The main source of elevated lead levels in potable water is lead piping within the building or piping leading to the building's water supply connection. Lead piping is known to have been sporadically installed in some of the Federal States until the beginning of 1970's. As of 01.12.2013 the Potable Water Ordinance (Trinkwasserverordnung) requires lead levels of less than 10 µg/l for water tapped from household fixtures. In practice this value cannot be met when lead piping exists with the building. According to the Trinkwasserverordnung the owner or operator of the building is responsible for complying with the set limits.
As lead is relatively soft lead piping is usually slightly bent. This picture shows a lead pipe in the cellar running along the ceiling above the corridor entrance.
Water supply pipe made of lead attached to a cellar wall. It is slightly bent and painted white. Lead surfaces may be easily cut with a penknife.