Water authority Conagua will carry out an analysis to determine if there is any liability on the part of those responsible for the maintenance failure that led to the longest-ever water cuts in the Mexican capital.
Normal service is now expected by Thursday.
The US$500mn project won't be fully finished until next year. Works are three years behind schedule.
Service will be cut from October 31 to November 3 and affect 3.84mn residents of Mexico's capital.