Wildfire ash turns Spanish mountain river black, contaminating water supply | Reuters, October 7, 2026 A river running through a town in central Spain has turned black from wildfire ash and debris, contaminating the local drinking ​water and forcing residents to rely on emergency supplies. https://www.reuters.com/business/environment/wildfire-ash-turns-spanish-mountain-river-black-contaminating-water-supply-2026-10-07/