Does the province have minimum water efficiency standards more stringent than federal or national requirements?
The National Building Code of Canada is the model building code of Canada. It is issued by the Institute for Research and Construction (IRC), a part of the National Research Council of Canada. As a model code, it has no legal status until it is adopted by a jurisdiction that regulates construction. The Provinces and Territories of Canada are allowed to adopt parts or all of the code and to alter the code as they see fit. The National Building Code is currently undergoing revisions and a proposal was made in 2008 to update the Non-potable Water Systems Section 2.7.4 to include design requirements in accordance with CSA B128.1 and to limit use of non-potable water to water closets, urinals, and directly connected underground irrigation systems. As of 2005 the National Plumbing Code does not explicitly mandate the use of water efficient fixtures – instead it references the ASME A112.18.1-2005 / CSA B125.1-2005 standards which dictate maximum flush volumes for toilets of 13.2 litres, maxim
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