Works to replace the Crosby and Glen Vine Sewage Treatment Works are set to begin this month.
It comes as Manx Utilities have been granted planning permission for the project, which supports the demands of a growing population in the area.
The current treatment works was built in the 1960s and now needs work to bring it up to modern say standards.
The new facility is designed to maximise efficiency and minimise environmental impact.
While work is undertaken there will be a ten week closure of the heritage trail from January.
It's thought the project will be complete by April 2025.
Repairs on Peel Power Station to get underway
Manx Care doctor survey to be discussed by Tynwald
Weather warning for snow tonight
MHK queries safety at primary school in Ballabeg
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night