The partial collapse of a dock once contaminated with uranium into the Detroit River did not put dangerous levels of chemicals into the waterway, according to new test results from a southeast Michigan water utility.
The Great Lakes Water Authority tested both raw and tap water from its intake site near where the dock collapsed.
The dock was used as a storage site for aggregate materials like limestone, but it had used to store components for nuclear weapons in the 1940s and 50s.
The test results show no detectable levels of highly toxic metals like uranium, mercury, thorium and lead.
The tests did detect some traces of other metals. But they were at low enough levels to be considered safe.
The GLWA says it will release test results for possible radioactive isotopes once it receives them. Recent state testing found no dangerous levels of radiation at the site.
This story has been updated to clarify that the site was once contaminated. The U.S. EPA says radiation tests conducted in the past several decades have come back at or below naturally occuring levels.