People in Co Mayo are facing a second week of drinking water restrictions, as efforts to deal with cryptosporidium in the public supply continue.
46,000 people across the county have been impacted by a boil water notice which has been in place since last Friday.
It is a week since routine testing at the Lough Mask water treatment plant revealed the presence of cryptosporidium.
In a statement this evening, Irish Water said the cause of the contamination has not yet been identified.
The public supply in and around Westport, Castlebar, Knock, Ballyhaunis, Claremorris and Ballinrobe is impacted.
In addition, almost 50 group water schemes that draw from the Lough Mask supply are subject to the restrictions.
An audit of the treatment plant was carried out by inspectors from the Environmental Protection Agency yesterday.
Results from that audit are not yet available and are expected this week or early next week.
That data, along with ongoing sampling of the supply, will be central to determining how long the boil notice is in place for.
Boil water notice lifted for thousands in Loughrea
Elsewhere, a boil water notice for Loughrea in Co Galway has been lifted.
The restrictions were introduced on 1 February and since then, thousands of people in the town and surrounding areas have had to boil water or buy supplies for consumption.
In the meantime, new ultraviolet units have been fitted at two water-treatment plants.
Three reservoirs were flushed out and extensive testing of the network was undertaken. The water on the public supply has now been deemed safe to drink.
Irish Water has said it is pleased the works have been successful and has thanked people impacted by the notice for their patience.
The restrictions caused widespread annoyance in the area, with many complaints about the level of communication relating to the boil notice.
