Contaminant hydrology
The study of the environmental fate and transport of antropogenic 
chemicals in groundwater
The further description describes typical groundwater 
pollutants, their causes and the significance to groundwater.


The risk presented by a pollutant relates not only to its
use but also the method of entry into groundwater, its toxicity
(impact or harm) and persistence (including the ability
to degrade naturally, our ability to detect it, and statutory
requirements.

The Groundwater Directive identifies two lists (I and
II) of the most dangerous substances that present a risk
to groundwater and these are subject to a variety of controls.
In contrast the Water Framework Directive defines a pollutant
as any substance that is liable to cause pollution and hence
is wider in scope. The WFD also defines list of Priority and
Priority Hazardous Substances that are regarded as the
most serious threats to water pollution and on which strict
controls on emissions are to be introduced.
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