[The protection of drinking water in a public health department].

The protection of drinking water is a key issue in a Public Health Department's activity. A substantial amount of planning and monitoring work is involved in the development and implementation of a water safety plan, aimed not only at the enforcement of public health regulations, but also at the improvement of the quality water. We provide an overview of the quality monitoring program of the municipality of Prato, a highly populated and industrialized area, where ground water is contaminated by anthropogenic pollutants such as trichloroethylene, tetrachloroethylene and nitrate. We show how, in spite of the intrinsically poor quality of the basic water resource, the careful application of an appropriate prevention plan, with the cooperation of the local water authority, allows the delivery of drinking water of increasing safety and quality.