Caffeine concentration in the water is a good indicator of pollution from the sewers, a study done Canadian researchers claimed. Professor Sébastien Sauvé and his fellow researchers at the University of Montreal discovered that the amount of fecal coliforms such as E. coli bacteria in the water correlates strongly with the concentration of caffeine in the water. Though the water samples contained other chemicals like Carbamazepine, caffeine showed the strongest correlation. Since caffeine is only discharged by people, it is a sure fire way of detecting domestic water pollution.
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