In Akureyri, you can find them in the following sites:
Camping sites:
Hamrar, Akureyri
Hrafnagil
Other sites:
Akureyri, gas station, Olís
This brochure enlists the location of all dump stations in Iceland.
This map contains the GPS-coordinates of all dump stations in Iceland
Toilet holding tanks should always be emptied at locations with the appropriate facilities to do so or so-called dump stations. Regulations on hygiene require camp sites and motorhome parks to provide the appropriate facilities to empty and clean built-in toilets and tanks in motorhomes. Camp managers should provide information on the location of these dump station. Information on dump stations and their location is also provided elsewhere, such as at gas stations.