He has tried to restore some of the prairies, but Westcave Preserve itself hasn't really dealt with it. However, it is in the process. Of course, today, it is worse than it has been because more people drive by Westcave and more people are moving to the Texas Hill Country. Although the NPS from automobiles cannot be prevented, we should always try to find ways to lessen its effects. Evidently herbicides don't pose that much of a threat to the preserve though herbicides find their way into Westcave through the watershed.
Any contamination is a potential hazard.
They mostly come from ranchers and homeowners, and if used properly, they won't necessarily harm wildlife. Upstream At Westcave the main point source pollution is strong chemicals from many different things. The emu ranchers upstream used to be one of the main contributors to the amount of pollution, but they aren't there anymore. Now the thing that causes the most pollution is sewage and chemicals. All the neighboring places know about Westcave.