Abstract
Sanitary taps and to the lesser extent also other metal products situated at the end of plumbing are the most common sources of nickel in drinking water. For this reason and because of various water stagnation times, the concentration of nickel in one sampling point can vary within range of several orders of magnitude and after stagnation may reach peak values up to 500 µg/l, i.e. more than 20 times higher than current limit value (20 µg/l).
Such single oral nickel dose can provoke manifestation of systemic contact dermatitis in some nickel-sensitive individuals, which represent about 5 % of population.