Irish Water says that a boil water notice in South and West Sligo will last at least a fortnight.
About 13,000 people and dozens of businesses across the county have been effected.
Water used for drinking, preparing food that is not cooked, brushing teeth and making ice must be boiled.
Our reporter Barry Whyte has been speaking to these business owners in Tubbercurry and Ballymote and has this special report:
