The Matanza-Riachuelo river (MR), a tributary of the Río de la Plata (La Plata River), is the most contaminated river basin in Argentina and considered one of the most polluted water bodies in the world.
The 1992 Buenos Aires water concession was meant to attract private companies who could bring the needed infrastructure and service upgrades,however, growth of service networks has been lower than planned, particularly in low-income sectors of metropolitan Buenos Aires [REF].