The final stages of what is deemed a "critical project to strengthen Tauranga's future wastewater needs" begins on February 28.

Connected to the Te Maunga wastewater treatment plant, the final portion of the Te Maunga pipeline upgrade runs from Sunrise Reserve out to Papamoa Beach by Harrison's Cut.

The last 225 metres of the pipeline will undergo essential maintenance to extend its service life through a new, protective internal lining, says a Tauranga City Council spokesperson.

"Locals will see a flurry of construction activity on the beach near Harrison's Cut from: 7am Tuesday 28 February to 8pm Wednesday 1 March, and 7am to 8pm, Thursday 2 March and Friday 3 March."

The four-day window to complete the upgrade has been coordinated with low tides so teams can access the beach manhole.

The beach will remain open during the works, but the worksite will be fenced off to keep people safe with clear signage in place, says council.

"Construction noise is expected during this time.

"Tauranga City Council thanks residents for their patience throughout the Te Maunga pipeline upgrade and we appreciate this activity has been disruptive."