March 3, 2026
Acid reflux, but make it Yellowstone
The largest acidic geyser has been putting on quite a show
Yellowstone’s “vinegar geyser” is back—and commenters can’t decide if it’s epic or ominous
TLDR: Echinus Geyser in Yellowstone is erupting again, showing off the world’s biggest “vinegar geyser.” Commenters split between awe and doomsday jokes, with one sharing the USGS updates link; the consensus: it’s a rare, normal show worth watching, not a warning siren.
Echinus Geyser, the world’s largest acidic geyser in Yellowstone’s super-hot Norris Geyser Basin, is bubbling again—and the internet is buzzing. The science says its “acid” is more like orange juice or vinegar, not sci‑fi slime, but that didn’t stop a showdown in the comments. Hype squad cheered the comeback (“nature’s metal concert!”), while doomscrollers asked if this meant the park’s infamous volcano was waking up. Meanwhile, practical folks cracked safety jokes—“Do not baptize your GoPro”—and asked where to get official updates. One helpful user dropped the USGS’s live volcano and seismic updates, which instantly became the thread’s most-clicked link.
The geyser sits just a short walk from Steamboat Geyser (the tallest active geyser on Earth), and longtime visitors remembered those extra benches and platforms—proof that Echinus used to put on regular shows back in the day. Now that it’s back for now, the debate got spicy: thrill-seekers want front-row seats, armchair geologists say this is normal Yellowstone chaos, and meme-makers crowned it the “world’s spiciest hot tub.” Scientists explained acidic geysers are rare because acid usually eats the plumbing, but Echinus is a special mix that doesn’t melt the rocks. Translation: big drama online, steady science on the boardwalk.
Key Points
- •Echinus Geyser in Yellowstone’s Norris Geyser Basin has recently become active again.
- •It is the world’s largest acidic geyser, with acidity comparable to orange juice or vinegar.
- •Echinus’s acidity arises from mixing of acidic gases with neutral waters, not strong enough to erode its plumbing.
- •The geyser’s pool is about 20 meters across and ~200 meters from Steamboat apl Geyser; red rims reflect iron, aluminum, and arsenic.
- •Historically, it was mostly dormant before 1948, erupted every 40–80 minutes in the 1970s, and was a consistent performer through the late 20th century.