Researchers say analysis has found human waste was part of stinky muck that collected in 2011 along the Lake St. Clair seawalls of some homes in St. Clair Shores.

The Macomb Daily of Mount Clemens reports the results of DNA analysis were discussed Wednesday night in Macomb County's Harrison Township. Researchers say the muck contained bacteria. Similar muck has been found in other Michigan waters, including Saginaw Bay and Grand Traverse Bay.

Initial tests found that the material was made up of algae that may have been compounded by storm water runoff, municipal wastewater discharge and zebra mussels.

The muck was reported as a problem in 2011. Officials got in touch with the state about how to address the problem and Michigan State University researchers did more tests.