Discharge of sewage effluent
Information about the activities we regulate that involve the discharge of sewage effluent to the water environment including the discharge of grey water and liquid from composting toilets.
Existing sewage discharge that does not have an authorisation
Find out about the registration authorisation needed if you have an existing discharge from less than or equal to 10 domestic properties or 50 population equivalent that does not have an authorisation.
Existing sewage discharge that was authorised by a CAR registration on 31 October 2025
If you have a CAR registration on 31 October 2025, your CAR registration will automatically become this EASR authorisation on 1 November 2025 .
New sewage discharge from less than or equal to 10 domestic properties or 50 population equivalent
Find out about the activities and registration authorisations needed if you have a new sewage discharge from less than or equal to 10 domestic properties or 50 population equivalent where the discharge is not within a phosphate sensitive catchment or directly to a freshwater loch.
Discharge from a sewage treatment works with overflows from more than 10 properties or 50 population equivalent
Find out about the permit authorisation needed to discharge from a sewage treatment works with overflows from more than 10 domestic properties or 50 population equivalent (pe).
Discharge from a sewage treatment works with no overflows from more than 10 properties or 50 population equivalent
Find out about the permit authorisation needed to discharge from a sewage treatment works with no overflows from more than 10 domestic properties or 50 population equivalent (pe).
Discharge of sewage to a phosphate sensitive catchment or a freshwater loch from less than or equal to 10 domestic properties or 50 population equivalent
Find out about the permit authorisation needed to discharge to a phosphate sensitive catchment or a freshwater loch less than or equal to 10 domestic properties or 50 population equivalent (pe).
Discharge of grey water or of liquid from a composting toilet
Find out about the registration authorisation needed to carry out the discharge of grey water or liquid from a composting toilet.
Discharge of sewage where standard conditions cannot be complied with
Find out about the permit authorisation needed to discharge when standard conditions in a registration cannot be complied with.
Search the public register
Search for an authorisation document that you or someone else holds.
Need to speak to someone?
If you need further information or have an enquiry about authorisations, contact us. We aim to respond to your enquiry as quickly as possible.