In this division:
"septic tank" means a tank or series of tanks for the sedimentation, disintegration or digestion of sewage.
"septic tank system" means a septic tank and associated plumbing work, including—
(a) upstream drainage (including each toilet) that reticulates waste into the tank; and
(b) the effluent disposal system downstream from the tank.
"toilet" means a structure for receiving human urine or faeces, and includes a flushing toilet, chemical toilet and composting toilet.