The controversial law, which allowed private sector participation in the provision of water services, had been passed by congress in late December.
The agency will go to the arbitration tribunal with the aim of nullifying the Ruta del Sol 2 highway contract with the Brazilian construction giant.
Use of technology to improve efficiency and reduce costs is one of the main aims of João Dória, mayor-elect of the Brazilian city, who has created a specific department to manage this topic.
High-level officials from the Brazilian state met with executives in Portugal and Germany with the goal of securing financing for several infrastructure projects.
Mexico's water regulator has told debt-ridden Abengoa to rapidly resume works on the delayed project or sell the concession to another firm, reports a local daily.
The contract for the metro line project was awarded on condition that the building consortium would be in charge of securing the required financing.
The government said investments in several infrastructure projects partially helped Mexico to once again become one of the 10 countries in the world with most international visitors.
Legislators drafting the city's new constitution voted in favor of maintaining the public status of the provision of water services.