NEWARK -- Eight facilities used by the city's public school district and its charter schools showed lead amounts in water above the so-called action level set by the U.S. Environmental Protection Agency, according to test results released by the district Thursday night.

Levels of lead beyond the recommended threshold of 15.5 parts per billion were found in sources that included utility sinks as well as sources of drinking water. The results announced Thursday were from schools as well as facilities used less intensively by students, including a transportation hub and athletic fields.

Thursday's results come a few weeks after the district announced elevated levels had been found at 30 schools in the district, touching off widespread concern among parents and immediately drawing comparisons to the city of Flint, Mich., where potentially dangerous levels of the metal were found in the public water supply. Officials in Newark have said elevated lead levels have not been detected in the city supply here.

Exposure to excessive lead has been linked to developmental problems in children, among other effects.

All told, 324 samples taken in Newark March 19 were tested by four state-approved labs. Of those, 76 results were above the action level, meaning additional monitoring and testing are required, along with, potentially, remediation of sites.

Following are the locations where elevated lead levels were found:

Alexander Annex/Boylan Transportation hub, 48.7 percent of all samples taken had elevated lead: 11 percent of drinking water samples and 37.7 percent of non-drinking water sources

KIPP Life Academy, 11.9 percent of samples had elevated lead, all from non-drinking sources

Paulo Freire Charter, 25 percent of samples taken had elevated lead: 2 percent from drinking sources and 23 percent from non-drinking sources

Newark Legacy Charter, 14.9 percent of all samples taken had elevated lead: 8.8 percent from drinking water and 6.1 percent from non-drinking sources

Marion Bolden Student Center, 24 percent of all samples had elevated lead, all from non-drinking sources

Newark School Stadium (not currently in use), 19.2 percent of samples taken had elevated lead, all from non-drinking sources

Unterman Field (currently not in use), 39 percent of all samples had elevated lead, all from non-drinking sources

West Side Park (building leased by district), 45.5 percent of all samples taken had elated lead, 9.1 percent from drinking sources, 36.4 percent from non-drinking sources

The district previously released testing results from 2012 through 2015.

Use the search tool below to find your local schools.

Click to see graphic in mobile app

Paul Milo may be reached at pmilo@njadvancemedia.com. Follow him on Twitter@PaulMilo2. Find NJ.com on Facebook.