Inland waters, particularly rivers and lakes are a natural and essential resource for its importance in the continuity of life. In recent years the ecological status in some of the basing of La Libertad region have been affected due to the expansion of the agricultural frontier, increasing human population and mining development, have increased pressure on these ecosystems and the impact on water quality; thus the water ecological status was determined using physicochemical and biological parameters (benthic diatoms) in the basins of the Perejil, Chuyuhual and Caballo Moro rivers; the study was conducted during the months of July and October of 2015, were evaluated in 19 sampling stations (dry and wet season). The biological samples obtained were processed in the laboratory of Botany of the UNT for and identification and counting, the diversity index Shannon & Wiener index (H') and quali...