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Introduction: Considering the geographical location and industrial activities of the county Guano, which lies on an aquifer that supply water for both consumption and crop irrigation, it is necessary to examine the levels of chromium (Cr) in its watershed and tributaries. Objective: To evaluate the amount of Cr existing in the surface waters of the Guano river basin and aquifer. Methods: Several samples of the river and aquifer were taken and the amount of Cr present was measured. Using Z-test, Cr levels found in the water were compared with those recommended as normal by the World Health Organization (WHO), national standards of the Texto Unificado de Legislación Secundaria de Medio Ambiente (TULSMA) and the Servicio Ecuatoriano de Normalización 1108 ( INEN 1108). Results: Relatively high Cr values were found when compared with those established by the WHO. However, they were normal when compared with TULSMA and INEN 1108. Conclusion: The levels of Cr found in the Guano river and the aquifer were higher than those recommended by the WHO. It is recommended to replicate our findings in order to corroborate the results and to take appropriate measures in order to reduce water contamination. Keywords: chromium, water, Guano, Ecuador. Resumen  Introducción: Considerando la ubicación geográfica y actividades industriales del cantón Guano el cual yace sobre un acuífero que sustenta las necesidades de agua tanto para consumo y riego de la población es necesario examinar los niveles de Cromo (Cr) en su vertiente como sus afluentes. Objetivo: Evaluar la cantidad de Cr existente en las aguas superficiales de la cuenca del río Guano y en pequeños ojos de agua provenientes del acuífero. Métodos: Se tomó varias muestras de agua del río y ojos de agua y se midió la cantidad de Cr presente. Por medio de la prueba Z se comparó los niveles de Cr con los recomendados como normales por la Organización Mundial de la Salud (OMS), normas nacionales del Texto Unificado de Legislación Secundaria de Medio Ambiente (TULSMA) y Servicio Ecuatoriano de Normalización 1108 (INEN 1108). Resultados: Se encontró valores relativamente altos de Cr al compararlos con los establecidos por la OMS. Sin embargo, estos se encontraron dentro de rangos normales al compararlos con TULSMA e INEN 1108. Conclusiones: Los niveles de Cr encontrados en el río Guano y ojos de agua del acuífero son superiores a los recomendados por la OMS. Se recomienda replicar los hallazgos para corroborar los resultados y tomar las medidas adecuadas para reducir la contaminación del agua. Palabras clave: cromo, agua, Guano, Ecuador.

Hexavalent Chromium in Waters for Human Consumption and Irrigation in the Guano Canton