Is Yosemite water clean?

Viruses aren't common in Yosemite's waters, but we recommend that you treat water to kill them.



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Water quality throughout Yosemite National Park is considered to be good and is generally above state and federal standards.

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Yosemite National Park offers a range of swimming opportunities—from rivers and lakes to our family-friendly pools, which are the only swimming places in Yosemite with lifeguards. River and lake swimming is at-your-own-risk. Life jackets are strongly recommended—especially for children.

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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.

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Showers are available at the Curry Village pool showerhouse for a fee. Showers are not available elsewhere in the park. Dump stations are available at Upper Pines Campground (all year), near Wawona Campground (summer only), and near Tuolumne Meadows Campground (summer only).

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Minimal light pollution makes Yosemite Valley a perfect place for stargazing! Your naturalist will use a laser pointer to single out specific stars, planets, and constellations.

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Stay away from river and creek banks during high water conditions and avoid rock hopping. Stream polished rocks along the water's edge may be slippery when wet or dry. If you choose to cross a stream without a bridge, avoid deep and/or swift water.

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The risk for mosquito activity is extremely high. Wear long-sleeved shirts and pants when spending time outdoors to prevent bites.

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Even if you don't plan on hiking across any streams or rivers, waterproof hiking shoes are a great comfort in Yosemite. As we have mentioned, springtime signals the melting of snow and this causes many trails in Yosemite to have patches of water and ice.

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Yosemite's largest waterfalls flow from October or November through July, but tend to peak in April and May and into June, with some falls (including the park's signature Yosemite Falls) running dry by late summer.

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The Upper Yosemite Fall drops 1,430 feet (436 metres) and the Lower 320 feet (98 metres), with a series of cascades between; the total drop is 2,425 feet (740 metres), creating one of the world's highest cataracts, the highest in North America.

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The name Yosemite is simply a corruption of the term which the southern Miwoks applied to any species of bear and particularly to the grizzly,2 and was given to the valley, as we shall see, because the white people who first came in contact with its native inhabitants called them Yosemites.

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No matter which season you are planning to visit Yosemite, layers will be important. During the spring, summer, or fall, we recommend wearing a base of shorts and a tank top or t-shirt then layering from there. Cargo pants that have removable sections are great.

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16 Big mistakes to avoid in Yosemite National Park
  • 1 - Arriving without a plan! ...
  • 2 - Giving yourself just a day. ...
  • 3 - Thinking the waterfalls are flowing all year round. ...
  • 4 - Heading to Glacier Point for Sunset. ...
  • 5 - Visiting Tunnel View in the middle of the day. ...
  • 6 - Avoiding the epic hikes. ...
  • 7 - Arriving at midday.


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Lodging options inside Yosemite National Park are managed by Yosemite Hospitality, and range from simple tent cabins at the High Sierra Camps to deluxe rooms at The Ahwahnee. Reservations are available 366 days in advance and are strongly recommended, especially from spring through fall and during holidays.

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