Established in 2001, the departmental groundwater quality monitoring network aims to measure groundwater quality. To date, he has a total of 70 points. Site selection was conducted based on the value of the underground resource, the existence of catchments used for drinking water supply, and known quality issues such as nitrates or pesticides.
Monitoring is carried out twice a year. The network thus complements the monitoring carried out at national level.
The data can be consulted at **[http://odee.herault.fr/index.php/thematiques/eaux-souterraines](http://odee.herault.fr/index.php/thematiques/eaux-souterraines)**
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