The second phase of works will be carried out from the Glen Road to the Threemilehouse Road.

The works would take place at a site in Beckscourt, Bailieborough.

There is particular concern about household demand between 5pm and 7pm each day.

Revenue for the first half of this year was up 42% to €4.2 billion.

SIPTU says members have taken the 24-hour stoppage after pursuing every other avenue open to them.

These higher levels of bacteria are usually short-lived and further samples will be taken.