Australian Pesticides Map
According to the EPA the following pesticides were detected in Easterbrook Creek in March 2012: Triclopyr 0.022ug/L, Azoxystrobin 0.002ug/L and Metolachlor 0.011ug/L.
https://www.epa.vic.gov.au/our-work/publications/publication/2013/april/1528