Leeds, Grenville and Lanark District Health Unit - Home Page 

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	Classification of Systems
	All sewage systems shall be classed as one of the following: • Clearance Distances for Class 1, 2 and 3 Sewage System
	(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 class 2 sewage system can only be used for the treatment and disposal of greywater (non-human body waste) i.e., kitchen sink wastes, bathtubs, washing machines, etc… This type of system is ONLY adequate to treat small amounts of greywater (less than 1000 litres per day) for premises such as cottages and hunt camps, etc.
	(c)	Class 3 – a cesspool,
	(d)	Class 4 – The most common type of sewage system, which is used to service single-family dwellings, multiple units, and commercial premises is Class 4. It is typically composed of a two-compartment septic tank and a leaching bed. The septic tank collects the raw sewage and helps in settling and digestion.
	(e)	Class 5 – a system which 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.