There is a great problem for the supply of drinking water in Mexico, the state of Zacatecas is no exception, in addition to this the water in the region has the presence of heavy metals, fluorine compounds, arsenic and high hardness. The objective of this work is to remove the arsenic present in the drinking water of the municipality of Ojocaliente, Zac. using chitosan gel beads. The initial sample was characterized giving an As concentration of 70 ppb, a high value in reference to the Official Mexican Standard NOM-127-SSA1-1994 for water for human consumption. A series of experiments were carried out at different concentrations, using drinking water sampled in Ojocaliente, Zac., The operation was in batches at an average temperature of 19 ° C and 250 rpm, in aliquots of 50 ml and 0.3 g of gel chitosan beads. The isotherm and kinetics model that fit the data was determined, being Langmuir and Pseudo first order, respectively, and 20% of the arsenic present in the water was removed in a separation step.