3. Contaminated water
While you might not think of whipworm when listing out more common waterborne illnesses such as cholera, there are many cases of this parasite spreading through water. This usually occurs when soil or fertilizer is first contaminated. If there is a nearby stream then the whipworm eggs contained in the soil or fertilizer may get carried down and spread into larger bodies of water.
Even lakes could serve as a reservoir for the whipworm eggs. When someone drinks this water or even washes their face in it, they could swallow the whipworm eggs. This is just another reminder of why you should never interact with streams of water in the wild. They could be packed with parasites, bacteria, and even toxic algae. If you want to avoid whipworm and other threats then stick to purified water for all your hydration needs.