"Raw sewage is running down the street," said Cllr John Pender as he called on Irish Water to address the issue as a "matter of urgency" in Hacketstown.
He raised the problem at the December meeting of Tullow Municipal District.
Cllr Pender said: "The issue is in relation to Irish Water. There's a sewage issue in Marian Terrace in Hacketstown. Raw sewage is running down the street over there.
"There's a pipe blocked or something and it's coming up and running down. I'd appeal to someone to get in contact [with Irish Water] as a matter of urgency."
In a statement to Carlow Live, Irish Water said: "We were notified of a sewer blockage in Marian Terrace shortly before Christmas. Crews subsequently cleared the blockage.
"However investigations showed that further repairs are required to the sewer pipe. These will be carried out as soon as crews are available. In the meantime, the area has been made safe and we will continue to monitor the situation.
"Irish Water apologies for any inconvenience as a result of this issue."