If you’re an open water athlete competing in Rio right now, I’m going to assume you’re keeping your mouth well and truly shut, quite literally. Why? A report commissioned by the Associated Press revealed that open water in Rio’s Olympic venues holds viral levels 1.7 million times what would be considered alarming in the United States and Europe.

Much of the water used is contaminated with raw human sewage, meaning sailers, swimmers, canoeists, and rowers alike only need to ingest three teaspoons of water in order to be certain of getting sick.pollution-rio