Normally, the answer would be no. But in these very limited circumstances, at Iceland’s Blue Lagoon, you can swim in geothermal power plant wastewater, and it’s even healthy: although the marketing material doesn’t usually mention it. Here’s a story about geothermal energy, cheap heat, and how to keep some ducks warm.
rokur
Production engineer and certified swim coach. Full-time IT consultant, spare-time swimming aficionado. 2 sons, 2 daughters and a wife. President of the Faroe Islands Swimming Association. Likes to run :-)