INDIANAPOLIS (AP) — An analysis shows that the water system for a western Indiana high school is among nearly 40 in the state that have exceeded federally allowable lead levels at least once since the start of 2013.

The heightened lead levels in the water systems for North Vermillion High School and Baugo Community Schools, in the northern Indiana city of Elkhart, are troubling because of lead’s harmful effects on children.

An Associated Press analysis of Environmental Protection Agency data shows that lead levels exceeded the government’s allowable level at least once in 38 Indiana water systems since 2013.

North Vermillion interim superintendent Bruce Hatton said crews have replaced water lines and taken other steps that reduced lead levels. Baugo Community Schools officials weren’t available to comment because of the district’s spring break.