Sens communSubstance which, at certain concentrations in water, presents a risk to public health, animal health or living beings and ecosystems in general. Certain substances and their effects are relatively well identified (heavy metals, some micro-pollutants). For others, the risk to public health and ecosystems is difficult to assess, thus deeming it prudent to use the precautionary principle. We then speak of "toxic risk".
According to the Ministry for the Environment and AFB
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