To assess the environmental risk of Copper-Chromium-Arsenic (CCA) leaching from treated posts in the vineyards of the Marlborough region, New Zealand we carried out an experimental and modelling study on soils throughout the Marlborough region. In a survey in 2004 we found elevated levels of copper, chromium and arsenic (CCA) in soils surrounding the vineyard posts in the Marlborough Region. In the region close to the post ~25% of the soils had levels of arsenic (As) or chromium (Cr) above the National Environmental Protection Measures (NEPM) of the Australian National Environmental Protection Council (ANEPC) guidelines for agricultural soils (100 mg/kg).