However, importing water from neighbouring basins cannot be the main strategy to supply water to the ZMVM, because this practice has created social and political conflicts and led to regional deficits of water (Escolero Fuentes et al., The water tariff in the Valle de Mexico does not reflect the environmental damage to the Lerman and Cutzamala basins. Moreover, the costs associated with water delivery across long distances (and heights) are high, and increased reliance on surface water systems increases vulnerability to climate change.