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Mexico City Considers Mandatory Greywater Reuse in New Constructions
Mexico City, October 8, 2026 – New constructions in Mexico City could soon be required to implement greywater reuse systems for purposes not requiring potable water. This initiative, presented to the Mexico City Congress by Morena deputy Adriana Espinosa de los Monteros, aims to integrate such infrastructure from the design phase of buildings to reduce the demand for this vital resource, which is increasingly strained by urban development.
The proposal seeks to amend and add to Article 29 of the Law on the Right to Access, Provision, and Sanitation of Water in Mexico City. According to Espinosa de los Monteros, the legislation would apply to both residential and commercial properties, mandating infrastructure for water treatment and reuse. This would ensure that potable water is primarily reserved for activities that necessitate its quality, allowing used water to be recycled within the buildings.
Efficiency and Sustainability at the Forefront
“It is much more efficient to incorporate greywater utilization infrastructure from the design and construction stage of a property than to attempt to install it later,” explained Espinosa de los Monteros. She emphasized that this measure would complement existing water supply policies, including rainwater harvesting, wastewater treatment, and the restoration of water bodies. The capital already has mechanisms in place to integrate alternative collection systems in certain new constructions.
During her address to the plenary, the deputy highlighted the unequal distribution of water access difficulties among families and communities. She proposed addressing water utilization within buildings themselves, in addition to broader actions aimed at guaranteeing supply for all residents.
Addressing Water Scarcity in a Growing Metropolis
The initiative has been forwarded to the Comprehensive Water Management Commission for analysis and review. This move comes as Mexico City continues to grapple with water scarcity issues, exacerbated by population growth and climate change. By mandating greywater reuse, the city aims to create a more resilient and sustainable urban environment.
The proposed legislation reflects a growing global trend towards more efficient water management in urban areas. Greywater, which includes water from sinks, showers, and laundry, can be treated and reused for irrigation, toilet flushing, and other non-potable uses, significantly reducing the strain on municipal water supplies.
Broader Implications for Urban Planning
This initiative is part of a broader effort to integrate sustainability into Mexico City’s urban planning. The emphasis on early integration of greywater systems in the design phase underscores a proactive approach to resource management, aiming to avoid costly retrofits and maximize efficiency. If approved, the reform could set a precedent for other major cities facing similar water challenges, promoting a more circular economy for water resources.
The move also aligns with international best practices for water conservation and sustainable development goals. By reducing the demand for potable water, Mexico City can better protect its natural water sources and ensure a more secure water future for its residents.
