Limnologists don’t risk their lives like say, Border Patrol Agents, Oil Rig Workers, or Editors (you have no idea how scary some writers can be after you hand back their stuff that you’ve edited; ego clashing that makes a noise loud enough to warrant a trip to the audiologist).
The dangers associated with limnology are pretty minimal, but you will be exposing yourself to various plants, animals, chemicals, such as phosphates, and lots and lots of water. And since your feet will probably get wet—a lot—pruny feet are no fun, and neither are calluses, blisters, fungal infections, and let’s not forget trench foot. (Remember what your mom told you about trench mouth and drinking fountains? Apparently it’s a real disorder and not limited to the mouth.)