An investigation needs to be done to pin point where foul water has been diverted into storm drains around Letterkenny, according to Councillor Dessie Larkin.
Cllr. Larkin said a solution the problem, highlighted by the floods in July, could be found in the multi-million euro Letterkenny Trunk Sewer project.
This project is currently with the Department of Environment for approval.
Speaking at a recent meeting of Letterkenny Town Council, Cllr. Larkin said there was now an opportunity to alleviate the problem through the Trunk Sewer Project.