The Ontario Building Code | Classification of Systems 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.