Variación de la calidad del agua de La Ciénega de Tláhuac, México

At present, domestic and farming activities take place along its margins of the Cienega de Tlahuac and affect the water through runoff. In view of this, the study evaluated the water quality and compared it to data which was published 20 years ago. The results showed a high conductivity due to surrounding farming runoff rich in fertilizers, hard water with a high sulfate content, an alkaline pH, an oxygen content that varied from anoxia or hypoxia to oversaturation, a hypereutrophication due to high levels of total nitrogen and phosphorus, and contamination due to fecal coliform bacteria. These data are higher than those of 20 years ago and indicate a bad water quality, particularly hypereutrophic.