Then work out whether it is one fixture or the whole house, and look in the outside manhole if the cover lifts easily: a full chamber means the block is further along. Put that in the form with your area. When someone can come is agreed directly with the business that calls you.
Expect questions on which fixtures are unusable, whether water is showing outside and how long it has been fully stopped rather than slow.
Keep the bathroom door shut, wash your hands after touching anything wet and keep children and pets out of the way.
If foul water is coming up on the street or footpath rather than inside your boundary, contact Uisce Éireann. It is likely the public sewer.