Hydrocerussite

Lead service line with litharge hydrocerussite (white) overlain by a thin layer of the Pb^IV oxide plattnerite, now largely flaked off. The friable nature of the plattnerite suggests it could be a source of particulate Pb at the tap. The hydrocerussite layer contains abundant diatom frustules, which came from surface reservoirs supplying the distribution system, utility 12.

free use with attribution: JB Maynard 2010