Palabras clave: monitoreo ambiental, decisiones ambientales, contradicción social, biomonitores aBstract Various environmental protocols only consider the quality standards to the maximum permissible limits and the concentration, whether on parameters or elements and other standardized protocols using organisms as bioassays and toxicity indexes. However, the effects and impacts that have occurred over time through the interaction between parameters, concentrations and organisms are complex due to their limitations based on monitoring programs. The purpose of the study was to analyze the contradiction not incorporated in environmental protocols on historical monitoring with aquatic biomonitors as a social problem. Any understanding of damage caused to aquatic populations should be supported by early signals of analytical prediction and where biomarkers in biomonitors represent excellent tools in decision making.