Preliminary study of selected drinking water samples in Mexico City
1997
Bonilla , Patricia | Castro , Teresa | Gaytán , Martha | Lugo , Alfonso | Vilaclara , Gloria
Mexico City is a critica1 example of drinking water supply and pollution, dueto its population of nineteen million within a closed basin, 2300 m above sea level. The increasing urbanization has diminished the rate of aquifer reload, and a large amount of water is brought fiom lower and more distant zones, with increased energetic and ecological costs. To obtain data about drinking water at selected points in the city, 63 locations were sampled from April to Deceniber in 1989 (209 total samples). Where available, samples were taken from municipal network intakes, cistems, roof tanks and kitchen tap water. At least one location was tested in 24 ofthe 27 Municipal Districts in tlie city. Measured pliysico-cliemical parameters were: temperature, pH, alkalinity, hardness, chloride, sulfate, silica, total solids, suspended solids and conductivity (K,,). Biological analysis were total and faecal coliforms, and faecal streptococci. Based on principal component analysis ordination, data were arranged into six groups of water quality. Drinking water quality at the municipal network intakes was good in 53% of the cases, although pollution was detected when water was distributed by tank tmcks, when it carne from local wells in-the State of Mexico, or when water had a high suspended solids content. Drinking water was often polluted inside tlie houses due to poor domestic handling.
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