At present, sewage generated from the unsewered premises in Sai Kung are mostly treated by septic tanks with soakaway systems. These septic tanks are often not effective in removing pollutants as some of them have been used for years without adequate maintenance and the rapid development in recent years. The sewage from these unsewered premises is discharged directly or indirectly into the existing stormwater drainage systems, natural streams and water courses, thus causing environmental nuisances. As a long term measure to combat the pollution problem and to enhance the living environment while meeting the relevant legislation requirements, Drainage Services Department is planning to provide public sewerage systems to the Port Shelter areas in stages.

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