contamination

Introduction into water of any undesirable substance not normally present in water, e.g. micro-organisms, chemicals, waste or sewage, which renders the water unfit for its intended use.

Terms of Hydrology

Introduction dans l'eau de substances indésirables qui ne s'y trouvent pas normalement (telles que microorganismes, substances chimiques, déchets, eaux d'égout) et qui rendent l'eau impropre aux usages envisagés.

Terms of Hydrology