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The net water supply refers to water employed by the man for various uses including agriculture, industry, domestic and recreation; in Colombia, is defined by Resolution 0865 of 2004 the Ministry of Environment, Housing and Territorial Development, where supply surface use two different reduction factors: 25% for environmental flow and 25% for water quality. The application of these two reductions is limited in most cases, applying these percentages to the lowest average monthly flow multiyear, therefore, quality studies are not directly included in this calculation. This paper presents the methodology for calculate the reduction for water quality, from the identification of appropriate quality and pollution, ICA, ICO, using information from two sub-basin tributaries of the Cauca river basin: Hondo river and Zanjón Oscuro, located in the upper Cauca River basin, finding a direct relationship between the reduction and water pollution. [ABSTRACT FROM AUTHOR]