6040GOVERNMENT GAZETTE, WA 22 December 2017

6040 GOVERNMENT GAZETTE, WA 22 December 2017 (b) a habitable room in the dwelling house to be used for sleeping purposes unless— (i) for every person over the age of 10 years using the room there is at least 14 cubic meters of air space per person; and (ii) for every person between the ages of 1 and 10 years there is at least 8 cubic meters of air space per person; or (c) any garage or shed to be used for sleeping purposes. 3.2.3 Calculate sufficient space For the purposes of clause 3.2.2, in calculating the space required for each area— (a) each room shall be considered separately and sufficient space shall be allowed in each room for the number of persons present in the room at any one time; and (b) a deduction shall be made for the space occupied by furniture, fittings and projections of the walls into a room. 3.2.4 Ventilation (1) A person shall not use or occupy, or permit to be used or occupied, a dwelling house unless the dwelling house is properly ventilated. (2) For the purposes of subclause (1) a dwelling house shall be deemed to be properly ventilated if it complies with the Building Code, including the provision of— (a) natural ventilation; or (b) a mechanical ventilation or air-conditioning system with AS 1668.2:2012. (3) The owner of a dwelling house provided with a mechanical ventilation or air-conditioning system as its only or prime means of ventilation shall ensure that the system is— (a) maintained in good working condition in accordance with AS/NZS 3666.2:2011 as amended from time to time; and (b) in use at all times the building is occupied. (4) If, in the opinion of an Environmental Health Officer, a dwelling house is not properly ventilated, the local government may by notice require the owner of the dwelling house to— (a) provide a different, or additional method of ventilations; or (b) cease using the dwelling house until it is properly ventilated. (5) The owner shall comply with a notice under subclause (4). 3.2.5 Sub-floor ventilation The owner or occupier of a dwelling house with sub-floors shall make provisions for sub-floor ventilation by ensuring that air bricks and other openings are kept clear of refuse, vegetation, building materials, dirt, excessive moisture and the like. Division 3—Water Supply 3.3.1 Water supply (1) The owner of a dwelling house shall provide a continuous supply of potable drinking water obtained from— (a) a licensed water service operator; (b) an underground bore; (c) a rainwater storage system with a storage capacity to the satisfaction of the local government; and such supply shall be reticulated for use in connection with all sewerage and drainage fixtures. (2) The water supply shall at all times be capable of delivering an adequate supply of drinking water to each tap in the dwelling house. (3) The water supply to toilets or for garden use may be from a source other than drinking water that will not create a health hazard. 3.3.2 Rainwater tanks (1) The owner or occupier of a dwelling house for which part of the water supply is drawn from a rainwater tank shall— (a) maintain in a clean condition— (i) the roof forming the catchment for the tank; and (ii) the guttering and downpipes appurtenant to the roof; (b) ensure that each rainwater tank is fitted with tight-fitting mosquito proof cover or be otherwise sealed to prevent mosquitoes entering the tank which shall not be removed at any time except for the purpose of cleaning, repairing or maintaining the tanks; (c) thoroughly clean and disinfect each tank when appropriate, or when directed by an Environmental Health Officer to do so. (2) The owner or occupier of any non-residential premises in which rainwater and/ or bore water is used for human consumption shall— (a) once every calendar month, and prior to first use, have the bacterial quality of each individual water source tested in accordance with the Australian Drinking Water Guidelines 2011, as amended from time to time, published by the National Health and Medical Research Council;