title as nzs 6400 2005 incorporating amendment nos 1 2 3 4 and 5 water efficient productsrating and labelling 60 pages in english and plumbing code of australia volume 3 national construction code 196 pages in english to be made mandatory on 1 october 2011 by ministerial determination under the water efficiency labelling and standards act 2005 58 pages in english . minimum wes the australian government is introducing minimum water efficiency standards wes for clothes washing machines cwm and labelling requirements for combination washer dryers cwd that use water in the drying mode . from 1 october 2011 only cwm with a water efficiency star rating index of 2.5 stars or greater for machine with a washing load of under 5 kilograms and 3.0 stars or greater for cwm with a washing load of 5 kilograms and over can be registered with the wels scheme for supply in australia. from 1 october 2012 cwm that do not meet the minimum wes will be de-registered. in addition all cwd that use water in the dryer mode must carry a water usage label. this requirement also comes into effect on 1 october 2011. the water efficiency labelling and standards act 2005 is the enabling legislation that allows the minister responsible for wels to determine the wels standard. currently the minister has determined that the wels standard is as nzs 6400 2005 water efficient productsrating and labelling incorporating amendment nos 1 2 and 3 . a new ministerial determination is intended to be made by september 2011 which will determine the wels standard from 1 october 2011 to be as nzs 6400 2005 incorporating amendment nos 1 2 3 4 and 5 water efficient productsrating and labelling. the minimum wes for cwm and new labelling requirement for cwd are detailed in amendment 5 of as nzs6400 2005. watermark certification wels products other than dishwashers and clothes washing machines will also need to have watermark certification where the product is required to be wels certified by the state or territory in order to be wels registered as of 1 october 2011.