"building" means,

(a) a structure occupying an area greater than ten square metres consisting of a wall, roof and floor or any of them or a structural system serving the function thereof including all plumbing, works, fixtures and service systems appurtenant thereto,
(b) a structure occupying an area of ten square metres or less that contains plumbing, including the plumbing appurtenant thereto,
(c) plumbing not located in a structure,
(c.1) a sewage system; or
(d) structures designated in the building code;

Construct is defined as to do anything in the erection, installation or extension or material alteration or repair of a building and includes the installation of a building unit fabricated or moved from elsewhere and "construction" has a corresponding meaning.

(2.1) Sewage Systems. In addition to the criteria set out in subsection (2), a sewage system is unsafe if it is not maintained or operated in accordance with this Act and the building code. 1997, c. 30, Sched. B, s. 10(1).

Leaching bed means an absorption system constructed as absorption trenches or as a filter bed, located wholly in filter media that is contained between the surface to ground or raised or partly raised above ground as required by local conditions, to which effluent from a treatment unit is applied for treatment and disposal and that is composed of,
(a) the soil (as defined in Part 8), leaching bed fill or other which the sanitary sewage is applied and the bottom of the bed,
(b) the distribution pipe and the stone or gravel layer in which such pipe is located, and
(c) the backfill above the distribution pipe, including the topsoil and sodding or other anti-erosion measure, and the side slopes of any portion elevated above the natural ground elevation.

Leaching bed fill means unconsolidated material suitable for the construction of a leaching bed placed in the area of the leaching bed in order to obtain the required unsaturated zone below the distribution pipes, and the required lateral extent such that the effluent is absorbed.

Private sewage disposal system means a sewage system or a sewage works which is not owned and operated by the Crown, a municipality or an organisation acceptable to the Director responsible for issuing a Certificate of Approval under the Private sewage disposal system means a sewage system or a Ontario Water Resources Act.

Sewage system means

(a) a chemical toilet, an incinerating toilet, a earth pit privy, a pail privy, a privy vault and a recirculating toilet, a self-contained portable toilet and all forms of privy including a portable privy, an composting toilet system,
(b) a greywater system,
(c) a cesspool,
(d) a leaching bed system, or
(e) 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,
where these
(f) have a design capacity of 10,000 Litres per day or less,
(g) have, in total, a design capacity of 10,000 Litres per day or less where more than one of these is located on a lot or parcel of land, and
(h) are located wholly within the boundaries of the lot or parcel of land on which is located the building which they serve.

Septic tank means a watertight vault in which sanitary sewage is collected for the purpose of removing scum, grease and solids from the liquid without the addition of air and where solids settling and anaerobic digestion of the sanitary sewage takes place.

Treatment unit means a device which when designed, installed and operated in accordance with its design specifications provides a specific degree of sanitary sewage treatment reducing the contaminant load from that of sanitary sewage to given effluent quality.