Hong Kong's Leisure and Cultural Services Department (LCSD) announced on Sunday that Butterfly Beach in Tuen Mun District has been closed after an oil spill was sighted in the area. Red flags have been hoisted and swimmers have been advised to stay out of the water until further notice.
The department issued the advisory at 11:35 am local time on June 14, stating that an oil spill had been detected at the popular bathing beach in western New Territories. Beachgoers were urged not to swim at the beach, and the LCSD said the closure would remain in effect until further notice.
Butterfly Beach, situated along the coastline near the Tuen Mun River channel, is a well-known recreational spot amid the broader Butterfly Beach Park complex, which includes barbecue pits, a children's playground, and a landscaped promenade. The beach is managed by the LCSD and is frequently used by local residents during the summer months.
The cause of the oil spill has not been identified in the initial government announcement. Given the beach's proximity to the Tuen Mun river outlet and the busy Pearl River Delta shipping lanes — among the world's busiest maritime corridors — potential sources could range from vessel discharges to runoff from industrial facilities along the waterfront. The Environmental Protection Department (EPD) was not directly cited in the LCSD broadcast notice, and no additional details on cleanup operations or investigation efforts have been released as of Sunday afternoon.
Hong Kong's coastal waters have experienced periodic pollution incidents in the past. In previous years, oil spills and unusual slicks have been reported at beaches in the New Territories, often linked to shipping activity or illegal discharge from vessels in nearby anchorages. The Hong Kong government typically coordinates multi-agency responses involving the Marine Department, the EPD, and the LCSD when such incidents occur, deploying oil containment booms and cleanup crews to affected shorelines.
The closure of Butterfly Beach adds to a list of beach advisories issued by the LCSD on Sunday. Separately, red flags were hoisted at Deep Water Bay Beach on Hong Kong Island, Hung Shing Yeh Beach in the Islands District, and Hap Mun Bay Beach in Sai Kung due to big waves. Three other beaches — Silver Mine Bay Beach and Pui O Beach in the Islands District, and Ting Kau Beach in Tsuen Wan — were also flagged with red warnings after the EPD's Beach Water Quality Forecast System rated their predicted water quality as "Very Poor" due to transient fluctuations following heavy rain.
The oil spill incident is likely to raise concerns about marine pollution monitoring and response capacity in Hong Kong, particularly during the summer swimming season when beach attendance peaks. Local environmental groups have previously called for stricter enforcement of anti-pollution regulations in Hong Kong waters, including enhanced monitoring of vessel waste discharges and faster deployment of containment equipment when spills are reported.
The LCSD advised members of the public to check the department's beach status webpage or the EPD's Beach Water Quality Forecast System for the latest updates before heading to the coast.
Sources: [HKSAR Government]

