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Are there greywater regulations in Australia?
There sure are! (In some regions at least.) Here's a state and territory blow-by-blow:
Australian Capital Territory: The ACT government does not specifically regulate greywater. However, you are expected to comply with all relevant plumbing legislation. The Department of Health has a fact sheet available - Greywater Use: Guidelines for Residential Properties in Canberra.
New South Wales: No approval is needed for bucketing or diversion, provided the latter is installed by a plumber and meets certain conditions. The local council must approve a NSW Health-accredited domestic greywater treatment system, which a plumber must install. The Department of Energy, Utilities and Sustainability has fact sheets available.
Northern Territory: All greywater use must be approved by the Department of Health and Families, which has information available here.
Queensland: Bucketing or attaching a flexible hose to your washing machine outlet to water the garden does not require council approval, but true diversion or treatment systems must be installed by a plumber and have local council approval. The Department of Local Government, Sport and Recreation has a fact sheet available.
South Australia: As with Qld, bucketing or attaching a flexible hose to the washing machine does not require approval. Diversion or treatment systems must be installed by a plumber and approved by the Department of Health, which has fact sheets here.
Tasmania: It's best to check with your local council, but, in general, if you live in a sewered area, using greywater is not permitted. If you don't live in a sewered area, and/or can get permission from your local council, a licensed plumber must install a diversion or treatment device accredited by the Department of Justice, which has information available here.
Victoria: Bucketing is permitted, and a qualified plumber must install a diversion system but approval is not needed. Treatment systems must also be installed by a plumber, and need local council approval. The Environment Protection Authority has facts sheets here.
Western Australia: Bucketing is permitted, but a diversion or treatment system must be approved the local council and Department of Health, and must be installed by a qualified plumber. The Department of Health has a Code of Practice for the Reuse of Greywater in Western Australia.