Drainage Services Department

PWP No. 4411DS

Upgrading of San Wai sewage treatment works – phase 1

Project Scope

Upgrading of the sewage treatment level from preliminary treatment to chemically enhanced primary treatment with disinfection; expansion of the treatment capacity to 200,000 cubic metre per day; construction of ancillary works including an administration building, a maintenance workshop, access roads and landscaping works

Major Improvements and Benefits

Upgrading the treatment level of San Wai sewage treatment works will help to reduce pollution loads to the North-western Waters; and expansion of the treatment capacity will be able to cater for additional flows due to population growth in Northwestern New Territories


AECOM Asia Company Limited


ATAL-Degremont-China Harbour Joint Venture

Contract No.
Project Commencement Date
27 May 2016
Project Completion Date
31 December 2020
Project estimate

$2,572.3 million

Controlling Division
Harbour Area Treatment Scheme Division
Sewerage and sewage treatment
Yuen Long
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