Do you have to register a septic tank or wastewater treatment system?

How it works in Ireland

Registration is separate from permission. Planning decides whether a system can be built, and the site characterisation says which system suits the ground. Registration puts the installed system on a public record so councils can plan inspections.

Register through Protect Our Water once the system is installed. Keep the registration certificate and ask your installer for the maintenance schedule. Existing certificates stay valid, and you do not have to renew every five years.

City and county councils inspect systems, follow up complaints and identify tanks that may be polluting, working to the EPA’s National Inspection Plan. An inspection can ask for evidence of de-sludging, servicing and your registration certificate, so keep a record. For a treatment plant, this normally includes the service visits.

You operate and maintain the system. A new owner must update the register, and a purchaser’s solicitor will ask for the certificate.

For a new house, the EPA’s 2021 Code applies to site assessments and installations on or after 7 June 2021. The system must be chosen to suit the site assessment, not the other way round.

Registration is also a sale document. A purchaser’s solicitor will ask for the certificate, and a lender may ask for it too. If the house is on a shared or group system, ask who holds the registration and who pays for the de-sludging. Treatment plants usually need servicing under a maintenance agreement, so keep the service reports as well, because an inspector can ask for them.

A common mistake

Assuming the installer or your architect will register it. The law puts the duty on you as homeowner, and the penalty falls on you. Register as soon as the system is installed, and keep the certificate with your maintenance record for your solicitor.