Providing water equally and sustainably in megacities is a challenge that requires integrating people's needs and concerns. This defy is assessed from Mexico City, from which a series of observations and a methodology analyze and compare scenarios of water conditions in the 16 municipalities, integrating citizen participation to implement sustainable actions that improve water supply. Citizens' reports from 2002 to 2022 in a free digital platform were used to correlate the variables of leaks and water shortages. This was complemented with information from water endowment (Liters/day/inhabitant) from groundwater sources that supply the city. For the latter, projections (with the additive model) to 2022 were generated since records were available up to 2018. To identify priority areas to invest in measures that favor water supply in the municipalities, we further considered the adaptation measures applied by the city government, e.g., the purchase of portable water tanks and Rainwater Harvesting Systems (RWHS). Both measurements proved essential but need to be of more extensive application. Government and society must improve their use by promoting conscious consumption of water, impulse repairing leaks, further implementing Rainwater Harvesting Systems (RWHS), and integrating the resources (inputs/outputs) in a water circularity model, maximizing their utility and recirculation.
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