1995 November – 1997 April. Winnellie Drain (Darwin). Pesticides detected: DDT, Chlordane, Dieldrin, Heptachlor

The Quality of Run-Off and Contaminant Loads to Darwin Harbour, 1995 – 2000. A. Padovan (2001)
This study measured the quality and quantity of run-off from catchments representing the major land uses around Darwin Harbour, including urban, light industrial, rural and
undisturbed. Surface water samples (flow weighted composite) were collected from 1 site within each representative catchment area throughout the 1995/96, 1996/97 and 1999/2000 wet seasons. 8 sampling events occurred for the undisturbed catchment. 12 sampling events occurred for the rural catchment. 22 sampling events occurred for the urban catchment. 16 sampling events occurred for the light industrial catchment.
https://www.lrm.nt.gov.au/__data/assets/pdf_file/0017/13850/pesticide-study-appendices.pdf