Back when I lived in Missouri ten years ago or so, there was a Rainbow gathering at one of the local national parks. A lot of them became very ill because they used the bathroom upstream from where they camped. You couldn't pay me enough to step foot in a park when these are held.
When these hippies are wacked out on their drugs, they will drink from the streams downstream from their toilets.
They use the forest generally as a toilet and a dump.