KSTP News in Minnesota found that school officials across Minnesota are not following the state’s recommendations to test for lead in school water systems at least once every five years.

Although these are recommendations and not regulations, a leading authority on lead amounts in water said that this issue was a critical health concern for Minnesota students.

KSTP found that children in some districts have been exposed to lead levels up to 942 parts per billion (ppb). The American Academy of Pediatrics recently said that school water fountains should not exceed water lead concentrations of more than 1 ppb.