Two water supplies in the Shannonside region have been listed the EPA's 'at risk' list.
They are the North East Regional in Co. Roscommon and the Longford Central supply.
The report says THM limits were exceeded in both supplies.
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They were among 35 supplies around the country on the Environmental Protection Agency's remedial action list at the end of 2025.
The EPA say the completion date for the action plan in Longford is in 2030 whilst a timeline has yet to be announced for Roscommon.
