was issued as an item of interest to swimmers, with a request that television and radio announcers broadcast it promptly.