According to the natural population growth projection and the planned housing development, sewage flow in South Lantau is projected to reach 5800 m3 /day from an ultimate population of around 12600 in 2039. To meet the sewage disposal need, we are going to construct a trunk sewerage system for Pui O area, a secondary STW at San Shek Wan and a village sewerage system for Lo Uk. 

Upon completion of the works, sewage from the area will be conveyed to the proposed STW for proper treatment and the treated effluent will be discharged into the sea about 1.4 km off the South Lantau coast.