According to the WHO, tap water is safe for consumption for 97% of the country.
The Irish have traditionally always drunk tap water, but in recent years have introduced filter systems to combat the presence of potentially toxic chemicals called trihalomethanes (THMs) in the water supply, which have exceeded EU-sanctioned levels in various parts of the country, including Kerry, Cork, Kilkenny city, Waterford, Wicklow, Meath, Mayo, Roscommon, Donegal and Galway.
Although the potential issues are only associated with long-term exposure to THMs, you should make sure to drink only filtered or bottled water while in Ireland, and never drink from the bathroom tap.
According to the CDC tap water is generally safe for consumption.
According to the Numbeo water drinkability and accessibility index, tap water has a score of 72.8 / 100 (100 being best).
Numbeo considers this score to be "High"
Ireland is a member of the European Union which ensures tap water safety across its countries.
1 adult could save about 1044$ per year in Ireland by drinking tap water instead of buying bottled water.
๐ณ Drinking tap water would also help with reducing your plastic footprint and improve environmental pollution.