"no systematic water testing is done after spraying and rainfall"
Reference: ‘The cancer scare around a common chemical’ ,Australian Financial Review, Page 26. May 7-8, 2005. Author: Julie Macken
"The monitoring of pesticides in inland waters is not undertaken routinely in Australia and apart from the irrigation districts of New South Wales,
there is little recent information. Most monitoring in New South Wales has
been focused on irrigation and drainage canals and tailwater, rather than
rivers and streams (Bowmer et al. 1998). There is also information on
pesticide contamination of groundwater, which is presented in Groundwater
pollution. As pesticides may break down, attach to sediment or be diluted by
the time tailwater and drainage water mixes with rivers and streams, it is
difficult to assess the impact of pesticides on aquatic ecosystems with the
current data available.
Pesticides have been monitored in rivers and streams draining cotton
growing areas of northern and central NSW (Cooper 1996; Muschal 1998). "
Reference: Department of Environment & Heritage Australian 'State of Environment' report, 2001. 'Water quality and sources of pollution'
http://www.deh.gov.au/soe/2001/inland/water02-3b.html