Moorabool Treatment plant treats water sourced from the Moorabool River System. The water is then distributed through the Geelong region. Water at the plant was polluted between January 2006 and October 2008 with the forestry herbicide Hexazinone after a pollution event at Korweinguboora Plantation. The highest levels of Hexazinone reached the plant during November 2006. The 2,4-D incident in June 2008 remains Victoria’s 5th highest detection of that herbicide in a water supply. Low levels of Atrazine were also recorded for 9 months between September 2011 and June 2012.