MARQUETTE, Mich. (AP) — A school district in Michigan's Upper Peninsula says it's replacing several drinking fountains after tests found elevated levels of lead in water at some of its buildings.

Marquette Area Public Schools this week issued an update after initial tests came back in July .

The district had samples tested in part because of similar issues reported at Northern Michigan University and concern for the safety of students and employees.

Lead levels above a recommended threshold were found in some drinking fountains, classroom sinks, custodial sinks and other water sources. School starts in September and the district says drinking water is safe at all schools.

Officials say some affected drinking fountains that aren't in high-use areas will be disabled or turned off. Signs about safe drinking water also will be put up.