The EPA says the 'general waste' bin is overused by some homes and businesses.

The EPA’s Remedial Action List sets out "at-risk" supplies that require significant corrective action.

The EPA says half a million people are in "at-risk" areas with higher lead levels in their drinking water.

According to the report, 2 supplies in Longford and 1 in Roscommon are on the Remedial Action List.

The septic tank issue has been particularly difficult in Leitrim in recent years due to new regulations and the nature of the soil type in the county

New figures from the environmental protection agency also show Roscommon was the worst county nationally for fixing defects.

Just 53% of defects found by inspectors in the county were actually fixed.

The new report has been published today.