Number of children per km2 in older primary schools

The map shows the number of children per km2 that attend older primary schools and may therefore be exposed to more lead. Before 1945, lead drinking water pipes were mainly installed in buildings. This has been discontinued since about 1960. The drinking water companies replaced the majority of the outdoor water pipes in the period 1995-2002. Homeowners are responsible for indoor plumbing. In older buildings there is therefore a chance that lead pipes are still present.