Households in eight local authorities around the country may have their water supplies disrupted today.
It's due to strike action by members of the Unite trade union.
Two local authorities here in Dublin are included - Fingal and South Dublin County Councils.
Workers are seeking a commitment that water staff transferring from local authorities to Uisce Éireann will retain their public service status.
Unite Trade Union Coordinating Officer Tom Fitzgerald says while the action is regrettable, they will deal with emergencies:
"We have a mechanism in place through an agreement with the various local authorities that essential and emergency work, our members will come off the picket lines and support that work".
