Almost a quarter of all rat control call-outs in the last year were for properties in Dublin City Centre.
Pest control company Rentokil says that nationally, calls for help have doubled since the summer of 2018.
They're blaming environmental factors, including climate change and an increase in litter and pollution.
Speaking to Adrian Kennedy on 98fm's Dublin Talks Dublin City Councillor Mannix Flynn said the south inner city is very badly affected.
"Digges Street, York Street, Mercer Street and Golden Lane recently are basically being riddled with rats.
He said, "There's no culling of them there doesn't seem to be a programme where we have pest control."
Calls For The Council To Act
Councillor Flynn is calling on the local authority to deal with the source of the problem.
He says it begins in the sewers.
"When you have a situation where Irish Water is admitting it has no control of the sewage that it's simply pumping it into the waters off the coast and into the bay and into the River Liffey.
He added, "This is a food source for rats so you can imagine what's going on under your feet.
"I have not seen a report that has indicated to me that the powers that be are going down there and dealing with the problem."