sewer backup safety 9
https://getsewagecleanupstlouistips.greyhavendaily.com/posts/is-it-safe-to-stay-home-after-a-sewage-backup-a-guide-for-st.-louis-homeowners
If your sewer backs up, don't panic. Avoid flushing anything and stay out of flooded areas—raw sewage contains harmful bacteria. Turn off your water main to stop flow, then call a plumber. Wear rubber gloves and boots if cleanup must happen, and never mix bleach with other household cleaners.