Periodic or continuous surveillance or testing to determine
the level of compliance with statutory requirements and/or
pollutant levels in groundwater.
Groundwater monitoring is the observation of changes in
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the quality and/or quantity of groundwater over a period
of time using continuous or periodic observations at a network
of monitoring locations or strategically-situated measuring
There are many different purposes for monitoring groundwater.
These include determination of compliance with legal requirements,
demonstration that no contamination has occurred, obtaining
an early warning of contamination problems, documention
of drinking water quality or simply the observation of temporal
changes in natural conditions which may have a negative
influence on the water quality.
Monitoring at the regional level (river basin) is described
by the Water Framework Directive. According to this directive,
Member States must establish monitoring programmes to
gain an overview of the water status within each river basin
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