The permissible limit of lead in the water supply is 0.05 milligrams per liter, according to the Norm ITINTEC. In January 2014, the concentration of minerals in water treatment facilities of SEDAPAL was 0.051 iron, 0.005 lead, 0.0012 cadmium and 0.0810 aluminum. These values increased 15.9% and 33.3% in iron and cadmium with respect to January 2013 and a decrease of 16.7% and 12.4% in lead and aluminum. The values are within the recommended limits.