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.
Poppy gets fur-ever home after sparking rescue operation in Douglas
Council gets eight complaints about James Brown in six months
More bus staffing problems this weekend
Manx community spirit shines through during Island storms
Free period products law receives Royal Assent
How are Islanders supported while waiting for benefits?
Specialist vans to survey Isle of Man roads next month
Great Laxey Wheel upgrades to see old ticket office removed