13,000 consumers supplied by the Lough Talt public water supply have been advised to continue to boil water before use, at least until the end of April.
The boil water notice was issued on 5th February following the detection of cryptosporidium in the water, and Irish Water announced on Friday that, of 18 samples collected over the past few weeks, six of the samples have shown cryptosporidium.
The areas affected include the towns of Tubbercurry and Ballymote and a number of villages in Sligo as well as Cloontia, Doocastle and the Moylough group water scheme in Mayo.
Householders and businesses are urged to boil water before use until further notice.
Irish Water is apologising for the inconvenience, and has confirmed today that businesses affected will get a 40% discount on their water in bill.
In the meantime, a planning application is being prepared to install the necessary barriers against cryptosporidium at the Lough Talt water treatment plant.
An Bord Plenala refused permission for the scheme in the past on environmental grounds.
Sligo TD Eamon Scanlon says the public’s right to a clean water supply should be more important than protecting a species of snail, which has not been seen in the area in several years.