Lap Sap (垃圾) means "rubbish" in Cantonese. It is unclear that why the bay was named 'rubbish' in the past. However, coincidentally it was once a dumping area for rubbish after extensive reclamation. It is assumed that in Gin Drinkers Bay Park or Kwai Chung Park near Pillar Island that the area is subject to landfill gas produced deep in the ground even though it is covered with hills of earth. It remains closed due to unsafe levels of landfill gas.