Dissolved trace elements, including iron and manganese, are often an important factor in use of ground water for drinking-water supplies. Concentrations of these trace elements can very over several orders of magnitude across local well networks as well as across regions of the United States.

This volume describes the methods used in the surveillance of drinking water quality in the light of the special problems of small-community supplies, particularly in developing countries, and outlines the strategies necessary to ensure that surveillance is effective.