My Department does not compile the information requested.
The Water Services Act 2007 (as amended) requires the Environmental Protection Agency (EPA) to produce a national inspection plan for domestic waste water treatment systems, also known as septic tanks. The EPA report on the implementation of the plan and publishes information on inspections and enforcement on an annual basis.
The latest report for 2022 can be found on the EPA's website at the link below:
www.epa.ie/publications/compliance--enforcement/waste-water/domestic-waste-water-treatment-system--dwwts-inspections-2022.php