One pub in Mayo was found to have potentially breached public health guidelines following the Garda Operation Navigation last weekend.
26 pubs nationally were found to have potential breaches of the health regulations or licensing laws, even after being afforded the chance to rectify the breach.
One of the premises occurred in Mayo and a file is being sent to the Director of Public Prosecutions (DPP) in relation to this case.
Gardaí conducted 6,830 checks of pubs last weekend and of the 2785 operational 99% were in compliance with regulations and licensing laws.
Chief Superintendent Tony Healy of the Mayo Garda Division says the vast majority of publicans and patrons were compliant with health guidelines.