A boiled water notice was issued for the Grangemore area of north Roscommon, with reports that the contamination could have been caused by animal waste.
The contamination was discovered late last week, the presence of coliforms was detected in the water. It was also noted that there were low chlorine residuals in the network. It is thought that the contamination may be the result of animal waste entering the water supply.
Many households in the area remain under a boiled water notice, with investigations ongoing into the source of the contamination. Irish water said the public risk from this water supply is currently rated as very low.
The notice applied to consumers on the Grangemore Public Water Supply and the Ballinameen Camlin Group Water Scheme. Other affected areas include Croghan, Ballymore, Ballinameen, Killaraght in Co. Sligo, the Plains and other surrounding areas.
Irish water and the Roscommon County Council say that once boiled, water is safe for consumption.
“It is imperative that people adhere to the boil water notice while being reminded that once boiled, the water is safe to consume”, Irish Water advised.