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 30th of March 2006 and 6th of May 2006, Amitrole was detected between 1 and 29ug/L in the Rodney Main Drain at Wyuna. The highest reading was detected on 30th of April 2006. Glyphosate was detected in the Rodney Main Drain, Wyuna at 80ug/L on April 11, 2006.