Originally Posted by
Traffic_Is_Er_Was
Parafield doesn't list toilets under its Passenger Facilities. Therefore you shouldn't be surprised that there are none available.
A bit beside the purpose of this thread, but there are public toilets available 24 x 7 at Parafield.
If you go through the gate on the eastern apron next to the Aerostar hangar, they are about a 30 second walk.