Boundaries can be very important. Let's just think of child-rearing, partnerships or our own limits that we would never exceed. Certain limits must also be met in water, for example when it comes to the concentration of pollutants or other pollutants in drinking water. The THRESHOLD provides an overview of this. For example, according to the German Drinking Water Ordinance, Schmermetall only contains 0.01 mg of lead in one liter of water.