Guessing it had to do with this. They posted a few hours before that
That they were shutting down the water system to do repairs. I am guessing they use chlorine to treat water and soemthing happened
🚨 Important Water Update for Grand Canyon Hikers 🚨
â›” Water Shutoff Notice: Starting today, Wednesday, January 15, through 5 PM on Sunday, January 19, the Transcanyon Waterline will be shut off for construction of a temporary water bypass along the River Trail.