Iceland's most famous attraction started life as a power plant's wastewater problem
1970s
Formed by accident
1992
Officially founded as a spa
1M+
Visitors per year
2,000m
Depth water is drawn from
The Story
Nobody planned the Blue Lagoon. It exists purely by accident — the byproduct of a geothermal power plant, Svartsengi, built in the 1970s to generate electricity and hot water for the Reykjanes peninsula. As part of normal operations, the plant released its excess heated seawater into the surrounding lava field, expecting it to simply drain away into the porous rock. It didn't. Minerals in the water gradually sealed the lava field's pores, and the runoff started pooling instead — an ever-expanding lagoon that officials, at the time, described not as a landmark but as an environmental problem.
Locals thought differently. Despite skepticism, people started bathing in the strange blue water anyway, and soon those with skin conditions like psoriasis noticed something real: it seemed to help. That discovery is what actually launched the Blue Lagoon as a destination — scientists later confirmed the water's silica, algae, and mineral content had genuine skin benefits. What had been dismissed as industrial runoff became, by 1992, an officially founded spa, and eventually the single most visited attraction in the entire country.
Iceland's most famous tourist site began as something the power company wanted to get rid of.
As You Walk Around
Easy to miss if you're not looking
The power plant is still right there, still operating. Svartsengi hasn't gone anywhere — the lagoon and the plant coexist, with the lagoon continuously fed by the plant's ongoing operations rather than being a fixed, static pool.
The water genuinely comes from 2,000 meters underground, heated to roughly 250°C before it ever reaches the surface — what you're soaking in has traveled an extraordinary distance and temperature range to get to you.
This whole area has been under real volcanic pressure recently. A series of eruptions near Grindavík in the past few years have come close enough to threaten the power plant itself — protective berms have since been built around both the plant and the lagoon facilities.
Fun Trivia
Things most visitors don't know
The lagoon sits inside an 800-year-old lava field. The dark, jagged rock surrounding the milky-blue water erupted long before anyone imagined putting a spa here.
Its earliest visitors had almost nothing to work with. As recently as the early 1990s, the entire "facility" was a simple wooden shed to change in — a far cry from the resort complex it's become.
The color you're soaking in is a side effect, not a design choice. The milky blue comes from suspended silica reflecting sunlight — the same silica that, unprotected, can leave hair feeling stiff afterward (worth remembering the conditioner trick before you get in).