The plant has come under the spotlight in recent weeks following a number of overflows into Dublin Bay.
The plant which treats around 40 percent of Ireland's sewage is operating above capacity with problems arising during periods of heavy rain.
The facility serves the Greater Dublin Area and parts of Meath and Wicklow.
A permanent swimming ban is in place at Sandymount and Merrion strands because of ongoing cleanliness concerns.
According to the Environmental protection agency the Ringsend facility is designed to treat the wastewater for around 1.64 million people.
However figures say the load entering the plant comes from a population of more than 2 million.
Work has begun on a new €400m upgrade and extension to the plant.
Irish Water has apologised in advance for any potential odours that arise while the work is being carried out.