Dragonfly Mercury Project

Mercury pollution threatens wildlife, fish, and people—but tiny dragonfly larvae can help solve the mystery. The Dragonfly Mercury Project (DMP) is a nationwide citizen science effort where volunteers collect dragonfly larvae from national parks and other protected areas. These larvae are sent to a USGS lab for mercury analysis, helping scientists understand where mercury contamination is highest and how it moves through food webs.

Since 2009, over 8,500 volunteers have helped sample more than 190 parks. Data from the project has informed EPA policy, mapped mercury risk across the U.S., and helped park managers protect ecosystems and visitors. No experience is needed—just curiosity, waders (optional), and a willingness to get a little wet.