Just one in five rented accommodation units is meeting the required standards.
The National Oversight and Audit Commission's revealed that out of 16,000, 79% failed inspections last year.
Every property inspected in Kilkenny, Laois, Limerick and Offaly was found to be non-compliant.
Failure rates of over 90% were also recorded in Carlow, Galway city, Mayo and Sligo.
The Irish Examiner reports that only two local authorities had failure rates below 50%, with Cavan and Wicklow having failure rates of 18% and 9%, respectively.
It was revealed that just a quarter of rental units in breach of accommodation standards and regulation last year became compliant before the end of 2017.
Inspection rates varied from a high of 14%, in Monaghan, to a low of less than 2%, in both Dublin city and Galway city.
- Digital Desk