The Environmental Protection Agency is sending an inspector to the Ringsend wastewater treatment plant in Dublin this afternoon.
Recent images show the water at a discharge point at the plant in Ringsend being discoloured, leading to concerns of another leak at the facility.
Last week, swimming bans were issued at a number of beaches in Dublin Bay following a spillage.
It was the second time that a spillage from the facility caused the ban in June, with 8 beaches closing off for a week earlier in the month.
In a statement this morning, Irish Water denied there was another leak at the plant.
An EPA spokesperson has said an update will be provided later this afternoon
