DomesticGreywater Reuse: Overseas Practice and its Applicability
to Australia ReportNo WSAA 73 Thisreport is the second on a
research project to determine the potential fordomestic
greywater re-use in Australia. Thefirst report, “Domestic
Greywater Re-use:Preliminary Evaluation (UWRAA Research Report
No 60)”, was based onoverseas correspondence, a literature
search, and chemical and microbialanalysis of some sullage
systems. That report concluded that the western statesof the USA
and Japan are the world leaders in this type of onsite re-use
andthat greywater re-use poses environmental and health concerns
but, withadequate guidelines, could achieve substantial water
savings. This secondreport investigates overseas practices in
greywater re-use and how thesepractises could apply to
Australia. Domesticwastewater can be segregated into two
separate flows, namely: Although toilet wastes are excluded
fromgreywater, greywater still contains human faecal indicator
bacteria inconcentrations high enough to indicate a h