What chemical compounds might be present in drinking water?
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# Summary of Section 1

- Drinking water contains a mixture of anions and cations which are monitored and managed to avoid adverse health or environmental effects.
- The toxicity of a chemical to a receptor can be illustrated by a dose-response curve.
- The LD50 is the lethal dose responsible for killing 50% of the receptor population. The LC50 is the analogous lethal concentration.
- Toxicological effects observed in the short-term are termed acute while chronic effects arise from prolonged exposure.
- The lethal dose low (LDLO) is the lowest dose per unit of body weight of a chemical known to have produced death in a particular receptor.
- Tolerable daily intake or guideline values are often set for chemicals in drinking water.

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