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. Sources: https://www.c40.org/case_studies/the-worlds-largest-geothermal-heating-system-saves-up-to-4m-tons-co2-annually https://www.verkis.com/projects/utilities/water-supply-systems/nr/982 https://nea.is/geothermal/direct-utilization/heat-pumps/ https://icelandmag.is/article/nine-fascinating-facts-about-geothermal-energy-and-reykjavik https://askjaenergy.com/iceland-renewable-energy-sources/geothermal-different-utilization/ https://nautholsvik.is/en/ https://perlan.is/about-perlan/ https://www.epa.gov/coalash/coal-ash-basics Research on Blue Lagoon and a skin condition: https://doi.org/10.1016/S0738-081X(96)00099-5 Filmed safely: https://www.tomscott.com/safe/ 🟥 MORE FROM TOM: https://www.tomscott.com/ (you can find contact details and social links there too) 📰 WEEKLY NEWSLETTER with good stuff from the rest of the internet: https://www.tomscott.com/newsletter/ ❓ LATERAL, free weekly podcast: https://lateralcast.com/ null ➕ TOM SCOTT PLUS: null 👥 THE TECHNICAL DIFFICULTIES: null