TFA in Switzerland Groundwater

Map of Switzerland with several hundred groundwater sampling points, coloured by TFA concentration: up to 0.5 µg/l (below the limit of quantification), 0.5 to 1 µg/l, 1 to 10 µg/l, and above 10 µg/l. Points between 1 and 10 µg/l cluster across the north and west of the country; one site in the north is above 10 µg/l. Lower values dominate the Alps in the south.