The Ontario Building Code | Classification of Systems
18.104.22.168. Classification of Systems
(1) All sewage systems shall be classed as one of the following:
(a) Class 1 — a chemical toilet, an incinerating toilet, a recirculating toilet, a self‑contained portable toilet and all forms of privy including a portable privy, an earth pit privy, a pail privy, a privy vault and a composting toilet system,
(b) Class 2 — a greywatersystem,
(c) Class 3 — a cesspool,
(d) Class 4 — a leachingbed system, or
(e) Class 5 — a system that requires or uses a holding tank for the retention of hauled sewage at the site where it is produced prior to its collection by a hauled sewage system.