South West Water said the Helford project had been "challenging"

More than �1m was spent on two pumping stations and a treatment works to override seven crude sewage outfalls into the River Helford.

All sewage will receive secondary treatment before being pumped into the river's watercourses.

A party is being held in the local Ship Wrights pub to celebrate the project.

Thirty-eight properties in Helford have been connected to the works.

I want to say a personal 'thank you' to the residents for being so understanding Robert Prentice, SWW

Robert Prentice from South West Water told BBC News local people had worked very closely with the company on the project, despite obvious disruption.

"This project will bring the sewerage system in this part of Helford into the 21st century as well as improving water quality in the creek," he said.

"Helford has been a particularly challenging location for the team to work in because of the narrow roads and limited access.

"I want to say a personal 'thank you' to the residents for being so understanding of the work we were doing."

Mr Prentice said the liaison between residents, SWW and its contractors had made the contract a "tremendous success".

Resident Neil Carlier said SWW and the construction team had "gone out of their way" to be polite and considerate while work was carried out.

He said: "From stopping work to let walkers go past to carrying delivered furniture along a closed road to a house, the team's attitude and consideration has been wonderful."