In general, most schools do not have lead service lines. The source of lead in schools tends to be from brass, because until 2014 even lead-free brass had 8% lead. It's often a tin-lead solder combination from pre-1990 construction, but we've also seen an increase in lead concentrations in newly constructed schools. In general, any metal that's exposed to water for the first time will have a higher tendency to leach if the water is aggressive. Again, the importance of corrosion control is fundamental, particularly when it comes to schools and larger institutions.
On November 23rd, 2017. See this statement in context.