Residents in parts of South Roscommon could be subjected to a boil water notice for up to a year after a cryptosporidiosis outbreak.
Six cases of cryptosporidiosis have already been identified after an outbreak at Killeglan Spring. The spring supplies the South Regional Water Supply scheme.
The treatment plant is one of four in the county along with Arigna, Boyle/Ardcarne and Roscommon Central still awaiting upgrades for a UV and filtration system.
Cryptosporidiosis is a gut infection caused by a parasite that causes diarrhoeal illness. Severe illness can occur in people with poor immune systems, the elderly or very young.
Townloands affected: Dysart, Brideswell, Esker, Bealnamullia, Crancam, Cloonown, Cornafulla, Nure, Lowtown, Thomastown, Moore, Cloonburren, Creggan, Oldtown, Ballydangan, Cullaghmore, Beagh, Suckfield, Cloonulty, Ballygortagh, Carrowreigh, Taughmaconnell, KIlleglan, Castlesampson, Feevagh, Ardkeenan, Drum, Tulrush, Ardnaglug, Skyvalley, Newtown and Cloonkeen. Also affected are the following group water schemes: Ballygortagh, Camlagh, Castlesampson, Creggan Cornafulla, Culleen, Culliaghmore, Dysart, Esker, Griffin/Kilroy, Knock, Taughmaconnell, Moore, Oldtown Clonown, Oonagh Taughmaconnell and Parkmore