Abstract
During the last decade, with the amelioration of the detection methods and the increasing number of studies on the subject, the isolation of viruses in treated drinking water has been reported more frequently than ever. These reports have in common the very low number of viruses isolated and these viruses are usually found only after concentration procedures involving several hundred liters of water. Our own studies have shown that during the conventional treatment of drinking water 99.998% of the indigenous viruses are removed. The residual viral fraction does not exceed 10 viruses per 1 000 liters of water. Using a probabilistic approach this viral concentration in drinking water is well below any dangerous level of enteric viruses in water and the presence of these viruses should not be considered as a health problem but more as the limit of the water treatment methodology.
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