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Tests last summer showed troubling levels of lead in the water at Summit Township Elementary School, perched on a quiet hilltop outside Butler, Pa. But for the next five months, no one told the parents of Summit’s 250 students. When officials alerted families to the potential lead contamination in January, the dominoes fell quickly. (Dennis, 4/30)

Last year, with fears about lead poisoning running high in the wake of the water crisis in Flint, Mich., New York City officials said that they had tested the water in all the city’s public schools and that the results should be reassuring: Only 1 percent of outlets had lead levels above the Environmental Protection Agency’s action level of 15 parts per billion. (Taylor, 4/28)