Do you need a water filter for Yosemite?

Merced River water is available up to Little Yosemite Valley, however you should treat this water by boiling, using iodine, or using a giardia-rated water filter. Drinking untreated river water may cause significant illness.



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Our water is perfectly safe to drink, bath and swim in, but we recommend that you bring bottled water for drinking, due to the fact that our water has a high mineral content.

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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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Besides the outdoor pools available to the public during summer at Curry Village and Yosemite Valley Lodge, swimming is generally permitted in all bodies of water in the park.

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

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If you're using a reusable water bottle, you can find free water refill stations throughout Yosemite Valley. Yosemite is generally sunny year-round. Daytime temperatures can reach 100°F with a UV Index up to 11 during the summer.

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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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May through September is the most popular time in Yosemite These months correspond with the best weather and are also when all the roads, trails, lodging, shuttles and attractions in the park are open. That includes its most famous drive, Tioga Rd, a 64-mile-long scenic byway that closes when the snow begins to fall.

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