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Atotonilco WWTP (México), the world’s largest wastewater treatment plant, celebrates its first year in operation

  • An average of 31.5 m3/s of water has been treated during this time, complying with all required quality standards
  • • ACCIONA Agua, part of the Aguas Tratadas del Valle de México Consortium that will operate the plant for 22 years, also helped to design and construct it


The Atotonilco wastewater treatment plant, designed, built and operated by the Aguas Tratadas del Valle de México (ATVM) Consortium, which includes ACCIONA Agua, has celebrated its first year in operation.

During this time, the plant located in the state of Hidalgo, Mexico, has treated an average flow of 31.5 m3/s, complying with all required effluent quality standards in 100% of the samples taken.

This brings enormous health and safety benefits to the communities that use this water in agriculture, improving the sanitary, epidemiological and health conditions of the end users.

The Atotonilco plant is capable of treating wastewater from 12.6 million people, equivalent to the residents of Mexico City, reusing it for agriculture and irrigation, as well as making it possible to change restricted crops to unrestricted, among other benefits.

The Atotonilco treatment plant also contributes significant environmental benefits to the region, by cleaning up the Tula riverbed and helping to restore the environmental aspects of the Endhó dam.
The water treatment has also improved the health of families working in nearby fields and prevents septic material from building up in irrigation channels.


In 2009, the Mexican Government, through the National Water Commission (CONAGUA), awarded the contract to design, construct, operate and maintain the Atotonilco treatment plant for 22 years to the Aguas Tratadas del Valle de México consortium, comprised of Promotora del Desarrollo de América Latina (IDEAL), ACCIONA Agua, Atlatec, Desarrollo y Construcciones Urbanas (DYCUSA) and Green Gas.

Located in the town of Atotonilco de Tula in the state of Hidalgo, northeast of Mexico City, the project received an investment of approximately €560 million, making it possible to treat 60% of the wastewater generated in Mexico Valley.

The wastewater treatment plant is the largest in the world, with a nominal average treatment capacity of 35 m3/s and a maximum of 50 m3/s, including the final discharge of the solid waste and sludge generated.

The plant is also equipped with a cogeneration system that takes advantage of the biogas produced during digestion, enabling maximum energy savings.


ACCIONA Agua has a consolidated presence in Mexico, with major contracts such as the integral water management contract for Boca del Río, a service that will benefit some 150,000 residents over the next 30 years.

Through this agreement –worth some €800 million– ACCIONA Agua is responsible for providing public drinking water supply and distribution services, operating the sewage system and treating wastewater, as well as managing more than 50,000 service subscribers.

ACCIONA Agua has extensive experience in treating wastewater, providing optimised solutions that cover the entire value chain of a plant, from the design and construction through to the subsequent operation and maintenance.

ACCIONA Agua has treatment plants around the world serving both small towns and large cities. It has built over 300 wastewater treatment plants, with a combined treatment capacity of over 13.5 million m3/day, enough to serve a population of over 55 million.


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