. Conclusions
With a few exceptions (Fe and Mn), the current concentrations of
metals in samples of water collected in study area were generally in accordance
to the quality standards set by national and international
guidelines. The health risk assessments like HQ and HI indices indicated
that the drinking water would be safe for human consumption. The statistical
analysis provided powerful basis for identification and classification
of various sources of trace elements. Glyphosate levels found were
above the limits for human consumption except in the San Antonio
River during extreme floods. In this case, the glyphosate could present
a low risk for children. Here, the concentration of fecal coliform was
above the national and international recommended maximum levels
established in all sites (Fig. 2). The water from the studied streams
and rivers is not recommended for direct human consumption