Water service to a Chicago public school has been cut after tests revealed an elevated lead level.

Officials said Friday that water coolers have been delivered to Tanner Elementary School in the South Side Grand Crossing neighborhood.

The lead was discovered as the district tested water at 32 Chicago schools. Lead was found in the water of six schools at levels below Environmental Protection Agency standards. Testing will now be done at 250 additional schools, most built before 1986.

Chicago Public Schools CEO Forrest Claypool says the districtwide testing was being done in "an abundance of caution."

Concern about lead in drinking water increased this year after the discovery of elevated lead levels in Flint, Michigan, water.