Medical items including, syringes, medical tubing, catheters, specimen bottles and medical waste bags began washing ashore along with larger debris like wooden planks and other trash, said health department officials.
Lifeguards cleared and closed the beaches as crews came in to clean up the mess.
It all appeared to be an isolated incident, said Ocean County health officials.
All the beaches reopened Monday but questions remained about the origination of the medical junk. Authorities want to know if the waste washed up from a landfill or if it was dumped into the ocean.
One theory was that the waste came from a North Jersey landfill after getting washed out by rain storms and currents then carried it down shore to Barnegat Light and points south.
Investigators were also trying to find out who dumped the waste in the first place.
As of Wednesday all beaches remained clear.The New Jersey Department of Environmental Protection was flying over the beaches daily to ensure that no more waste came ashore.