Requires posting of signs warning of presence of, and potential danger caused by, duckweed on water bodies in public parks.

This bill requires New Jersey's Department of Environmental Protection (DEP), counties, and municipalities to annually inspect all ponds, lakes, and water bodies in public parks for duckweed - a small floating plant that appears solid but can cause falls. If duckweed is found, they must post clear warning signs at the water body. The DEP must also create educational materials about identifying duckweed and provide pre-approved warning signs to local governments upon request. The law applies to all public parks, including state parks and local municipal areas.