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Groundwater Quality Update for the Canton of Basel-Stadt (2025-02-05)

Published: October 22, 2025  ·  Period: 2025-02-05

The recent groundwater sampling campaign collected 78 samples from various stations, revealing several parameters outside expected ranges, including high turbidity and low oxygen saturation, which are typical in untreated groundwater, but the solvent odor at station F_1520 suggests potential contamination that warrants further investigation. It is important to monitor parameters that show deterioration compared to previous data to identify emerging issues.

The groundwater sampling campaign took place recently, involving a total of 78 samples collected from various monitoring stations. The campaign covered a number of parameters to assess the water quality across different locations. The data gathered provides insights into the current state of the groundwater in the monitored areas.

Several parameters were found to be outside the expected ranges. At station F1045, the parameter "Niederschlag(Farbe)" was recorded as "rot," deviating from the expected "neg." Additionally, the turbidity at this station was measured at 2, which is higher than the expected value of 1. At station F1097, the oxygen saturation was notably low at 1.30%, below the expected threshold of 50%. Furthermore, station F1520 reported a "Geruchsart" of "Lösungsmittel," which is not the expected "neg."

Deviations from drinking-water standards are common in untreated groundwater and should be interpreted in context. Low oxygen concentrations, such as those observed at station F1097, are typical in deep groundwater due to oxygen consumption during long subsurface travel. However, the presence of solvent odors at station F1520 may indicate contamination and should be further investigated. It is crucial to focus on parameters that show clear deterioration compared to previous sampling rounds, as these may signal emerging issues that require attention.

Data source: Umweltanalyse Grundwasser
Additional resources: AUE BS, Oberflächengewässer und Fischerei

🤖 This text was generated with the assistance of AI. All quantitative statements are derived directly from the dataset listed under Data Source.