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An internationally-recognized environmental health expert says the Boise School District is taking the right first steps to purge lead from school water sources – but that more needs to be done to protect the health of students and staff.

Paul Sancya / AP

After detecting lead in water at one Boise school last month, district officials ordered a widespread test of all schools that could also be contaminated. About one in six samples tested above federal guidelines for lead found in drinking water across 26 active schools built before 1986 – the year Congress outlawed lead pipes in new construction nationwide.