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The Common Agricultural Policy (CAP) is a major driver of the environmental and socialsustainability of the agriculture in the European Union (EU). Under the 2003 CAP reform, mostdirect payments to agricultural producers were decoupled from production.This work assesses the possible impact of the CAP reform on the sustainability of an irrigated areaof Central Italy with particular attention being paid to decoupling. The analysis has been conductedusing the Positive Mathematical Programming (PMP) method that directly estimates the costfunction parameters by imposing the first-order conditions of the farm model under consideration.The analysis assesses the impact of the CAP reform on farm cropping patterns, water and chemicaluse, labour use and economic results. By referring to this set of indicators it is possible toinvestigate the likely effect of the CAP reform on the environmental, social and economicsustainability of the considered farming systems.The results of the empirical analysis mainly show a reduction in water and chemical input use, anincrease in the economic results of farms, but also a reduction of the labour.