Stock Photo - 07 June 2021, Bavaria, Moosinning: Werner Baltjan, an employee of the Munich Water Management Office, holds a plummet at a groundwater measuring point to measure the groundwater level. With it, he prepares a sampling in which, among other things, the nitrate content of the groundwater is determined. Photo: Tobias Hase/dpa. - Moosinning/Bavaria/Germany

Stock Photo: 07 June 2021, Bavaria, Moosinning: Werner Baltjan, an employee of the Munich Water Management Office, holds a plummet at a groundwater measuring point to.

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