The highly residual organochlorine Dieldrin was detected at Highton at 10% of Australian Drinking Water Guideline levels in October 1999. This remains the highest level of this now banned insecticide detected in a Victorian water supply. Dieldrin accumulates in the fatty tissue of animals, including humans. A recall of Dieldrin occurred in Australia in 1987.
28/10/99 Barwon Water Highton PreDisinfection Dieldrin 0.03ug/l (10%adwgh)