5796GOVERNMENT GAZETTE, WA 20 December 2016

5796 GOVERNMENT GAZETTE, WA 20 December 2016 3.4 Calculate sufficient space For the purpose of clause 3.3, in calculating the space required for each person— (a) each room is to be considered separately and sufficient space is to be allowed in each room for the number of persons present in the room at any one time; and (b) a deduction is to be made for the space occupied by furniture, fittings and projections of the walls into a room. 3.5 Ventilation (1) A person shall not use or occupy, or permit to be used or occupied, a house unless the house is properly ventilated. (2) For the purpose of subclause (1) a 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 complying with AS 1668.2—2012. (3) The owner of a house provided with a mechanical ventilation or air-conditioning system shall ensure that the system is— (a) maintained in good working condition and in accordance with AS/NZS 3666.2:2011; and (b) in use at all times the building is occupied, if it is a building without approved natural ventilation. (4) If, in the opinion of an EHO, a house is not properly ventilated, the local government may, by notice, require the owner of the house to— (a) provide a different, or additional method of ventilation; or (b) cease using the house until it is properly ventilated. 3.6 Subfloor ventilation The owner or occupier of a house shall make provision for subfloor ventilation by ensuring that air bricks and other openings are kept clear of refuse, vegetation, building materials, dirt and the like. Division 3—Water supply 3.7 Water supply (1) The owner of a dwelling house shall ensure that it is connected with a separate and independent water supply from the mains of a licensed water service operator or a water supply to the satisfaction of the local government. (2) The water supply shall at all times be capable of delivering an adequate supply of water to each tap in the house. (3) The water supply to toilets or for garden use may be from a source other than drinking water. 3.8 Rain water tanks (1) The owner or occupier of a dwelling house for which part of the water supply is drawn from a rain water tank shall— (a) maintain in a clean condition— (i) the roof, guttering and downpipes forming the catchment for the tank; and (ii) the guttering and downpipes appurtenant to the roof; (b) ensure that each rain water tank is fitted with a tight-fitting mosquito proof cover which shall not be removed at any time except for the purpose of cleaning, repairing or maintaining the tank; and (c) thoroughly clean and disinfect such tank, at least once in each year, or whenever directed by an EHO to do so. (2) The owner or occupier of a house for which its entire water supply is drawn from a rain water tank shall ensure that the storage capacity of the tank is not less than 90 000 litres. (3) The owner or occupier of any non-residential premises on which rainwater and/or borewater is used for human consumption shall— (a) once every calendar month, have the bacterial quality of each individual water source tested in accordance with the Australian Drinking Water Guidelines 2011, published by the National Health and Medical Research Council; (b) disinfect the water supply prior to entry into the premises and monitor and record the level of disinfection and pH of the water on a daily basis; (c) where chlorine is used as the method of disinfection, ensure a free residual chlorine level of between 0.2 milligrams per litre and 0.5 milligrams per litre in the water received from any outlet used for drinking purposes; and (d) ensure the pH of the water received from any outlet used for drinking purposes is maintained between 7.2 and 7.8.