Abstract

The general approach to the setting of limits for chemical contaminants of drinking water is considered including the selection of constituents and the toxicological and other information required. In general there is a deficiency of relevant toxicological data but even where good information is available its extrapolation from high to low concentrations and from animal species to man involves considerable uncertainties. The magnitude of these uncertainties has been brought out clearly in the Guidelines for Drinking Water Quality (GDWQ) of the World Health Organization. The use of ‘Guideline Values’ is a sensible alternative to Maximum Acceptable Concentrations and similar limits used in other standards. GDWQ includes Guideline Values for 27 water constituents of concern in relation to health and of these eighteen are organic compounds.

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