1996: Gwydir River Basin: Pesticides Detected: Endosulfan, Atrazine, Diuron, Prometryne & Chlorpyriphos – Source: Crops : Irrigated cotton, sorghum, maize. Where found: Rivers & streams. Reference Cooper 1996.

https://www.environment.gov.au/node/21899#pesticidesininlandwaters

Highest level of diuron recorded in Gwydir Namoi River catchment, 1990’s, 23ug/L

apvma.gov.au/sites/default/files/publication/15386-diuron-environment.pdf