2004?: Sydney Rainwater Tanks (New South Wales) – Lead
“…In Brisbane (Queensland), a study detected lead in 15% of harvested rainwater samples at concentrations ranging from 0.01 ppm to 10.0 ppm (with one sample having a concentration of 85.0 ppm) . In Sydney, Newcastle (New South Wales) and Esperance (Western Australia), the situation was similar. Water sampled from rain water tanks in Sydney contained lead up to 0.35 ppm , up to 0.16 ppm in Esperance , and up to 5.77 ppm in Newcastle . A tank in the town of Karumba in the Shire of Carpentaria, northern Queensland contained up to 100 ppm lead .
These results demonstrate a need for future epidemiological studies to determine whether there is a public health risk from these detected levels.”
Lead, Zinc, Copper, and Cadmium Content of Water from South Australian Rainwater Tanks
Chirhakarhula E. Chubaka ID , Harriet Whiley ID , John W. Edwards and Kirstin E. Ross
Int. J. Environ. Res. Public Health 2018, 15, 1551; doi:10.3390/ijerph15071551
Lead Australian Drinking Water Guideline 0.01mg/L
“… Lead can be present in drinking water as a result of dissolution from natural sources, or from household plumbing systems containing lead. These may include lead in pipes, or in solder used to seal joints. The amount of lead dissolved will depend on a number of factors including pH, water hardness and the standing time of the water.