Key Elements

HATS Stage 1 collects and provides treatment to sewage generated from Kowloon and eastern parts of the Hong Kong Island.
The works include:

  • Construction of a 23.6km sewage tunnel network
  • Upgrading of 7 Preliminary Treatment Works (PTW) in Kowloon and eastern part of Hong Kong Island
  • Construction of Stonecutters Island Sewage Treatment Works (SCISTW)
  • Construction of a 1.7 km long outfall tunnel and diffuser pipeline in the southwest of Stonecutters Island

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