Uranium is – in addition to its radioactivity – a strong kidney toxicant and since 2011, a toxicologically justified regulatory limit for drinking water was established. In a study for the State Environmental Agency of Bavaria (LfU Bayern) in 2011 it was shown that local high uranium contents in groundwater in the Lech Valley originate from lowland fen soils. Uranium is released from these triggered by agricultural measures – peat decomposition by drainage and nitrate input.