WASHINGTON (AP) — A survey of school districts around the country finds that less than half test their water for lead, and among those that do more than a third detected elevated levels of the toxin, according to a federal report released Tuesday.

Lead can cause brain damage and learning disabilities in children.

The report, released by the Government Accountability Office, is based on a survey of 549 school districts across the United States. It estimates that 41 percent of school districts, serving 12 million students, did not test for lead in the water in 2016 and 2017.

Of the 43 percent that did test for lead, about 37 percent reported elevated levels. Sixteen percent of schools said they did not know whether they test for lead, the report says.

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