jan 2003:
One Darling Downs farmer says tests of water samples from his rain tank last year revealed levels of the organochlorine pesticide endosulfan of 18ug/L. The maximum recommended level in drinking water in Australia is .05ug/L. [That’s 360 times above the Australian Safe Drinking Water Guideline!!!]
https://www.smh.com.au/articles/2003/01/17/1042520777478.html