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The water industry plays an important role in reducing greenhouse gas (GHG) emissions and therefore, moving to a low-carbon urban water cycle is of great importance. However, traditional performance assessment of water companies ignores GHG emissions. To overcome this limitation and to compare productivity change estimations of water companies excluding and including GHG emissions, this study computes the Luenberger productivity indicator (LPI) and the Malmquist-Luenberger productivity index (MLPI), respectively. Moreover, in a second s