The most iconic features, like Old Faithful, have neutral to alkaline pH. Some Yellowstone features, however, can be acidic enough to break down the very rock that hosts them!
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Yellowstone National Park isn't exactly known for its swimming holes. Due to the thermal activity in the park, most rivers and lakes in Yellowstone are closed to swimmers. However, if you're up for an adventure, the park has opened up a few alluring areas to the public.
The water in Yellowstone looks pristine and clear, but don't be fooled to think that it is clean and safe to drink on it's own. Because of the park's immense wildlife populations, there are animals constantly drinking, defecating and dying in and around these waters.
Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features. More than 20 people have died from intentionally entering or falling into hot springs.
But Yellowstone's thermal features don't flow cold water like you're used to. Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features.
The parks' geyers and springs are acidic because they are fed by thermal water deep underground that picks up sulfuric acid as it rises to the surface. The sulfuric acid is produced by microorganisms that break down hydrogen sulfide in rocks and soil.
If you plan to do any water activities while at your stay water shoes are a must. Activities could include swimming in the Boiling River in Yellowstone, rafting in Glacier, or kayaking on the many lakes in the area. Make sure your water shoes are secure and won't fall off (flip-flops are not recommended).
If you do any hiking or camping in Yellowstone, you SHOULD bring bear spray. Generally, you don't need bear spray when visiting the popular and crowded geyser areas and villages, such as Old Faithful and Canyon Village.
The water in Yellowstone looks pristine and clear, but don't be fooled to think that it is clean and safe to drink on it's own. Because of the park's immense wildlife populations, there are animals constantly drinking, defecating and dying in and around these waters.
The center of the pool is sterile due to extreme heat. “The deep blue color of the water in the center of the pool results from the intrinsic blue color of water, itself the result of water's selective absorption of red wavelengths of visible light.
The hot springs within Yellowstone are far too hot to enjoy. Even a dip of a tow could result in serious burns. Please pay attention to signage and do not touch the scalding waters of Yellowstone. There are a few places where hot waters flow into cool rivers, making a warm area to swim and soak.