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How high is the nitrate concentration in groundwater (FOEN)

Nitrate is an essential plant nutrient. Nitrate enters groundwater mainly through excess farmyard or mineral fertiliser. According to the Waters Protection Ordinance (WPO), a nitrate concentration of 25 mg/L should not be exceeded in groundwater. Find out where the nitrate concentration in groundwater exceeds the limit throughout the country.

18.05.2021 | www.geo.admin.ch

ch.bafu.naqua-grundwasser_nitrat

Link to the map: map.geo.admin.ch

Nitrate concentrations in groundwater in Switzerland are recorded at national level as part of the NAQUA National Groundwater Monitoring. The National Groundwater Monitoring network comprises more than 500 monitoring sites and is operated by the FOEN in close cooperation with the cantons. The natural state and the influence of human activities on the aquifers typical of Switzerland are monitored. While nitrate exceeds the limit of 25 mg/l in groundwater at almost 15% of all monitoring sites nationwide, concentrations in agricultural areas are above the limit at more than 40% of the monitoring sites.

Further information on the topic of nitrate: Website BAFU

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COGIS (Coordination, Geo-Information and Services)
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3084 Wabern