Definition:
Introduction of any undesirable foreign substance — physical, chemical or biological — into an ecosystem. Does not imply an effect (see pollution). Contamination is usually anthropogenic (caused by humans), although natural conditions can sometimes generate contamination (ex. arsenic, fluoride).
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
AQUASTAT. 2008. Adapted from Harmoni-CA: Harmonised modelling tools for integrated basin management