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Risk assessment combined effects of individual substances in drinking water : Dutch drinking water measurements 1996-2008

Risicobeoordeling gecombineerde effecten van individuele stoffen in drinkwater : Meetdata Nederlands drinkwater 1996-2008

Synopsis

Residuals of chemicals like pharmaceuticals can be present in drinking water in the Netherlands. The amount of each substance is very low which means there is no risk expected for public health at the level of individual substances. Even if the calculated risks of the substances are added together (mixture toxicity) consumption of drinking water shows no risk. This is concluded in the first tentative study by RIVM. This research is done because human health risks were possibly be expected from the combined effects of detected individual substances in drinking water.

Combined health risks
Drinking water suppliers perform analyses in the source surface water on more than a hundred substances. In this project data of measurements are used from the period 1996 - 2008. Future developments like climate change are not considered in this study. The average amount of detected substances in finished drinking water was 2 - 9 in an individual year. For these calculations the most adverse scenario is chosen which means that all detected substances are present at the same time. To get more certainty on the results it is advised to do the calculations once more with more recent data and for more production locations.

Two individual substances notified
 

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