The notice was dispatched following consultation with the Health Service Executive.
It is believed around 2,000 customers will be affected by this disruption to service.
Almost 700 households are affected by the public water notice in areas including Adare, Tuogh, Kilknockan, Curraghbeg, Copay, Blackabbey, Gortaganniff, Graigue, Drehidtarsna, Boulabally, Beabus, Baurnalicka, Derryvinnane, Castleroberts, Lissaleen, Cloonaduff, Kilgobbin, Mondellihy, Rineroe, Knockanes and Caherass.
Donal Brennan, Senior Engineer, Water Services, confirmed that Limerick County Council has detected a deterioration in the water quality leaving the Water Treatment Plant in Adare.
He said: "The treatment efficiency of the plant has been reduced and while no adverse bacteriological samples have been detected there is an increased possibility of bacteria getting through the system.
"Therefore, it is necessary to issue a general boil water notice on the supply.
"The reduced treatment efficiency has caused excess aluminium concentrations in the delivered water and vulnerable users such as those persons with poor kidney function, renal failure and, in particular, those on renal dialysis are advised not to drink the water, but to source alternative supplies," he added.
Limerick County Council has advised all Adare Water Supply customers not to drink the water except under the following conditions and for the following purposes:
- Water for drinking purposes, brushing teeth and food preparation should be boiled.
- Boil the water to ensure a rolling vigorous boil and then allow it to cool. Cover it and store it in a fridge or cold place. (Tea or coffee made with water which has boiled is safe to drink.)
- Water from the hot tap is not safe to drink. Domestic filters will not guarantee that water is safe to drink. Discard ice cubes in fridges and freezers.
- Use water that has been prepared for drinking (i.e. that is boiled) for preparing foods that will not be cooked, e.g. for washing salads.
- It is safe to drink commercial bottled mineral water.