mold testing and removal
https://getwaterdamagemoldcraft.brightpathdigest.com/posts/understanding-water-damage-mold-remediation-for-your-home
After finding mold in the basement, I called a specialist who used a moisture meter and took air samples to identify the species. The removal involved sealing off the area, scrubbing with biocide, and using HEPA vacuums. It took a few days but it's finally dry and safe.