Supplies in Laois and Westmeath are among those to have fallen below.
More than 100 private water supplies failed to meet the bacterial standard for drinking water in 2019.
The Environmental Protection Agency says it's a serious issue that's putting people's health at risk.
It's calling on suppliers, local authorities and government to improve the situation.
Private supplies in Laois and Westmeath were also found to have fallen below standards for nitrates
Senior water inspector at the EPA, Dr. Michelle Minihan, is also concerned about the monitoring of drinking water supplies:
Offaly Prize Bonds Holder Wins €500k
BNM Workshop Reunion Taking Place In Offaly Tomorrow
ICTU Reminds Employees Of The Right To Disconnect
Laois Town To Host Famine Commemoration Event
Plans For Billion Euro Data Centre In Westmeath Face New Appeal
Westmeath Councillor Advocates For More Remote Working Hubs
Midlands Homelessness On The Rise
Hundreds Without Power In Westmeath
Westmeath Domestic Abuse Support Service Reports Rise In Cases
Laois TD Highlights GP Gap
Call Made For 'Cost Of Disability Payment' in Budget 2027
Offaly Coffee Shop Listed Among Top 100 In Europe
Man To Stand Trial Over Midlands Tasering Accusation
Another Report Underlines Midlands House Price Inflation
Midlands Braced For Severe Thunderstorms
Sustainable Livestock Village Programme Launched For Tullamore Show
Offaly Woman Named National Carer Of The Year
Plans Lodged For 40 Year Solar Farm Development In Offaly
Midlands MEP Hosts Online Safety Initiative In Brussels
Oireachtas Report Highlights Planning And Infrastructure Reform Needs