According to the EPA Victoria’s 2006 Environmental Audit of the Goulburn River – Lake Eildon to The Murray River, the mean annual concentration for Amitrole T in the Central Goulburn and Shepparton Irrigation Areas was estimated to be above the Australian Drinking Water Guidelines by over 250%. As a result of the EPA audit, Goulburn Murray Water had to test for Glyphosate, Amitrole, 2,4-D and AMPA over a 3 year period. (Guideline Heath limits for Amitrole are 10ppb, Glyphosate 1000ppb and 2,4-D 30ppb).
Between the 9th of May 2006 and 12th of May 2006, 2,4-D was detected at levels between 1920ug/L and 2960ug/L – likely to be the highest levels recorded in Australia. Since the 1950’s 2,4-D has been used throughout Victoria to control aquatic weeds.