Well, I don't live there (yet), but I have observed fuel spills on the river as well as numerous dead fish. It is a fact that there is a sewage treatment plant up river and I would never swim in that "river come down" water. (In fact, even if the water appears crystal clear it could still be contaminated with any number of things.) River clean up and sewage plant monitoring are necessary. Is there any testing of the water that is ongoing? Heavy rains + high season tourists = more monitoring. run gone to do more research....