Tests that showed elevated levels of lead and copper in an Ohio town’s water supply has led officials to close schools Monday and order another round of inspections.

The city manager of Sebring, a small town of some 4,000 people located about 60 miles south of Cleveland, issued an advisory Thursday night warning children and pregnant women to avoid drinking the village system’s tap water after seven of 20 homes showed levels of copper and lead beyond US Environmental Protection Agency (EPA) standards.

The warning comes as neighboring Michigan grapples with a lead-poisoning crisis in Flint – a disaster that experts say underscores the growing need for investment and innovation in the nation’s aging infrastructure. A weakened economy and the passage of time have made repair and replacement of old pipes a challenge, and have led to higher costs and a decline in water quality, especially in many older cities.