Rural potable water systems benefit some 1.7mn people in the country.
Cash-strapped municipal water companies will get a makeover after congress passed legislation aimed at reorganizing the sector.
The state's water authority, which will continue building a 34km pipeline, says it is managing public funds better.
The system's two existing distribution lines require extensive maintenance work, which will be carried out once the third line is complete.
The project calls for the design and implementation of a monitoring and control system for the aqueduct network of the country's capital.